From: Andrew Engelbrecht Date: Thu, 14 Mar 2019 19:58:26 +0000 (-0400) Subject: LibreJS: match version of Lodash we're using X-Git-Url: https://vcs.fsf.org/?a=commitdiff_plain;h=362143c75d006127bc71f86e0b845fab23931ef1;p=libreplanet-static.git LibreJS: match version of Lodash we're using --- diff --git a/2019/assets/js/lodash.js b/2019/assets/js/lodash.js index cab4e798..5b379036 100644 --- a/2019/assets/js/lodash.js +++ b/2019/assets/js/lodash.js @@ -1,14163 +1,6750 @@ /** * @license - * lodash 4.6.1 (Custom Build) - * Build: `lodash -o ./dist/lodash.js` - * Copyright 2012-2016 The Dojo Foundation - * Based on Underscore.js 1.8.3 - * Copyright 2009-2016 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors - * Available under MIT license + * Lo-Dash 2.4.1 + * Copyright 2012-2013 The Dojo Foundation + * Based on Underscore.js 1.5.2 + * Copyright 2009-2013 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors + * Available under MIT license */ ;(function() { - /** Used as a safe reference for `undefined` in pre-ES5 environments. */ + /** Used as a safe reference for `undefined` in pre ES5 environments */ var undefined; - /** Used as the semantic version number. */ - var VERSION = '4.6.1'; - - /** Used as the size to enable large array optimizations. */ - var LARGE_ARRAY_SIZE = 200; - - /** Used as the `TypeError` message for "Functions" methods. */ - var FUNC_ERROR_TEXT = 'Expected a function'; - - /** Used to stand-in for `undefined` hash values. */ - var HASH_UNDEFINED = '__lodash_hash_undefined__'; - - /** Used as the internal argument placeholder. */ - var PLACEHOLDER = '__lodash_placeholder__'; - - /** Used to compose bitmasks for wrapper metadata. */ - var BIND_FLAG = 1, - BIND_KEY_FLAG = 2, - CURRY_BOUND_FLAG = 4, - CURRY_FLAG = 8, - CURRY_RIGHT_FLAG = 16, - PARTIAL_FLAG = 32, - PARTIAL_RIGHT_FLAG = 64, - ARY_FLAG = 128, - REARG_FLAG = 256, - FLIP_FLAG = 512; - - /** Used to compose bitmasks for comparison styles. */ - var UNORDERED_COMPARE_FLAG = 1, - PARTIAL_COMPARE_FLAG = 2; - - /** Used as default options for `_.truncate`. */ - var DEFAULT_TRUNC_LENGTH = 30, - DEFAULT_TRUNC_OMISSION = '...'; - - /** Used to detect hot functions by number of calls within a span of milliseconds. */ - var HOT_COUNT = 150, - HOT_SPAN = 16; - - /** Used to indicate the type of lazy iteratees. */ - var LAZY_FILTER_FLAG = 1, - LAZY_MAP_FLAG = 2, - LAZY_WHILE_FLAG = 3; - - /** Used as references for various `Number` constants. */ - var INFINITY = 1 / 0, - MAX_SAFE_INTEGER = 9007199254740991, - MAX_INTEGER = 1.7976931348623157e+308, - NAN = 0 / 0; - - /** Used as references for the maximum length and index of an array. */ - var MAX_ARRAY_LENGTH = 4294967295, - MAX_ARRAY_INDEX = MAX_ARRAY_LENGTH - 1, - HALF_MAX_ARRAY_LENGTH = MAX_ARRAY_LENGTH >>> 1; - - /** `Object#toString` result references. */ - var argsTag = '[object Arguments]', - arrayTag = '[object Array]', - boolTag = '[object Boolean]', - dateTag = '[object Date]', - errorTag = '[object Error]', - funcTag = '[object Function]', - genTag = '[object GeneratorFunction]', - mapTag = '[object Map]', - numberTag = '[object Number]', - objectTag = '[object Object]', - regexpTag = '[object RegExp]', - setTag = '[object Set]', - stringTag = '[object String]', - symbolTag = '[object Symbol]', - weakMapTag = '[object WeakMap]', - weakSetTag = '[object WeakSet]'; - - var arrayBufferTag = '[object ArrayBuffer]', - float32Tag = '[object Float32Array]', - float64Tag = '[object Float64Array]', - int8Tag = '[object Int8Array]', - int16Tag = '[object Int16Array]', - int32Tag = '[object Int32Array]', - uint8Tag = '[object Uint8Array]', - uint8ClampedTag = '[object Uint8ClampedArray]', - uint16Tag = '[object Uint16Array]', - uint32Tag = '[object Uint32Array]'; - - /** Used to match empty string literals in compiled template source. */ - var reEmptyStringLeading = /\b__p \+= '';/g, - reEmptyStringMiddle = /\b(__p \+=) '' \+/g, - reEmptyStringTrailing = /(__e\(.*?\)|\b__t\)) \+\n'';/g; - - /** Used to match HTML entities and HTML characters. */ - var reEscapedHtml = /&(?:amp|lt|gt|quot|#39|#96);/g, - reUnescapedHtml = /[&<>"'`]/g, - reHasEscapedHtml = RegExp(reEscapedHtml.source), - reHasUnescapedHtml = RegExp(reUnescapedHtml.source); + /** Used to pool arrays and objects used internally */ + var arrayPool = [], + objectPool = []; - /** Used to match template delimiters. */ - var reEscape = /<%-([\s\S]+?)%>/g, - reEvaluate = /<%([\s\S]+?)%>/g, - reInterpolate = /<%=([\s\S]+?)%>/g; + /** Used to generate unique IDs */ + var idCounter = 0; - /** Used to match property names within property paths. */ - var reIsDeepProp = /\.|\[(?:[^[\]]*|(["'])(?:(?!\1)[^\\]|\\.)*?\1)\]/, - reIsPlainProp = /^\w*$/, - rePropName = /[^.[\]]+|\[(?:(-?\d+(?:\.\d+)?)|(["'])((?:(?!\2)[^\\]|\\.)*?)\2)\]/g; + /** Used internally to indicate various things */ + var indicatorObject = {}; - /** Used to match `RegExp` [syntax characters](http://ecma-international.org/ecma-262/6.0/#sec-patterns). */ - var reRegExpChar = /[\\^$.*+?()[\]{}|]/g, - reHasRegExpChar = RegExp(reRegExpChar.source); + /** Used to prefix keys to avoid issues with `__proto__` and properties on `Object.prototype` */ + var keyPrefix = +new Date + ''; - /** Used to match leading and trailing whitespace. */ - var reTrim = /^\s+|\s+$/g, - reTrimStart = /^\s+/, - reTrimEnd = /\s+$/; + /** Used as the size when optimizations are enabled for large arrays */ + var largeArraySize = 75; - /** Used to match backslashes in property paths. */ - var reEscapeChar = /\\(\\)?/g; + /** Used as the max size of the `arrayPool` and `objectPool` */ + var maxPoolSize = 40; - /** Used to match [ES template delimiters](http://ecma-international.org/ecma-262/6.0/#sec-template-literal-lexical-components). */ - var reEsTemplate = /\$\{([^\\}]*(?:\\.[^\\}]*)*)\}/g; + /** Used to detect and test whitespace */ + var whitespace = ( + // whitespace + ' \t\x0B\f\xA0\ufeff' + - /** Used to match `RegExp` flags from their coerced string values. */ - var reFlags = /\w*$/; + // line terminators + '\n\r\u2028\u2029' + - /** Used to detect hexadecimal string values. */ - var reHasHexPrefix = /^0x/i; + // unicode category "Zs" space separators + '\u1680\u180e\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200a\u202f\u205f\u3000' + ); - /** Used to detect bad signed hexadecimal string values. */ - var reIsBadHex = /^[-+]0x[0-9a-f]+$/i; + /** Used to match empty string literals in compiled template source */ + var reEmptyStringLeading = /\b__p \+= '';/g, + reEmptyStringMiddle = /\b(__p \+=) '' \+/g, + reEmptyStringTrailing = /(__e\(.*?\)|\b__t\)) \+\n'';/g; - /** Used to detect binary string values. */ - var reIsBinary = /^0b[01]+$/i; + /** + * Used to match ES6 template delimiters + * http://people.mozilla.org/~jorendorff/es6-draft.html#sec-literals-string-literals + */ + var reEsTemplate = /\$\{([^\\}]*(?:\\.[^\\}]*)*)\}/g; - /** Used to detect host constructors (Safari > 5). */ - var reIsHostCtor = /^\[object .+?Constructor\]$/; + /** Used to match regexp flags from their coerced string values */ + var reFlags = /\w*$/; - /** Used to detect octal string values. */ - var reIsOctal = /^0o[0-7]+$/i; + /** Used to detected named functions */ + var reFuncName = /^\s*function[ \n\r\t]+\w/; - /** Used to detect unsigned integer values. */ - var reIsUint = /^(?:0|[1-9]\d*)$/; + /** Used to match "interpolate" template delimiters */ + var reInterpolate = /<%=([\s\S]+?)%>/g; - /** Used to match latin-1 supplementary letters (excluding mathematical operators). */ - var reLatin1 = /[\xc0-\xd6\xd8-\xde\xdf-\xf6\xf8-\xff]/g; + /** Used to match leading whitespace and zeros to be removed */ + var reLeadingSpacesAndZeros = RegExp('^[' + whitespace + ']*0+(?=.$)'); - /** Used to ensure capturing order of template delimiters. */ + /** Used to ensure capturing order of template delimiters */ var reNoMatch = /($^)/; - /** Used to match unescaped characters in compiled string literals. */ - var reUnescapedString = /['\n\r\u2028\u2029\\]/g; - - /** Used to compose unicode character classes. */ - var rsAstralRange = '\\ud800-\\udfff', - rsComboMarksRange = '\\u0300-\\u036f\\ufe20-\\ufe23', - rsComboSymbolsRange = '\\u20d0-\\u20f0', - rsDingbatRange = '\\u2700-\\u27bf', - rsLowerRange = 'a-z\\xdf-\\xf6\\xf8-\\xff', - rsMathOpRange = '\\xac\\xb1\\xd7\\xf7', - rsNonCharRange = '\\x00-\\x2f\\x3a-\\x40\\x5b-\\x60\\x7b-\\xbf', - rsQuoteRange = '\\u2018\\u2019\\u201c\\u201d', - rsSpaceRange = ' \\t\\x0b\\f\\xa0\\ufeff\\n\\r\\u2028\\u2029\\u1680\\u180e\\u2000\\u2001\\u2002\\u2003\\u2004\\u2005\\u2006\\u2007\\u2008\\u2009\\u200a\\u202f\\u205f\\u3000', - rsUpperRange = 'A-Z\\xc0-\\xd6\\xd8-\\xde', - rsVarRange = '\\ufe0e\\ufe0f', - rsBreakRange = rsMathOpRange + rsNonCharRange + rsQuoteRange + rsSpaceRange; - - /** Used to compose unicode capture groups. */ - var rsAstral = '[' + rsAstralRange + ']', - rsBreak = '[' + rsBreakRange + ']', - rsCombo = '[' + rsComboMarksRange + rsComboSymbolsRange + ']', - rsDigits = '\\d+', - rsDingbat = '[' + rsDingbatRange + ']', - rsLower = '[' + rsLowerRange + ']', - rsMisc = '[^' + rsAstralRange + rsBreakRange + rsDigits + rsDingbatRange + rsLowerRange + rsUpperRange + ']', - rsFitz = '\\ud83c[\\udffb-\\udfff]', - rsModifier = '(?:' + rsCombo + '|' + rsFitz + ')', - rsNonAstral = '[^' + rsAstralRange + ']', - rsRegional = '(?:\\ud83c[\\udde6-\\uddff]){2}', - rsSurrPair = '[\\ud800-\\udbff][\\udc00-\\udfff]', - rsUpper = '[' + rsUpperRange + ']', - rsZWJ = '\\u200d'; - - /** Used to compose unicode regexes. */ - var rsLowerMisc = '(?:' + rsLower + '|' + rsMisc + ')', - rsUpperMisc = '(?:' + rsUpper + '|' + rsMisc + ')', - reOptMod = rsModifier + '?', - rsOptVar = '[' + rsVarRange + ']?', - rsOptJoin = '(?:' + rsZWJ + '(?:' + [rsNonAstral, rsRegional, rsSurrPair].join('|') + ')' + rsOptVar + reOptMod + ')*', - rsSeq = rsOptVar + reOptMod + rsOptJoin, - rsEmoji = '(?:' + [rsDingbat, rsRegional, rsSurrPair].join('|') + ')' + rsSeq, - rsSymbol = '(?:' + [rsNonAstral + rsCombo + '?', rsCombo, rsRegional, rsSurrPair, rsAstral].join('|') + ')'; - - /** - * Used to match [combining diacritical marks](https://en.wikipedia.org/wiki/Combining_Diacritical_Marks) and - * [combining diacritical marks for symbols](https://en.wikipedia.org/wiki/Combining_Diacritical_Marks_for_Symbols). - */ - var reComboMark = RegExp(rsCombo, 'g'); - - /** Used to match [string symbols](https://mathiasbynens.be/notes/javascript-unicode). */ - var reComplexSymbol = RegExp(rsFitz + '(?=' + rsFitz + ')|' + rsSymbol + rsSeq, 'g'); - - /** Used to detect strings with [zero-width joiners or code points from the astral planes](http://eev.ee/blog/2015/09/12/dark-corners-of-unicode/). */ - var reHasComplexSymbol = RegExp('[' + rsZWJ + rsAstralRange + rsComboMarksRange + rsComboSymbolsRange + rsVarRange + ']'); - - /** Used to match non-compound words composed of alphanumeric characters. */ - var reBasicWord = /[a-zA-Z0-9]+/g; - - /** Used to match complex or compound words. */ - var reComplexWord = RegExp([ - rsUpper + '?' + rsLower + '+(?=' + [rsBreak, rsUpper, '$'].join('|') + ')', - rsUpperMisc + '+(?=' + [rsBreak, rsUpper + rsLowerMisc, '$'].join('|') + ')', - rsUpper + '?' + rsLowerMisc + '+', - rsUpper + '+', - rsDigits, - rsEmoji - ].join('|'), 'g'); + /** Used to detect functions containing a `this` reference */ + var reThis = /\bthis\b/; - /** Used to detect strings that need a more robust regexp to match words. */ - var reHasComplexWord = /[a-z][A-Z]|[0-9][a-zA-Z]|[a-zA-Z][0-9]|[^a-zA-Z0-9 ]/; + /** Used to match unescaped characters in compiled string literals */ + var reUnescapedString = /['\n\r\t\u2028\u2029\\]/g; - /** Used to assign default `context` object properties. */ + /** Used to assign default `context` object properties */ var contextProps = [ - 'Array', 'Buffer', 'Date', 'Error', 'Float32Array', 'Float64Array', - 'Function', 'Int8Array', 'Int16Array', 'Int32Array', 'Map', 'Math', 'Object', - 'Reflect', 'RegExp', 'Set', 'String', 'Symbol', 'TypeError', 'Uint8Array', - 'Uint8ClampedArray', 'Uint16Array', 'Uint32Array', 'WeakMap', '_', - 'clearTimeout', 'isFinite', 'parseInt', 'setTimeout' + 'Array', 'Boolean', 'Date', 'Error', 'Function', 'Math', 'Number', 'Object', + 'RegExp', 'String', '_', 'attachEvent', 'clearTimeout', 'isFinite', 'isNaN', + 'parseInt', 'setTimeout' ]; - /** Used to make template sourceURLs easier to identify. */ - var templateCounter = -1; - - /** Used to identify `toStringTag` values of typed arrays. */ - var typedArrayTags = {}; - typedArrayTags[float32Tag] = typedArrayTags[float64Tag] = - typedArrayTags[int8Tag] = typedArrayTags[int16Tag] = - typedArrayTags[int32Tag] = typedArrayTags[uint8Tag] = - typedArrayTags[uint8ClampedTag] = typedArrayTags[uint16Tag] = - typedArrayTags[uint32Tag] = true; - typedArrayTags[argsTag] = typedArrayTags[arrayTag] = - typedArrayTags[arrayBufferTag] = typedArrayTags[boolTag] = - typedArrayTags[dateTag] = typedArrayTags[errorTag] = - typedArrayTags[funcTag] = typedArrayTags[mapTag] = - typedArrayTags[numberTag] = typedArrayTags[objectTag] = - typedArrayTags[regexpTag] = typedArrayTags[setTag] = - typedArrayTags[stringTag] = typedArrayTags[weakMapTag] = false; - - /** Used to identify `toStringTag` values supported by `_.clone`. */ - var cloneableTags = {}; - cloneableTags[argsTag] = cloneableTags[arrayTag] = - cloneableTags[arrayBufferTag] = cloneableTags[boolTag] = - cloneableTags[dateTag] = cloneableTags[float32Tag] = - cloneableTags[float64Tag] = cloneableTags[int8Tag] = - cloneableTags[int16Tag] = cloneableTags[int32Tag] = - cloneableTags[mapTag] = cloneableTags[numberTag] = - cloneableTags[objectTag] = cloneableTags[regexpTag] = - cloneableTags[setTag] = cloneableTags[stringTag] = - cloneableTags[symbolTag] = cloneableTags[uint8Tag] = - cloneableTags[uint8ClampedTag] = cloneableTags[uint16Tag] = - cloneableTags[uint32Tag] = true; - cloneableTags[errorTag] = cloneableTags[funcTag] = - cloneableTags[weakMapTag] = false; - - /** Used to map latin-1 supplementary letters to basic latin letters. */ - var deburredLetters = { - '\xc0': 'A', '\xc1': 'A', '\xc2': 'A', '\xc3': 'A', '\xc4': 'A', '\xc5': 'A', - '\xe0': 'a', '\xe1': 'a', '\xe2': 'a', '\xe3': 'a', '\xe4': 'a', '\xe5': 'a', - '\xc7': 'C', '\xe7': 'c', - '\xd0': 'D', '\xf0': 'd', - '\xc8': 'E', '\xc9': 'E', '\xca': 'E', '\xcb': 'E', - '\xe8': 'e', '\xe9': 'e', '\xea': 'e', '\xeb': 'e', - '\xcC': 'I', '\xcd': 'I', '\xce': 'I', '\xcf': 'I', - '\xeC': 'i', '\xed': 'i', '\xee': 'i', '\xef': 'i', - '\xd1': 'N', '\xf1': 'n', - '\xd2': 'O', '\xd3': 'O', '\xd4': 'O', '\xd5': 'O', '\xd6': 'O', '\xd8': 'O', - '\xf2': 'o', '\xf3': 'o', '\xf4': 'o', '\xf5': 'o', '\xf6': 'o', '\xf8': 'o', - '\xd9': 'U', '\xda': 'U', '\xdb': 'U', '\xdc': 'U', - '\xf9': 'u', '\xfa': 'u', '\xfb': 'u', '\xfc': 'u', - '\xdd': 'Y', '\xfd': 'y', '\xff': 'y', - '\xc6': 'Ae', '\xe6': 'ae', - '\xde': 'Th', '\xfe': 'th', - '\xdf': 'ss' + /** Used to fix the JScript [[DontEnum]] bug */ + var shadowedProps = [ + 'constructor', 'hasOwnProperty', 'isPrototypeOf', 'propertyIsEnumerable', + 'toLocaleString', 'toString', 'valueOf' + ]; + + /** Used to make template sourceURLs easier to identify */ + var templateCounter = 0; + + /** `Object#toString` result shortcuts */ + var argsClass = '[object Arguments]', + arrayClass = '[object Array]', + boolClass = '[object Boolean]', + dateClass = '[object Date]', + errorClass = '[object Error]', + funcClass = '[object Function]', + numberClass = '[object Number]', + objectClass = '[object Object]', + regexpClass = '[object RegExp]', + stringClass = '[object String]'; + + /** Used to identify object classifications that `_.clone` supports */ + var cloneableClasses = {}; + cloneableClasses[funcClass] = false; + cloneableClasses[argsClass] = cloneableClasses[arrayClass] = + cloneableClasses[boolClass] = cloneableClasses[dateClass] = + cloneableClasses[numberClass] = cloneableClasses[objectClass] = + cloneableClasses[regexpClass] = cloneableClasses[stringClass] = true; + + /** Used as an internal `_.debounce` options object */ + var debounceOptions = { + 'leading': false, + 'maxWait': 0, + 'trailing': false }; - /** Used to map characters to HTML entities. */ - var htmlEscapes = { - '&': '&', - '<': '<', - '>': '>', - '"': '"', - "'": ''', - '`': '`' + /** Used as the property descriptor for `__bindData__` */ + var descriptor = { + 'configurable': false, + 'enumerable': false, + 'value': null, + 'writable': false }; - /** Used to map HTML entities to characters. */ - var htmlUnescapes = { - '&': '&', - '<': '<', - '>': '>', - '"': '"', - ''': "'", - '`': '`' + /** Used as the data object for `iteratorTemplate` */ + var iteratorData = { + 'args': '', + 'array': null, + 'bottom': '', + 'firstArg': '', + 'init': '', + 'keys': null, + 'loop': '', + 'shadowedProps': null, + 'support': null, + 'top': '', + 'useHas': false }; - /** Used to determine if values are of the language type `Object`. */ + /** Used to determine if values are of the language type Object */ var objectTypes = { + 'boolean': false, 'function': true, - 'object': true + 'object': true, + 'number': false, + 'string': false, + 'undefined': false }; - /** Used to escape characters for inclusion in compiled string literals. */ + /** Used to escape characters for inclusion in compiled string literals */ var stringEscapes = { '\\': '\\', "'": "'", '\n': 'n', '\r': 'r', + '\t': 't', '\u2028': 'u2028', '\u2029': 'u2029' }; - /** Built-in method references without a dependency on `root`. */ - var freeParseFloat = parseFloat, - freeParseInt = parseInt; - - /** Detect free variable `exports`. */ - var freeExports = (objectTypes[typeof exports] && exports && !exports.nodeType) - ? exports - : undefined; - - /** Detect free variable `module`. */ - var freeModule = (objectTypes[typeof module] && module && !module.nodeType) - ? module - : undefined; + /** Used as a reference to the global object */ + var root = (objectTypes[typeof window] && window) || this; - /** Detect the popular CommonJS extension `module.exports`. */ - var moduleExports = (freeModule && freeModule.exports === freeExports) - ? freeExports - : undefined; - - /** Detect free variable `global` from Node.js. */ - var freeGlobal = checkGlobal(freeExports && freeModule && typeof global == 'object' && global); - - /** Detect free variable `self`. */ - var freeSelf = checkGlobal(objectTypes[typeof self] && self); - - /** Detect free variable `window`. */ - var freeWindow = checkGlobal(objectTypes[typeof window] && window); - - /** Detect `this` as the global object. */ - var thisGlobal = checkGlobal(objectTypes[typeof this] && this); - - /** - * Used as a reference to the global object. - * - * The `this` value is used if it's the global object to avoid Greasemonkey's - * restricted `window` object, otherwise the `window` object is used. - */ - var root = freeGlobal || - ((freeWindow !== (thisGlobal && thisGlobal.window)) && freeWindow) || - freeSelf || thisGlobal || Function('return this')(); + /** Detect free variable `exports` */ + var freeExports = objectTypes[typeof exports] && exports && !exports.nodeType && exports; - /*--------------------------------------------------------------------------*/ + /** Detect free variable `module` */ + var freeModule = objectTypes[typeof module] && module && !module.nodeType && module; - /** - * Adds the key-value `pair` to `map`. - * - * @private - * @param {Object} map The map to modify. - * @param {Array} pair The key-value pair to add. - * @returns {Object} Returns `map`. - */ - function addMapEntry(map, pair) { - // Don't return `Map#set` because it doesn't return the map instance in IE 11. - map.set(pair[0], pair[1]); - return map; - } + /** Detect the popular CommonJS extension `module.exports` */ + var moduleExports = freeModule && freeModule.exports === freeExports && freeExports; - /** - * Adds `value` to `set`. - * - * @private - * @param {Object} set The set to modify. - * @param {*} value The value to add. - * @returns {Object} Returns `set`. - */ - function addSetEntry(set, value) { - set.add(value); - return set; + /** Detect free variable `global` from Node.js or Browserified code and use it as `root` */ + var freeGlobal = objectTypes[typeof global] && global; + if (freeGlobal && (freeGlobal.global === freeGlobal || freeGlobal.window === freeGlobal)) { + root = freeGlobal; } - /** - * A faster alternative to `Function#apply`, this function invokes `func` - * with the `this` binding of `thisArg` and the arguments of `args`. - * - * @private - * @param {Function} func The function to invoke. - * @param {*} thisArg The `this` binding of `func`. - * @param {...*} args The arguments to invoke `func` with. - * @returns {*} Returns the result of `func`. - */ - function apply(func, thisArg, args) { - var length = args.length; - switch (length) { - case 0: return func.call(thisArg); - case 1: return func.call(thisArg, args[0]); - case 2: return func.call(thisArg, args[0], args[1]); - case 3: return func.call(thisArg, args[0], args[1], args[2]); - } - return func.apply(thisArg, args); - } + /*--------------------------------------------------------------------------*/ /** - * A specialized version of `baseAggregator` for arrays. + * The base implementation of `_.indexOf` without support for binary searches + * or `fromIndex` constraints. * * @private - * @param {Array} array The array to iterate over. - * @param {Function} setter The function to set `accumulator` values. - * @param {Function} iteratee The iteratee to transform keys. - * @param {Object} accumulator The initial aggregated object. - * @returns {Function} Returns `accumulator`. + * @param {Array} array The array to search. + * @param {*} value The value to search for. + * @param {number} [fromIndex=0] The index to search from. + * @returns {number} Returns the index of the matched value or `-1`. */ - function arrayAggregator(array, setter, iteratee, accumulator) { - var index = -1, - length = array.length; + function baseIndexOf(array, value, fromIndex) { + var index = (fromIndex || 0) - 1, + length = array ? array.length : 0; while (++index < length) { - var value = array[index]; - setter(accumulator, value, iteratee(value), array); + if (array[index] === value) { + return index; + } } - return accumulator; + return -1; } /** - * Creates a new array concatenating `array` with `other`. + * An implementation of `_.contains` for cache objects that mimics the return + * signature of `_.indexOf` by returning `0` if the value is found, else `-1`. * * @private - * @param {Array} array The first array to concatenate. - * @param {Array} other The second array to concatenate. - * @returns {Array} Returns the new concatenated array. + * @param {Object} cache The cache object to inspect. + * @param {*} value The value to search for. + * @returns {number} Returns `0` if `value` is found, else `-1`. */ - function arrayConcat(array, other) { - var index = -1, - length = array.length, - othIndex = -1, - othLength = other.length, - result = Array(length + othLength); + function cacheIndexOf(cache, value) { + var type = typeof value; + cache = cache.cache; - while (++index < length) { - result[index] = array[index]; + if (type == 'boolean' || value == null) { + return cache[value] ? 0 : -1; } - while (++othIndex < othLength) { - result[index++] = other[othIndex]; + if (type != 'number' && type != 'string') { + type = 'object'; } - return result; + var key = type == 'number' ? value : keyPrefix + value; + cache = (cache = cache[type]) && cache[key]; + + return type == 'object' + ? (cache && baseIndexOf(cache, value) > -1 ? 0 : -1) + : (cache ? 0 : -1); } /** - * A specialized version of `_.forEach` for arrays without support for - * iteratee shorthands. + * Adds a given value to the corresponding cache object. * * @private - * @param {Array} array The array to iterate over. - * @param {Function} iteratee The function invoked per iteration. - * @returns {Array} Returns `array`. + * @param {*} value The value to add to the cache. */ - function arrayEach(array, iteratee) { - var index = -1, - length = array.length; + function cachePush(value) { + var cache = this.cache, + type = typeof value; - while (++index < length) { - if (iteratee(array[index], index, array) === false) { - break; + if (type == 'boolean' || value == null) { + cache[value] = true; + } else { + if (type != 'number' && type != 'string') { + type = 'object'; + } + var key = type == 'number' ? value : keyPrefix + value, + typeCache = cache[type] || (cache[type] = {}); + + if (type == 'object') { + (typeCache[key] || (typeCache[key] = [])).push(value); + } else { + typeCache[key] = true; } } - return array; } /** - * A specialized version of `_.forEachRight` for arrays without support for - * iteratee shorthands. + * Used by `_.max` and `_.min` as the default callback when a given + * collection is a string value. * * @private - * @param {Array} array The array to iterate over. - * @param {Function} iteratee The function invoked per iteration. - * @returns {Array} Returns `array`. + * @param {string} value The character to inspect. + * @returns {number} Returns the code unit of given character. */ - function arrayEachRight(array, iteratee) { - var length = array.length; - - while (length--) { - if (iteratee(array[length], length, array) === false) { - break; - } - } - return array; + function charAtCallback(value) { + return value.charCodeAt(0); } /** - * A specialized version of `_.every` for arrays without support for - * iteratee shorthands. + * Used by `sortBy` to compare transformed `collection` elements, stable sorting + * them in ascending order. * * @private - * @param {Array} array The array to iterate over. - * @param {Function} predicate The function invoked per iteration. - * @returns {boolean} Returns `true` if all elements pass the predicate check, else `false`. + * @param {Object} a The object to compare to `b`. + * @param {Object} b The object to compare to `a`. + * @returns {number} Returns the sort order indicator of `1` or `-1`. */ - function arrayEvery(array, predicate) { - var index = -1, - length = array.length; + function compareAscending(a, b) { + var ac = a.criteria, + bc = b.criteria, + index = -1, + length = ac.length; while (++index < length) { - if (!predicate(array[index], index, array)) { - return false; + var value = ac[index], + other = bc[index]; + + if (value !== other) { + if (value > other || typeof value == 'undefined') { + return 1; + } + if (value < other || typeof other == 'undefined') { + return -1; + } } } - return true; + // Fixes an `Array#sort` bug in the JS engine embedded in Adobe applications + // that causes it, under certain circumstances, to return the same value for + // `a` and `b`. See https://github.com/jashkenas/underscore/pull/1247 + // + // This also ensures a stable sort in V8 and other engines. + // See http://code.google.com/p/v8/issues/detail?id=90 + return a.index - b.index; } /** - * A specialized version of `_.filter` for arrays without support for - * iteratee shorthands. + * Creates a cache object to optimize linear searches of large arrays. * * @private - * @param {Array} array The array to iterate over. - * @param {Function} predicate The function invoked per iteration. - * @returns {Array} Returns the new filtered array. + * @param {Array} [array=[]] The array to search. + * @returns {null|Object} Returns the cache object or `null` if caching should not be used. */ - function arrayFilter(array, predicate) { + function createCache(array) { var index = -1, length = array.length, - resIndex = 0, - result = []; + first = array[0], + mid = array[(length / 2) | 0], + last = array[length - 1]; + + if (first && typeof first == 'object' && + mid && typeof mid == 'object' && last && typeof last == 'object') { + return false; + } + var cache = getObject(); + cache['false'] = cache['null'] = cache['true'] = cache['undefined'] = false; + + var result = getObject(); + result.array = array; + result.cache = cache; + result.push = cachePush; while (++index < length) { - var value = array[index]; - if (predicate(value, index, array)) { - result[resIndex++] = value; - } + result.push(array[index]); } return result; } /** - * A specialized version of `_.includes` for arrays without support for - * specifying an index to search from. + * Used by `template` to escape characters for inclusion in compiled + * string literals. * * @private - * @param {Array} array The array to search. - * @param {*} target The value to search for. - * @returns {boolean} Returns `true` if `target` is found, else `false`. + * @param {string} match The matched character to escape. + * @returns {string} Returns the escaped character. */ - function arrayIncludes(array, value) { - return !!array.length && baseIndexOf(array, value, 0) > -1; + function escapeStringChar(match) { + return '\\' + stringEscapes[match]; } /** - * This function is like `arrayIncludes` except that it accepts a comparator. + * Gets an array from the array pool or creates a new one if the pool is empty. * * @private - * @param {Array} array The array to search. - * @param {*} target The value to search for. - * @param {Function} comparator The comparator invoked per element. - * @returns {boolean} Returns `true` if `target` is found, else `false`. + * @returns {Array} The array from the pool. */ - function arrayIncludesWith(array, value, comparator) { - var index = -1, - length = array.length; - - while (++index < length) { - if (comparator(value, array[index])) { - return true; - } - } - return false; + function getArray() { + return arrayPool.pop() || []; } /** - * A specialized version of `_.map` for arrays without support for iteratee - * shorthands. + * Gets an object from the object pool or creates a new one if the pool is empty. * * @private - * @param {Array} array The array to iterate over. - * @param {Function} iteratee The function invoked per iteration. - * @returns {Array} Returns the new mapped array. + * @returns {Object} The object from the pool. */ - function arrayMap(array, iteratee) { - var index = -1, - length = array.length, - result = Array(length); - - while (++index < length) { - result[index] = iteratee(array[index], index, array); - } - return result; + function getObject() { + return objectPool.pop() || { + 'array': null, + 'cache': null, + 'criteria': null, + 'false': false, + 'index': 0, + 'null': false, + 'number': null, + 'object': null, + 'push': null, + 'string': null, + 'true': false, + 'undefined': false, + 'value': null + }; } /** - * Appends the elements of `values` to `array`. + * Checks if `value` is a DOM node in IE < 9. * * @private - * @param {Array} array The array to modify. - * @param {Array} values The values to append. - * @returns {Array} Returns `array`. + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if the `value` is a DOM node, else `false`. */ - function arrayPush(array, values) { - var index = -1, - length = values.length, - offset = array.length; - - while (++index < length) { - array[offset + index] = values[index]; - } - return array; + function isNode(value) { + // IE < 9 presents DOM nodes as `Object` objects except they have `toString` + // methods that are `typeof` "string" and still can coerce nodes to strings + return typeof value.toString != 'function' && typeof (value + '') == 'string'; } /** - * A specialized version of `_.reduce` for arrays without support for - * iteratee shorthands. + * Releases the given array back to the array pool. * * @private - * @param {Array} array The array to iterate over. - * @param {Function} iteratee The function invoked per iteration. - * @param {*} [accumulator] The initial value. - * @param {boolean} [initAccum] Specify using the first element of `array` as the initial value. - * @returns {*} Returns the accumulated value. + * @param {Array} [array] The array to release. */ - function arrayReduce(array, iteratee, accumulator, initAccum) { - var index = -1, - length = array.length; - - if (initAccum && length) { - accumulator = array[++index]; - } - while (++index < length) { - accumulator = iteratee(accumulator, array[index], index, array); + function releaseArray(array) { + array.length = 0; + if (arrayPool.length < maxPoolSize) { + arrayPool.push(array); } - return accumulator; } /** - * A specialized version of `_.reduceRight` for arrays without support for - * iteratee shorthands. + * Releases the given object back to the object pool. * * @private - * @param {Array} array The array to iterate over. - * @param {Function} iteratee The function invoked per iteration. - * @param {*} [accumulator] The initial value. - * @param {boolean} [initAccum] Specify using the last element of `array` as the initial value. - * @returns {*} Returns the accumulated value. + * @param {Object} [object] The object to release. */ - function arrayReduceRight(array, iteratee, accumulator, initAccum) { - var length = array.length; - if (initAccum && length) { - accumulator = array[--length]; + function releaseObject(object) { + var cache = object.cache; + if (cache) { + releaseObject(cache); } - while (length--) { - accumulator = iteratee(accumulator, array[length], length, array); + object.array = object.cache = object.criteria = object.object = object.number = object.string = object.value = null; + if (objectPool.length < maxPoolSize) { + objectPool.push(object); } - return accumulator; } /** - * A specialized version of `_.some` for arrays without support for iteratee - * shorthands. + * Slices the `collection` from the `start` index up to, but not including, + * the `end` index. * - * @private - * @param {Array} array The array to iterate over. - * @param {Function} predicate The function invoked per iteration. - * @returns {boolean} Returns `true` if any element passes the predicate check, else `false`. - */ - function arraySome(array, predicate) { - var index = -1, - length = array.length; - - while (++index < length) { - if (predicate(array[index], index, array)) { - return true; - } - } - return false; - } - - /** - * The base implementation of methods like `_.max` and `_.min` which accepts a - * `comparator` to determine the extremum value. + * Note: This function is used instead of `Array#slice` to support node lists + * in IE < 9 and to ensure dense arrays are returned. * * @private - * @param {Array} array The array to iterate over. - * @param {Function} iteratee The iteratee invoked per iteration. - * @param {Function} comparator The comparator used to compare values. - * @returns {*} Returns the extremum value. + * @param {Array|Object|string} collection The collection to slice. + * @param {number} start The start index. + * @param {number} end The end index. + * @returns {Array} Returns the new array. */ - function baseExtremum(array, iteratee, comparator) { + function slice(array, start, end) { + start || (start = 0); + if (typeof end == 'undefined') { + end = array ? array.length : 0; + } var index = -1, - length = array.length; + length = end - start || 0, + result = Array(length < 0 ? 0 : length); while (++index < length) { - var value = array[index], - current = iteratee(value); - - if (current != null && (computed === undefined - ? current === current - : comparator(current, computed) - )) { - var computed = current, - result = value; - } + result[index] = array[start + index]; } return result; } - /** - * The base implementation of methods like `_.find` and `_.findKey`, without - * support for iteratee shorthands, which iterates over `collection` using - * `eachFunc`. - * - * @private - * @param {Array|Object} collection The collection to search. - * @param {Function} predicate The function invoked per iteration. - * @param {Function} eachFunc The function to iterate over `collection`. - * @param {boolean} [retKey] Specify returning the key of the found element instead of the element itself. - * @returns {*} Returns the found element or its key, else `undefined`. - */ - function baseFind(collection, predicate, eachFunc, retKey) { - var result; - eachFunc(collection, function(value, key, collection) { - if (predicate(value, key, collection)) { - result = retKey ? key : value; - return false; - } - }); - return result; - } + /*--------------------------------------------------------------------------*/ /** - * The base implementation of `_.findIndex` and `_.findLastIndex` without - * support for iteratee shorthands. + * Create a new `lodash` function using the given context object. * - * @private - * @param {Array} array The array to search. - * @param {Function} predicate The function invoked per iteration. - * @param {boolean} [fromRight] Specify iterating from right to left. - * @returns {number} Returns the index of the matched value, else `-1`. + * @static + * @memberOf _ + * @category Utilities + * @param {Object} [context=root] The context object. + * @returns {Function} Returns the `lodash` function. */ - function baseFindIndex(array, predicate, fromRight) { - var length = array.length, - index = fromRight ? length : -1; + function runInContext(context) { + // Avoid issues with some ES3 environments that attempt to use values, named + // after built-in constructors like `Object`, for the creation of literals. + // ES5 clears this up by stating that literals must use built-in constructors. + // See http://es5.github.io/#x11.1.5. + context = context ? _.defaults(root.Object(), context, _.pick(root, contextProps)) : root; + + /** Native constructor references */ + var Array = context.Array, + Boolean = context.Boolean, + Date = context.Date, + Error = context.Error, + Function = context.Function, + Math = context.Math, + Number = context.Number, + Object = context.Object, + RegExp = context.RegExp, + String = context.String, + TypeError = context.TypeError; - while ((fromRight ? index-- : ++index < length)) { - if (predicate(array[index], index, array)) { - return index; - } - } - return -1; - } + /** + * Used for `Array` method references. + * + * Normally `Array.prototype` would suffice, however, using an array literal + * avoids issues in Narwhal. + */ + var arrayRef = []; - /** - * The base implementation of `_.indexOf` without `fromIndex` bounds checks. - * - * @private - * @param {Array} array The array to search. - * @param {*} value The value to search for. - * @param {number} fromIndex The index to search from. - * @returns {number} Returns the index of the matched value, else `-1`. - */ - function baseIndexOf(array, value, fromIndex) { - if (value !== value) { - return indexOfNaN(array, fromIndex); - } - var index = fromIndex - 1, - length = array.length; + /** Used for native method references */ + var errorProto = Error.prototype, + objectProto = Object.prototype, + stringProto = String.prototype; - while (++index < length) { - if (array[index] === value) { - return index; - } - } - return -1; - } + /** Used to restore the original `_` reference in `noConflict` */ + var oldDash = context._; - /** - * This function is like `baseIndexOf` except that it accepts a comparator. - * - * @private - * @param {Array} array The array to search. - * @param {*} value The value to search for. - * @param {number} fromIndex The index to search from. - * @param {Function} comparator The comparator invoked per element. - * @returns {number} Returns the index of the matched value, else `-1`. - */ - function baseIndexOfWith(array, value, fromIndex, comparator) { - var index = fromIndex - 1, - length = array.length; + /** Used to resolve the internal [[Class]] of values */ + var toString = objectProto.toString; - while (++index < length) { - if (comparator(array[index], value)) { - return index; - } - } - return -1; - } + /** Used to detect if a method is native */ + var reNative = RegExp('^' + + String(toString) + .replace(/[.*+?^${}()|[\]\\]/g, '\\$&') + .replace(/toString| for [^\]]+/g, '.*?') + '$' + ); - /** - * The base implementation of `_.reduce` and `_.reduceRight`, without support - * for iteratee shorthands, which iterates over `collection` using `eachFunc`. - * - * @private - * @param {Array|Object} collection The collection to iterate over. - * @param {Function} iteratee The function invoked per iteration. - * @param {*} accumulator The initial value. - * @param {boolean} initAccum Specify using the first or last element of `collection` as the initial value. - * @param {Function} eachFunc The function to iterate over `collection`. - * @returns {*} Returns the accumulated value. - */ - function baseReduce(collection, iteratee, accumulator, initAccum, eachFunc) { - eachFunc(collection, function(value, index, collection) { - accumulator = initAccum - ? (initAccum = false, value) - : iteratee(accumulator, value, index, collection); - }); - return accumulator; - } + /** Native method shortcuts */ + var ceil = Math.ceil, + clearTimeout = context.clearTimeout, + floor = Math.floor, + fnToString = Function.prototype.toString, + getPrototypeOf = isNative(getPrototypeOf = Object.getPrototypeOf) && getPrototypeOf, + hasOwnProperty = objectProto.hasOwnProperty, + push = arrayRef.push, + propertyIsEnumerable = objectProto.propertyIsEnumerable, + setTimeout = context.setTimeout, + splice = arrayRef.splice, + unshift = arrayRef.unshift; - /** - * The base implementation of `_.sortBy` which uses `comparer` to define the - * sort order of `array` and replaces criteria objects with their corresponding - * values. - * - * @private - * @param {Array} array The array to sort. - * @param {Function} comparer The function to define sort order. - * @returns {Array} Returns `array`. - */ - function baseSortBy(array, comparer) { - var length = array.length; + /** Used to set meta data on functions */ + var defineProperty = (function() { + // IE 8 only accepts DOM elements + try { + var o = {}, + func = isNative(func = Object.defineProperty) && func, + result = func(o, o, o) && func; + } catch(e) { } + return result; + }()); - array.sort(comparer); - while (length--) { - array[length] = array[length].value; - } - return array; - } + /* Native method shortcuts for methods with the same name as other `lodash` methods */ + var nativeCreate = isNative(nativeCreate = Object.create) && nativeCreate, + nativeIsArray = isNative(nativeIsArray = Array.isArray) && nativeIsArray, + nativeIsFinite = context.isFinite, + nativeIsNaN = context.isNaN, + nativeKeys = isNative(nativeKeys = Object.keys) && nativeKeys, + nativeMax = Math.max, + nativeMin = Math.min, + nativeParseInt = context.parseInt, + nativeRandom = Math.random; + + /** Used to lookup a built-in constructor by [[Class]] */ + var ctorByClass = {}; + ctorByClass[arrayClass] = Array; + ctorByClass[boolClass] = Boolean; + ctorByClass[dateClass] = Date; + ctorByClass[funcClass] = Function; + ctorByClass[objectClass] = Object; + ctorByClass[numberClass] = Number; + ctorByClass[regexpClass] = RegExp; + ctorByClass[stringClass] = String; + + /** Used to avoid iterating non-enumerable properties in IE < 9 */ + var nonEnumProps = {}; + nonEnumProps[arrayClass] = nonEnumProps[dateClass] = nonEnumProps[numberClass] = { 'constructor': true, 'toLocaleString': true, 'toString': true, 'valueOf': true }; + nonEnumProps[boolClass] = nonEnumProps[stringClass] = { 'constructor': true, 'toString': true, 'valueOf': true }; + nonEnumProps[errorClass] = nonEnumProps[funcClass] = nonEnumProps[regexpClass] = { 'constructor': true, 'toString': true }; + nonEnumProps[objectClass] = { 'constructor': true }; + + (function() { + var length = shadowedProps.length; + while (length--) { + var key = shadowedProps[length]; + for (var className in nonEnumProps) { + if (hasOwnProperty.call(nonEnumProps, className) && !hasOwnProperty.call(nonEnumProps[className], key)) { + nonEnumProps[className][key] = false; + } + } + } + }()); - /** - * The base implementation of `_.sum` without support for iteratee shorthands. - * - * @private - * @param {Array} array The array to iterate over. - * @param {Function} iteratee The function invoked per iteration. - * @returns {number} Returns the sum. - */ - function baseSum(array, iteratee) { - var result, - index = -1, - length = array.length; + /*--------------------------------------------------------------------------*/ - while (++index < length) { - var current = iteratee(array[index]); - if (current !== undefined) { - result = result === undefined ? current : (result + current); - } + /** + * Creates a `lodash` object which wraps the given value to enable intuitive + * method chaining. + * + * In addition to Lo-Dash methods, wrappers also have the following `Array` methods: + * `concat`, `join`, `pop`, `push`, `reverse`, `shift`, `slice`, `sort`, `splice`, + * and `unshift` + * + * Chaining is supported in custom builds as long as the `value` method is + * implicitly or explicitly included in the build. + * + * The chainable wrapper functions are: + * `after`, `assign`, `bind`, `bindAll`, `bindKey`, `chain`, `compact`, + * `compose`, `concat`, `countBy`, `create`, `createCallback`, `curry`, + * `debounce`, `defaults`, `defer`, `delay`, `difference`, `filter`, `flatten`, + * `forEach`, `forEachRight`, `forIn`, `forInRight`, `forOwn`, `forOwnRight`, + * `functions`, `groupBy`, `indexBy`, `initial`, `intersection`, `invert`, + * `invoke`, `keys`, `map`, `max`, `memoize`, `merge`, `min`, `object`, `omit`, + * `once`, `pairs`, `partial`, `partialRight`, `pick`, `pluck`, `pull`, `push`, + * `range`, `reject`, `remove`, `rest`, `reverse`, `shuffle`, `slice`, `sort`, + * `sortBy`, `splice`, `tap`, `throttle`, `times`, `toArray`, `transform`, + * `union`, `uniq`, `unshift`, `unzip`, `values`, `where`, `without`, `wrap`, + * and `zip` + * + * The non-chainable wrapper functions are: + * `clone`, `cloneDeep`, `contains`, `escape`, `every`, `find`, `findIndex`, + * `findKey`, `findLast`, `findLastIndex`, `findLastKey`, `has`, `identity`, + * `indexOf`, `isArguments`, `isArray`, `isBoolean`, `isDate`, `isElement`, + * `isEmpty`, `isEqual`, `isFinite`, `isFunction`, `isNaN`, `isNull`, `isNumber`, + * `isObject`, `isPlainObject`, `isRegExp`, `isString`, `isUndefined`, `join`, + * `lastIndexOf`, `mixin`, `noConflict`, `parseInt`, `pop`, `random`, `reduce`, + * `reduceRight`, `result`, `shift`, `size`, `some`, `sortedIndex`, `runInContext`, + * `template`, `unescape`, `uniqueId`, and `value` + * + * The wrapper functions `first` and `last` return wrapped values when `n` is + * provided, otherwise they return unwrapped values. + * + * Explicit chaining can be enabled by using the `_.chain` method. + * + * @name _ + * @constructor + * @category Chaining + * @param {*} value The value to wrap in a `lodash` instance. + * @returns {Object} Returns a `lodash` instance. + * @example + * + * var wrapped = _([1, 2, 3]); + * + * // returns an unwrapped value + * wrapped.reduce(function(sum, num) { + * return sum + num; + * }); + * // => 6 + * + * // returns a wrapped value + * var squares = wrapped.map(function(num) { + * return num * num; + * }); + * + * _.isArray(squares); + * // => false + * + * _.isArray(squares.value()); + * // => true + */ + function lodash(value) { + // don't wrap if already wrapped, even if wrapped by a different `lodash` constructor + return (value && typeof value == 'object' && !isArray(value) && hasOwnProperty.call(value, '__wrapped__')) + ? value + : new lodashWrapper(value); } - return result; - } - - /** - * The base implementation of `_.times` without support for iteratee shorthands - * or max array length checks. - * - * @private - * @param {number} n The number of times to invoke `iteratee`. - * @param {Function} iteratee The function invoked per iteration. - * @returns {Array} Returns the array of results. - */ - function baseTimes(n, iteratee) { - var index = -1, - result = Array(n); - while (++index < n) { - result[index] = iteratee(index); + /** + * A fast path for creating `lodash` wrapper objects. + * + * @private + * @param {*} value The value to wrap in a `lodash` instance. + * @param {boolean} chainAll A flag to enable chaining for all methods + * @returns {Object} Returns a `lodash` instance. + */ + function lodashWrapper(value, chainAll) { + this.__chain__ = !!chainAll; + this.__wrapped__ = value; } - return result; - } - - /** - * The base implementation of `_.toPairs` and `_.toPairsIn` which creates an array - * of key-value pairs for `object` corresponding to the property names of `props`. - * - * @private - * @param {Object} object The object to query. - * @param {Array} props The property names to get values for. - * @returns {Object} Returns the new array of key-value pairs. - */ - function baseToPairs(object, props) { - return arrayMap(props, function(key) { - return [key, object[key]]; - }); - } - - /** - * The base implementation of `_.unary` without support for storing wrapper metadata. - * - * @private - * @param {Function} func The function to cap arguments for. - * @returns {Function} Returns the new function. - */ - function baseUnary(func) { - return function(value) { - return func(value); - }; - } - - /** - * The base implementation of `_.values` and `_.valuesIn` which creates an - * array of `object` property values corresponding to the property names - * of `props`. - * - * @private - * @param {Object} object The object to query. - * @param {Array} props The property names to get values for. - * @returns {Object} Returns the array of property values. - */ - function baseValues(object, props) { - return arrayMap(props, function(key) { - return object[key]; - }); - } - - /** - * Used by `_.trim` and `_.trimStart` to get the index of the first string symbol - * that is not found in the character symbols. - * - * @private - * @param {Array} strSymbols The string symbols to inspect. - * @param {Array} chrSymbols The character symbols to find. - * @returns {number} Returns the index of the first unmatched string symbol. - */ - function charsStartIndex(strSymbols, chrSymbols) { - var index = -1, - length = strSymbols.length; - - while (++index < length && baseIndexOf(chrSymbols, strSymbols[index], 0) > -1) {} - return index; - } - - /** - * Used by `_.trim` and `_.trimEnd` to get the index of the last string symbol - * that is not found in the character symbols. - * - * @private - * @param {Array} strSymbols The string symbols to inspect. - * @param {Array} chrSymbols The character symbols to find. - * @returns {number} Returns the index of the last unmatched string symbol. - */ - function charsEndIndex(strSymbols, chrSymbols) { - var index = strSymbols.length; - - while (index-- && baseIndexOf(chrSymbols, strSymbols[index], 0) > -1) {} - return index; - } - - /** - * Checks if `value` is a global object. - * - * @private - * @param {*} value The value to check. - * @returns {null|Object} Returns `value` if it's a global object, else `null`. - */ - function checkGlobal(value) { - return (value && value.Object === Object) ? value : null; - } - - /** - * Compares values to sort them in ascending order. - * - * @private - * @param {*} value The value to compare. - * @param {*} other The other value to compare. - * @returns {number} Returns the sort order indicator for `value`. - */ - function compareAscending(value, other) { - if (value !== other) { - var valIsNull = value === null, - valIsUndef = value === undefined, - valIsReflexive = value === value; - - var othIsNull = other === null, - othIsUndef = other === undefined, - othIsReflexive = other === other; - - if ((value > other && !othIsNull) || !valIsReflexive || - (valIsNull && !othIsUndef && othIsReflexive) || - (valIsUndef && othIsReflexive)) { - return 1; - } - if ((value < other && !valIsNull) || !othIsReflexive || - (othIsNull && !valIsUndef && valIsReflexive) || - (othIsUndef && valIsReflexive)) { - return -1; - } - } - return 0; - } - - /** - * Used by `_.orderBy` to compare multiple properties of a value to another - * and stable sort them. - * - * If `orders` is unspecified, all values are sorted in ascending order. Otherwise, - * specify an order of "desc" for descending or "asc" for ascending sort order - * of corresponding values. - * - * @private - * @param {Object} object The object to compare. - * @param {Object} other The other object to compare. - * @param {boolean[]|string[]} orders The order to sort by for each property. - * @returns {number} Returns the sort order indicator for `object`. - */ - function compareMultiple(object, other, orders) { - var index = -1, - objCriteria = object.criteria, - othCriteria = other.criteria, - length = objCriteria.length, - ordersLength = orders.length; - - while (++index < length) { - var result = compareAscending(objCriteria[index], othCriteria[index]); - if (result) { - if (index >= ordersLength) { - return result; - } - var order = orders[index]; - return result * (order == 'desc' ? -1 : 1); - } - } - // Fixes an `Array#sort` bug in the JS engine embedded in Adobe applications - // that causes it, under certain circumstances, to provide the same value for - // `object` and `other`. See https://github.com/jashkenas/underscore/pull/1247 - // for more details. - // - // This also ensures a stable sort in V8 and other engines. - // See https://code.google.com/p/v8/issues/detail?id=90 for more details. - return object.index - other.index; - } - - /** - * Gets the number of `placeholder` occurrences in `array`. - * - * @private - * @param {Array} array The array to inspect. - * @param {*} placeholder The placeholder to search for. - * @returns {number} Returns the placeholder count. - */ - function countHolders(array, placeholder) { - var length = array.length, - result = 0; - - while (length--) { - if (array[length] === placeholder) { - result++; - } - } - return result; - } - - /** - * Used by `_.deburr` to convert latin-1 supplementary letters to basic latin letters. - * - * @private - * @param {string} letter The matched letter to deburr. - * @returns {string} Returns the deburred letter. - */ - function deburrLetter(letter) { - return deburredLetters[letter]; - } - - /** - * Used by `_.escape` to convert characters to HTML entities. - * - * @private - * @param {string} chr The matched character to escape. - * @returns {string} Returns the escaped character. - */ - function escapeHtmlChar(chr) { - return htmlEscapes[chr]; - } - - /** - * Used by `_.template` to escape characters for inclusion in compiled string literals. - * - * @private - * @param {string} chr The matched character to escape. - * @returns {string} Returns the escaped character. - */ - function escapeStringChar(chr) { - return '\\' + stringEscapes[chr]; - } - - /** - * Gets the index at which the first occurrence of `NaN` is found in `array`. - * - * @private - * @param {Array} array The array to search. - * @param {number} fromIndex The index to search from. - * @param {boolean} [fromRight] Specify iterating from right to left. - * @returns {number} Returns the index of the matched `NaN`, else `-1`. - */ - function indexOfNaN(array, fromIndex, fromRight) { - var length = array.length, - index = fromIndex + (fromRight ? 0 : -1); - - while ((fromRight ? index-- : ++index < length)) { - var other = array[index]; - if (other !== other) { - return index; - } - } - return -1; - } - - /** - * Checks if `value` is a host object in IE < 9. - * - * @private - * @param {*} value The value to check. - * @returns {boolean} Returns `true` if `value` is a host object, else `false`. - */ - function isHostObject(value) { - // Many host objects are `Object` objects that can coerce to strings - // despite having improperly defined `toString` methods. - var result = false; - if (value != null && typeof value.toString != 'function') { - try { - result = !!(value + ''); - } catch (e) {} - } - return result; - } - - /** - * Checks if `value` is a valid array-like index. - * - * @private - * @param {*} value The value to check. - * @param {number} [length=MAX_SAFE_INTEGER] The upper bounds of a valid index. - * @returns {boolean} Returns `true` if `value` is a valid index, else `false`. - */ - function isIndex(value, length) { - value = (typeof value == 'number' || reIsUint.test(value)) ? +value : -1; - length = length == null ? MAX_SAFE_INTEGER : length; - return value > -1 && value % 1 == 0 && value < length; - } - - /** - * Converts `iterator` to an array. - * - * @private - * @param {Object} iterator The iterator to convert. - * @returns {Array} Returns the converted array. - */ - function iteratorToArray(iterator) { - var data, - result = []; - - while (!(data = iterator.next()).done) { - result.push(data.value); - } - return result; - } - - /** - * Converts `map` to an array. - * - * @private - * @param {Object} map The map to convert. - * @returns {Array} Returns the converted array. - */ - function mapToArray(map) { - var index = -1, - result = Array(map.size); - - map.forEach(function(value, key) { - result[++index] = [key, value]; - }); - return result; - } - - /** - * Replaces all `placeholder` elements in `array` with an internal placeholder - * and returns an array of their indexes. - * - * @private - * @param {Array} array The array to modify. - * @param {*} placeholder The placeholder to replace. - * @returns {Array} Returns the new array of placeholder indexes. - */ - function replaceHolders(array, placeholder) { - var index = -1, - length = array.length, - resIndex = 0, - result = []; - - while (++index < length) { - var value = array[index]; - if (value === placeholder || value === PLACEHOLDER) { - array[index] = PLACEHOLDER; - result[resIndex++] = index; - } - } - return result; - } - - /** - * Converts `set` to an array. - * - * @private - * @param {Object} set The set to convert. - * @returns {Array} Returns the converted array. - */ - function setToArray(set) { - var index = -1, - result = Array(set.size); - - set.forEach(function(value) { - result[++index] = value; - }); - return result; - } - - /** - * Gets the number of symbols in `string`. - * - * @private - * @param {string} string The string to inspect. - * @returns {number} Returns the string size. - */ - function stringSize(string) { - if (!(string && reHasComplexSymbol.test(string))) { - return string.length; - } - var result = reComplexSymbol.lastIndex = 0; - while (reComplexSymbol.test(string)) { - result++; - } - return result; - } - - /** - * Converts `string` to an array. - * - * @private - * @param {string} string The string to convert. - * @returns {Array} Returns the converted array. - */ - function stringToArray(string) { - return string.match(reComplexSymbol); - } - - /** - * Used by `_.unescape` to convert HTML entities to characters. - * - * @private - * @param {string} chr The matched character to unescape. - * @returns {string} Returns the unescaped character. - */ - function unescapeHtmlChar(chr) { - return htmlUnescapes[chr]; - } - - /*--------------------------------------------------------------------------*/ - - /** - * Create a new pristine `lodash` function using the `context` object. - * - * @static - * @memberOf _ - * @category Util - * @param {Object} [context=root] The context object. - * @returns {Function} Returns a new `lodash` function. - * @example - * - * _.mixin({ 'foo': _.constant('foo') }); - * - * var lodash = _.runInContext(); - * lodash.mixin({ 'bar': lodash.constant('bar') }); - * - * _.isFunction(_.foo); - * // => true - * _.isFunction(_.bar); - * // => false - * - * lodash.isFunction(lodash.foo); - * // => false - * lodash.isFunction(lodash.bar); - * // => true - * - * // Use `context` to mock `Date#getTime` use in `_.now`. - * var mock = _.runInContext({ - * 'Date': function() { - * return { 'getTime': getTimeMock }; - * } - * }); - * - * // Create a suped-up `defer` in Node.js. - * var defer = _.runInContext({ 'setTimeout': setImmediate }).defer; - */ - function runInContext(context) { - context = context ? _.defaults({}, context, _.pick(root, contextProps)) : root; - - /** Built-in constructor references. */ - var Date = context.Date, - Error = context.Error, - Math = context.Math, - RegExp = context.RegExp, - TypeError = context.TypeError; - - /** Used for built-in method references. */ - var arrayProto = context.Array.prototype, - objectProto = context.Object.prototype; - - /** Used to resolve the decompiled source of functions. */ - var funcToString = context.Function.prototype.toString; - - /** Used to check objects for own properties. */ - var hasOwnProperty = objectProto.hasOwnProperty; - - /** Used to generate unique IDs. */ - var idCounter = 0; - - /** Used to infer the `Object` constructor. */ - var objectCtorString = funcToString.call(Object); - - /** - * Used to resolve the [`toStringTag`](http://ecma-international.org/ecma-262/6.0/#sec-object.prototype.tostring) - * of values. - */ - var objectToString = objectProto.toString; - - /** Used to restore the original `_` reference in `_.noConflict`. */ - var oldDash = root._; - - /** Used to detect if a method is native. */ - var reIsNative = RegExp('^' + - funcToString.call(hasOwnProperty).replace(reRegExpChar, '\\$&') - .replace(/hasOwnProperty|(function).*?(?=\\\()| for .+?(?=\\\])/g, '$1.*?') + '$' - ); - - /** Built-in value references. */ - var Buffer = moduleExports ? context.Buffer : undefined, - Reflect = context.Reflect, - Symbol = context.Symbol, - Uint8Array = context.Uint8Array, - clearTimeout = context.clearTimeout, - enumerate = Reflect ? Reflect.enumerate : undefined, - getPrototypeOf = Object.getPrototypeOf, - getOwnPropertySymbols = Object.getOwnPropertySymbols, - iteratorSymbol = typeof (iteratorSymbol = Symbol && Symbol.iterator) == 'symbol' ? iteratorSymbol : undefined, - objectCreate = Object.create, - propertyIsEnumerable = objectProto.propertyIsEnumerable, - setTimeout = context.setTimeout, - splice = arrayProto.splice; - - /* Built-in method references for those with the same name as other `lodash` methods. */ - var nativeCeil = Math.ceil, - nativeFloor = Math.floor, - nativeIsFinite = context.isFinite, - nativeJoin = arrayProto.join, - nativeKeys = Object.keys, - nativeMax = Math.max, - nativeMin = Math.min, - nativeParseInt = context.parseInt, - nativeRandom = Math.random, - nativeReverse = arrayProto.reverse; - - /* Built-in method references that are verified to be native. */ - var Map = getNative(context, 'Map'), - Set = getNative(context, 'Set'), - WeakMap = getNative(context, 'WeakMap'), - nativeCreate = getNative(Object, 'create'); - - /** Used to store function metadata. */ - var metaMap = WeakMap && new WeakMap; - - /** Detect if properties shadowing those on `Object.prototype` are non-enumerable. */ - var nonEnumShadows = !propertyIsEnumerable.call({ 'valueOf': 1 }, 'valueOf'); - - /** Used to lookup unminified function names. */ - var realNames = {}; - - /** Used to detect maps, sets, and weakmaps. */ - var mapCtorString = Map ? funcToString.call(Map) : '', - setCtorString = Set ? funcToString.call(Set) : '', - weakMapCtorString = WeakMap ? funcToString.call(WeakMap) : ''; - - /** Used to convert symbols to primitives and strings. */ - var symbolProto = Symbol ? Symbol.prototype : undefined, - symbolValueOf = symbolProto ? symbolProto.valueOf : undefined, - symbolToString = symbolProto ? symbolProto.toString : undefined; - - /*------------------------------------------------------------------------*/ - - /** - * Creates a `lodash` object which wraps `value` to enable implicit method - * chaining. Methods that operate on and return arrays, collections, and - * functions can be chained together. Methods that retrieve a single value or - * may return a primitive value will automatically end the chain sequence and - * return the unwrapped value. Otherwise, the value must be unwrapped with - * `_#value`. - * - * Explicit chaining, which must be unwrapped with `_#value` in all cases, - * may be enabled using `_.chain`. - * - * The execution of chained methods is lazy, that is, it's deferred until - * `_#value` is implicitly or explicitly called. - * - * Lazy evaluation allows several methods to support shortcut fusion. Shortcut - * fusion is an optimization to merge iteratee calls; this avoids the creation - * of intermediate arrays and can greatly reduce the number of iteratee executions. - * Sections of a chain sequence qualify for shortcut fusion if the section is - * applied to an array of at least two hundred elements and any iteratees - * accept only one argument. The heuristic for whether a section qualifies - * for shortcut fusion is subject to change. - * - * Chaining is supported in custom builds as long as the `_#value` method is - * directly or indirectly included in the build. - * - * In addition to lodash methods, wrappers have `Array` and `String` methods. - * - * The wrapper `Array` methods are: - * `concat`, `join`, `pop`, `push`, `shift`, `sort`, `splice`, and `unshift` - * - * The wrapper `String` methods are: - * `replace` and `split` - * - * The wrapper methods that support shortcut fusion are: - * `at`, `compact`, `drop`, `dropRight`, `dropWhile`, `filter`, `find`, - * `findLast`, `head`, `initial`, `last`, `map`, `reject`, `reverse`, `slice`, - * `tail`, `take`, `takeRight`, `takeRightWhile`, `takeWhile`, and `toArray` - * - * The chainable wrapper methods are: - * `after`, `ary`, `assign`, `assignIn`, `assignInWith`, `assignWith`, `at`, - * `before`, `bind`, `bindAll`, `bindKey`, `castArray`, `chain`, `chunk`, - * `commit`, `compact`, `concat`, `conforms`, `constant`, `countBy`, `create`, - * `curry`, `debounce`, `defaults`, `defaultsDeep`, `defer`, `delay`, - * `difference`, `differenceBy`, `differenceWith`, `drop`, `dropRight`, - * `dropRightWhile`, `dropWhile`, `extend`, `extendWith`, `fill`, `filter`, - * `flatten`, `flattenDeep`, `flattenDepth`, `flip`, `flow`, `flowRight`, - * `fromPairs`, `functions`, `functionsIn`, `groupBy`, `initial`, `intersection`, - * `intersectionBy`, `intersectionWith`, `invert`, `invertBy`, `invokeMap`, - * `iteratee`, `keyBy`, `keys`, `keysIn`, `map`, `mapKeys`, `mapValues`, - * `matches`, `matchesProperty`, `memoize`, `merge`, `mergeWith`, `method`, - * `methodOf`, `mixin`, `negate`, `nthArg`, `omit`, `omitBy`, `once`, `orderBy`, - * `over`, `overArgs`, `overEvery`, `overSome`, `partial`, `partialRight`, - * `partition`, `pick`, `pickBy`, `plant`, `property`, `propertyOf`, `pull`, - * `pullAll`, `pullAllBy`, `pullAllWith`, `pullAt`, `push`, `range`, - * `rangeRight`, `rearg`, `reject`, `remove`, `rest`, `reverse`, `sampleSize`, - * `set`, `setWith`, `shuffle`, `slice`, `sort`, `sortBy`, `splice`, `spread`, - * `tail`, `take`, `takeRight`, `takeRightWhile`, `takeWhile`, `tap`, `throttle`, - * `thru`, `toArray`, `toPairs`, `toPairsIn`, `toPath`, `toPlainObject`, - * `transform`, `unary`, `union`, `unionBy`, `unionWith`, `uniq`, `uniqBy`, - * `uniqWith`, `unset`, `unshift`, `unzip`, `unzipWith`, `update`, `values`, - * `valuesIn`, `without`, `wrap`, `xor`, `xorBy`, `xorWith`, `zip`, `zipObject`, - * `zipObjectDeep`, and `zipWith` - * - * The wrapper methods that are **not** chainable by default are: - * `add`, `attempt`, `camelCase`, `capitalize`, `ceil`, `clamp`, `clone`, - * `cloneDeep`, `cloneDeepWith`, `cloneWith`, `deburr`, `each`, `eachRight`, - * `endsWith`, `eq`, `escape`, `escapeRegExp`, `every`, `find`, `findIndex`, - * `findKey`, `findLast`, `findLastIndex`, `findLastKey`, `first`, `floor`, - * `forEach`, `forEachRight`, `forIn`, `forInRight`, `forOwn`, `forOwnRight`, - * `get`, `gt`, `gte`, `has`, `hasIn`, `head`, `identity`, `includes`, - * `indexOf`, `inRange`, `invoke`, `isArguments`, `isArray`, `isArrayBuffer`, - * `isArrayLike`, `isArrayLikeObject`, `isBoolean`, `isBuffer`, `isDate`, - * `isElement`, `isEmpty`, `isEqual`, `isEqualWith`, `isError`, `isFinite`, - * `isFunction`, `isInteger`, `isLength`, `isMap`, `isMatch`, `isMatchWith`, - * `isNaN`, `isNative`, `isNil`, `isNull`, `isNumber`, `isObject`, `isObjectLike`, - * `isPlainObject`, `isRegExp`, `isSafeInteger`, `isSet`, `isString`, - * `isUndefined`, `isTypedArray`, `isWeakMap`, `isWeakSet`, `join`, `kebabCase`, - * `last`, `lastIndexOf`, `lowerCase`, `lowerFirst`, `lt`, `lte`, `max`, - * `maxBy`, `mean`, `min`, `minBy`, `noConflict`, `noop`, `now`, `pad`, - * `padEnd`, `padStart`, `parseInt`, `pop`, `random`, `reduce`, `reduceRight`, - * `repeat`, `result`, `round`, `runInContext`, `sample`, `shift`, `size`, - * `snakeCase`, `some`, `sortedIndex`, `sortedIndexBy`, `sortedLastIndex`, - * `sortedLastIndexBy`, `startCase`, `startsWith`, `subtract`, `sum`, `sumBy`, - * `template`, `times`, `toInteger`, `toJSON`, `toLength`, `toLower`, - * `toNumber`, `toSafeInteger`, `toString`, `toUpper`, `trim`, `trimEnd`, - * `trimStart`, `truncate`, `unescape`, `uniqueId`, `upperCase`, `upperFirst`, - * `value`, and `words` - * - * @name _ - * @constructor - * @category Seq - * @param {*} value The value to wrap in a `lodash` instance. - * @returns {Object} Returns the new `lodash` wrapper instance. - * @example - * - * function square(n) { - * return n * n; - * } - * - * var wrapped = _([1, 2, 3]); - * - * // Returns an unwrapped value. - * wrapped.reduce(_.add); - * // => 6 - * - * // Returns a wrapped value. - * var squares = wrapped.map(square); - * - * _.isArray(squares); - * // => false - * - * _.isArray(squares.value()); - * // => true - */ - function lodash(value) { - if (isObjectLike(value) && !isArray(value) && !(value instanceof LazyWrapper)) { - if (value instanceof LodashWrapper) { - return value; - } - if (hasOwnProperty.call(value, '__wrapped__')) { - return wrapperClone(value); - } - } - return new LodashWrapper(value); - } - - /** - * The function whose prototype all chaining wrappers inherit from. - * - * @private - */ - function baseLodash() { - // No operation performed. - } - - /** - * The base constructor for creating `lodash` wrapper objects. - * - * @private - * @param {*} value The value to wrap. - * @param {boolean} [chainAll] Enable chaining for all wrapper methods. - */ - function LodashWrapper(value, chainAll) { - this.__wrapped__ = value; - this.__actions__ = []; - this.__chain__ = !!chainAll; - this.__index__ = 0; - this.__values__ = undefined; - } - - /** - * By default, the template delimiters used by lodash are like those in - * embedded Ruby (ERB). Change the following template settings to use - * alternative delimiters. - * - * @static - * @memberOf _ - * @type {Object} - */ - lodash.templateSettings = { - - /** - * Used to detect `data` property values to be HTML-escaped. - * - * @memberOf _.templateSettings - * @type {RegExp} - */ - 'escape': reEscape, - - /** - * Used to detect code to be evaluated. - * - * @memberOf _.templateSettings - * @type {RegExp} - */ - 'evaluate': reEvaluate, - - /** - * Used to detect `data` property values to inject. - * - * @memberOf _.templateSettings - * @type {RegExp} - */ - 'interpolate': reInterpolate, - - /** - * Used to reference the data object in the template text. - * - * @memberOf _.templateSettings - * @type {string} - */ - 'variable': '', - - /** - * Used to import variables into the compiled template. - * - * @memberOf _.templateSettings - * @type {Object} - */ - 'imports': { - - /** - * A reference to the `lodash` function. - * - * @memberOf _.templateSettings.imports - * @type {Function} - */ - '_': lodash - } - }; - - /*------------------------------------------------------------------------*/ - - /** - * Creates a lazy wrapper object which wraps `value` to enable lazy evaluation. - * - * @private - * @constructor - * @param {*} value The value to wrap. - */ - function LazyWrapper(value) { - this.__wrapped__ = value; - this.__actions__ = []; - this.__dir__ = 1; - this.__filtered__ = false; - this.__iteratees__ = []; - this.__takeCount__ = MAX_ARRAY_LENGTH; - this.__views__ = []; - } - - /** - * Creates a clone of the lazy wrapper object. - * - * @private - * @name clone - * @memberOf LazyWrapper - * @returns {Object} Returns the cloned `LazyWrapper` object. - */ - function lazyClone() { - var result = new LazyWrapper(this.__wrapped__); - result.__actions__ = copyArray(this.__actions__); - result.__dir__ = this.__dir__; - result.__filtered__ = this.__filtered__; - result.__iteratees__ = copyArray(this.__iteratees__); - result.__takeCount__ = this.__takeCount__; - result.__views__ = copyArray(this.__views__); - return result; - } - - /** - * Reverses the direction of lazy iteration. - * - * @private - * @name reverse - * @memberOf LazyWrapper - * @returns {Object} Returns the new reversed `LazyWrapper` object. - */ - function lazyReverse() { - if (this.__filtered__) { - var result = new LazyWrapper(this); - result.__dir__ = -1; - result.__filtered__ = true; - } else { - result = this.clone(); - result.__dir__ *= -1; - } - return result; - } - - /** - * Extracts the unwrapped value from its lazy wrapper. - * - * @private - * @name value - * @memberOf LazyWrapper - * @returns {*} Returns the unwrapped value. - */ - function lazyValue() { - var array = this.__wrapped__.value(), - dir = this.__dir__, - isArr = isArray(array), - isRight = dir < 0, - arrLength = isArr ? array.length : 0, - view = getView(0, arrLength, this.__views__), - start = view.start, - end = view.end, - length = end - start, - index = isRight ? end : (start - 1), - iteratees = this.__iteratees__, - iterLength = iteratees.length, - resIndex = 0, - takeCount = nativeMin(length, this.__takeCount__); - - if (!isArr || arrLength < LARGE_ARRAY_SIZE || - (arrLength == length && takeCount == length)) { - return baseWrapperValue(array, this.__actions__); - } - var result = []; - - outer: - while (length-- && resIndex < takeCount) { - index += dir; - - var iterIndex = -1, - value = array[index]; - - while (++iterIndex < iterLength) { - var data = iteratees[iterIndex], - iteratee = data.iteratee, - type = data.type, - computed = iteratee(value); - - if (type == LAZY_MAP_FLAG) { - value = computed; - } else if (!computed) { - if (type == LAZY_FILTER_FLAG) { - continue outer; - } else { - break outer; - } - } - } - result[resIndex++] = value; - } - return result; - } - - /*------------------------------------------------------------------------*/ - - /** - * Creates an hash object. - * - * @private - * @constructor - * @returns {Object} Returns the new hash object. - */ - function Hash() {} - - /** - * Removes `key` and its value from the hash. - * - * @private - * @param {Object} hash The hash to modify. - * @param {string} key The key of the value to remove. - * @returns {boolean} Returns `true` if the entry was removed, else `false`. - */ - function hashDelete(hash, key) { - return hashHas(hash, key) && delete hash[key]; - } - - /** - * Gets the hash value for `key`. - * - * @private - * @param {Object} hash The hash to query. - * @param {string} key The key of the value to get. - * @returns {*} Returns the entry value. - */ - function hashGet(hash, key) { - if (nativeCreate) { - var result = hash[key]; - return result === HASH_UNDEFINED ? undefined : result; - } - return hasOwnProperty.call(hash, key) ? hash[key] : undefined; - } - - /** - * Checks if a hash value for `key` exists. - * - * @private - * @param {Object} hash The hash to query. - * @param {string} key The key of the entry to check. - * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`. - */ - function hashHas(hash, key) { - return nativeCreate ? hash[key] !== undefined : hasOwnProperty.call(hash, key); - } - - /** - * Sets the hash `key` to `value`. - * - * @private - * @param {Object} hash The hash to modify. - * @param {string} key The key of the value to set. - * @param {*} value The value to set. - */ - function hashSet(hash, key, value) { - hash[key] = (nativeCreate && value === undefined) ? HASH_UNDEFINED : value; - } - - /*------------------------------------------------------------------------*/ - - /** - * Creates a map cache object to store key-value pairs. - * - * @private - * @constructor - * @param {Array} [values] The values to cache. - */ - function MapCache(values) { - var index = -1, - length = values ? values.length : 0; - - this.clear(); - while (++index < length) { - var entry = values[index]; - this.set(entry[0], entry[1]); - } - } - - /** - * Removes all key-value entries from the map. - * - * @private - * @name clear - * @memberOf MapCache - */ - function mapClear() { - this.__data__ = { - 'hash': new Hash, - 'map': Map ? new Map : [], - 'string': new Hash - }; - } - - /** - * Removes `key` and its value from the map. - * - * @private - * @name delete - * @memberOf MapCache - * @param {string} key The key of the value to remove. - * @returns {boolean} Returns `true` if the entry was removed, else `false`. - */ - function mapDelete(key) { - var data = this.__data__; - if (isKeyable(key)) { - return hashDelete(typeof key == 'string' ? data.string : data.hash, key); - } - return Map ? data.map['delete'](key) : assocDelete(data.map, key); - } - - /** - * Gets the map value for `key`. - * - * @private - * @name get - * @memberOf MapCache - * @param {string} key The key of the value to get. - * @returns {*} Returns the entry value. - */ - function mapGet(key) { - var data = this.__data__; - if (isKeyable(key)) { - return hashGet(typeof key == 'string' ? data.string : data.hash, key); - } - return Map ? data.map.get(key) : assocGet(data.map, key); - } - - /** - * Checks if a map value for `key` exists. - * - * @private - * @name has - * @memberOf MapCache - * @param {string} key The key of the entry to check. - * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`. - */ - function mapHas(key) { - var data = this.__data__; - if (isKeyable(key)) { - return hashHas(typeof key == 'string' ? data.string : data.hash, key); - } - return Map ? data.map.has(key) : assocHas(data.map, key); - } - - /** - * Sets the map `key` to `value`. - * - * @private - * @name set - * @memberOf MapCache - * @param {string} key The key of the value to set. - * @param {*} value The value to set. - * @returns {Object} Returns the map cache object. - */ - function mapSet(key, value) { - var data = this.__data__; - if (isKeyable(key)) { - hashSet(typeof key == 'string' ? data.string : data.hash, key, value); - } else if (Map) { - data.map.set(key, value); - } else { - assocSet(data.map, key, value); - } - return this; - } - - /*------------------------------------------------------------------------*/ - - /** - * - * Creates a set cache object to store unique values. - * - * @private - * @constructor - * @param {Array} [values] The values to cache. - */ - function SetCache(values) { - var index = -1, - length = values ? values.length : 0; - - this.__data__ = new MapCache; - while (++index < length) { - this.push(values[index]); - } - } - - /** - * Checks if `value` is in `cache`. - * - * @private - * @param {Object} cache The set cache to search. - * @param {*} value The value to search for. - * @returns {number} Returns `true` if `value` is found, else `false`. - */ - function cacheHas(cache, value) { - var map = cache.__data__; - if (isKeyable(value)) { - var data = map.__data__, - hash = typeof value == 'string' ? data.string : data.hash; - - return hash[value] === HASH_UNDEFINED; - } - return map.has(value); - } - - /** - * Adds `value` to the set cache. - * - * @private - * @name push - * @memberOf SetCache - * @param {*} value The value to cache. - */ - function cachePush(value) { - var map = this.__data__; - if (isKeyable(value)) { - var data = map.__data__, - hash = typeof value == 'string' ? data.string : data.hash; - - hash[value] = HASH_UNDEFINED; - } - else { - map.set(value, HASH_UNDEFINED); - } - } - - /*------------------------------------------------------------------------*/ - - /** - * Creates a stack cache object to store key-value pairs. - * - * @private - * @constructor - * @param {Array} [values] The values to cache. - */ - function Stack(values) { - var index = -1, - length = values ? values.length : 0; - - this.clear(); - while (++index < length) { - var entry = values[index]; - this.set(entry[0], entry[1]); - } - } - - /** - * Removes all key-value entries from the stack. - * - * @private - * @name clear - * @memberOf Stack - */ - function stackClear() { - this.__data__ = { 'array': [], 'map': null }; - } - - /** - * Removes `key` and its value from the stack. - * - * @private - * @name delete - * @memberOf Stack - * @param {string} key The key of the value to remove. - * @returns {boolean} Returns `true` if the entry was removed, else `false`. - */ - function stackDelete(key) { - var data = this.__data__, - array = data.array; - - return array ? assocDelete(array, key) : data.map['delete'](key); - } - - /** - * Gets the stack value for `key`. - * - * @private - * @name get - * @memberOf Stack - * @param {string} key The key of the value to get. - * @returns {*} Returns the entry value. - */ - function stackGet(key) { - var data = this.__data__, - array = data.array; - - return array ? assocGet(array, key) : data.map.get(key); - } - - /** - * Checks if a stack value for `key` exists. - * - * @private - * @name has - * @memberOf Stack - * @param {string} key The key of the entry to check. - * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`. - */ - function stackHas(key) { - var data = this.__data__, - array = data.array; - - return array ? assocHas(array, key) : data.map.has(key); - } - - /** - * Sets the stack `key` to `value`. - * - * @private - * @name set - * @memberOf Stack - * @param {string} key The key of the value to set. - * @param {*} value The value to set. - * @returns {Object} Returns the stack cache object. - */ - function stackSet(key, value) { - var data = this.__data__, - array = data.array; - - if (array) { - if (array.length < (LARGE_ARRAY_SIZE - 1)) { - assocSet(array, key, value); - } else { - data.array = null; - data.map = new MapCache(array); - } - } - var map = data.map; - if (map) { - map.set(key, value); - } - return this; - } - - /*------------------------------------------------------------------------*/ - - /** - * Removes `key` and its value from the associative array. - * - * @private - * @param {Array} array The array to query. - * @param {string} key The key of the value to remove. - * @returns {boolean} Returns `true` if the entry was removed, else `false`. - */ - function assocDelete(array, key) { - var index = assocIndexOf(array, key); - if (index < 0) { - return false; - } - var lastIndex = array.length - 1; - if (index == lastIndex) { - array.pop(); - } else { - splice.call(array, index, 1); - } - return true; - } - - /** - * Gets the associative array value for `key`. - * - * @private - * @param {Array} array The array to query. - * @param {string} key The key of the value to get. - * @returns {*} Returns the entry value. - */ - function assocGet(array, key) { - var index = assocIndexOf(array, key); - return index < 0 ? undefined : array[index][1]; - } - - /** - * Checks if an associative array value for `key` exists. - * - * @private - * @param {Array} array The array to query. - * @param {string} key The key of the entry to check. - * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`. - */ - function assocHas(array, key) { - return assocIndexOf(array, key) > -1; - } - - /** - * Gets the index at which the first occurrence of `key` is found in `array` - * of key-value pairs. - * - * @private - * @param {Array} array The array to search. - * @param {*} key The key to search for. - * @returns {number} Returns the index of the matched value, else `-1`. - */ - function assocIndexOf(array, key) { - var length = array.length; - while (length--) { - if (eq(array[length][0], key)) { - return length; - } - } - return -1; - } - - /** - * Sets the associative array `key` to `value`. - * - * @private - * @param {Array} array The array to modify. - * @param {string} key The key of the value to set. - * @param {*} value The value to set. - */ - function assocSet(array, key, value) { - var index = assocIndexOf(array, key); - if (index < 0) { - array.push([key, value]); - } else { - array[index][1] = value; - } - } - - /*------------------------------------------------------------------------*/ - - /** - * Used by `_.defaults` to customize its `_.assignIn` use. - * - * @private - * @param {*} objValue The destination value. - * @param {*} srcValue The source value. - * @param {string} key The key of the property to assign. - * @param {Object} object The parent object of `objValue`. - * @returns {*} Returns the value to assign. - */ - function assignInDefaults(objValue, srcValue, key, object) { - if (objValue === undefined || - (eq(objValue, objectProto[key]) && !hasOwnProperty.call(object, key))) { - return srcValue; - } - return objValue; - } - - /** - * This function is like `assignValue` except that it doesn't assign - * `undefined` values. - * - * @private - * @param {Object} object The object to modify. - * @param {string} key The key of the property to assign. - * @param {*} value The value to assign. - */ - function assignMergeValue(object, key, value) { - if ((value !== undefined && !eq(object[key], value)) || - (typeof key == 'number' && value === undefined && !(key in object))) { - object[key] = value; - } - } - - /** - * Assigns `value` to `key` of `object` if the existing value is not equivalent - * using [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero) - * for equality comparisons. - * - * @private - * @param {Object} object The object to modify. - * @param {string} key The key of the property to assign. - * @param {*} value The value to assign. - */ - function assignValue(object, key, value) { - var objValue = object[key]; - if (!(hasOwnProperty.call(object, key) && eq(objValue, value)) || - (value === undefined && !(key in object))) { - object[key] = value; - } - } - - /** - * Aggregates elements of `collection` on `accumulator` with keys transformed - * by `iteratee` and values set by `setter`. - * - * @private - * @param {Array|Object} collection The collection to iterate over. - * @param {Function} setter The function to set `accumulator` values. - * @param {Function} iteratee The iteratee to transform keys. - * @param {Object} accumulator The initial aggregated object. - * @returns {Function} Returns `accumulator`. - */ - function baseAggregator(collection, setter, iteratee, accumulator) { - baseEach(collection, function(value, key, collection) { - setter(accumulator, value, iteratee(value), collection); - }); - return accumulator; - } - - /** - * The base implementation of `_.assign` without support for multiple sources - * or `customizer` functions. - * - * @private - * @param {Object} object The destination object. - * @param {Object} source The source object. - * @returns {Object} Returns `object`. - */ - function baseAssign(object, source) { - return object && copyObject(source, keys(source), object); - } - - /** - * The base implementation of `_.at` without support for individual paths. - * - * @private - * @param {Object} object The object to iterate over. - * @param {string[]} paths The property paths of elements to pick. - * @returns {Array} Returns the new array of picked elements. - */ - function baseAt(object, paths) { - var index = -1, - isNil = object == null, - length = paths.length, - result = Array(length); - - while (++index < length) { - result[index] = isNil ? undefined : get(object, paths[index]); - } - return result; - } - - /** - * Casts `value` to an empty array if it's not an array like object. - * - * @private - * @param {*} value The value to inspect. - * @returns {Array} Returns the array-like object. - */ - function baseCastArrayLikeObject(value) { - return isArrayLikeObject(value) ? value : []; - } - - /** - * Casts `value` to `identity` if it's not a function. - * - * @private - * @param {*} value The value to inspect. - * @returns {Array} Returns the array-like object. - */ - function baseCastFunction(value) { - return typeof value == 'function' ? value : identity; - } - - /** - * Casts `value` to a path array if it's not one. - * - * @private - * @param {*} value The value to inspect. - * @returns {Array} Returns the cast property path array. - */ - function baseCastPath(value) { - return isArray(value) ? value : stringToPath(value); - } - - /** - * The base implementation of `_.clamp` which doesn't coerce arguments to numbers. - * - * @private - * @param {number} number The number to clamp. - * @param {number} [lower] The lower bound. - * @param {number} upper The upper bound. - * @returns {number} Returns the clamped number. - */ - function baseClamp(number, lower, upper) { - if (number === number) { - if (upper !== undefined) { - number = number <= upper ? number : upper; - } - if (lower !== undefined) { - number = number >= lower ? number : lower; - } - } - return number; - } - - /** - * The base implementation of `_.clone` and `_.cloneDeep` which tracks - * traversed objects. - * - * @private - * @param {*} value The value to clone. - * @param {boolean} [isDeep] Specify a deep clone. - * @param {boolean} [isFull] Specify a clone including symbols. - * @param {Function} [customizer] The function to customize cloning. - * @param {string} [key] The key of `value`. - * @param {Object} [object] The parent object of `value`. - * @param {Object} [stack] Tracks traversed objects and their clone counterparts. - * @returns {*} Returns the cloned value. - */ - function baseClone(value, isDeep, isFull, customizer, key, object, stack) { - var result; - if (customizer) { - result = object ? customizer(value, key, object, stack) : customizer(value); - } - if (result !== undefined) { - return result; - } - if (!isObject(value)) { - return value; - } - var isArr = isArray(value); - if (isArr) { - result = initCloneArray(value); - if (!isDeep) { - return copyArray(value, result); - } - } else { - var tag = getTag(value), - isFunc = tag == funcTag || tag == genTag; - - if (isBuffer(value)) { - return cloneBuffer(value, isDeep); - } - if (tag == objectTag || tag == argsTag || (isFunc && !object)) { - if (isHostObject(value)) { - return object ? value : {}; - } - result = initCloneObject(isFunc ? {} : value); - if (!isDeep) { - result = baseAssign(result, value); - return isFull ? copySymbols(value, result) : result; - } - } else { - if (!cloneableTags[tag]) { - return object ? value : {}; - } - result = initCloneByTag(value, tag, isDeep); - } - } - // Check for circular references and return its corresponding clone. - stack || (stack = new Stack); - var stacked = stack.get(value); - if (stacked) { - return stacked; - } - stack.set(value, result); - - // Recursively populate clone (susceptible to call stack limits). - (isArr ? arrayEach : baseForOwn)(value, function(subValue, key) { - assignValue(result, key, baseClone(subValue, isDeep, isFull, customizer, key, value, stack)); - }); - return (isFull && !isArr) ? copySymbols(value, result) : result; - } - - /** - * The base implementation of `_.conforms` which doesn't clone `source`. - * - * @private - * @param {Object} source The object of property predicates to conform to. - * @returns {Function} Returns the new function. - */ - function baseConforms(source) { - var props = keys(source), - length = props.length; - - return function(object) { - if (object == null) { - return !length; - } - var index = length; - while (index--) { - var key = props[index], - predicate = source[key], - value = object[key]; - - if ((value === undefined && !(key in Object(object))) || !predicate(value)) { - return false; - } - } - return true; - }; - } - - /** - * The base implementation of `_.create` without support for assigning - * properties to the created object. - * - * @private - * @param {Object} prototype The object to inherit from. - * @returns {Object} Returns the new object. - */ - function baseCreate(proto) { - return isObject(proto) ? objectCreate(proto) : {}; - } - - /** - * The base implementation of `_.delay` and `_.defer` which accepts an array - * of `func` arguments. - * - * @private - * @param {Function} func The function to delay. - * @param {number} wait The number of milliseconds to delay invocation. - * @param {Object} args The arguments to provide to `func`. - * @returns {number} Returns the timer id. - */ - function baseDelay(func, wait, args) { - if (typeof func != 'function') { - throw new TypeError(FUNC_ERROR_TEXT); - } - return setTimeout(function() { func.apply(undefined, args); }, wait); - } - - /** - * The base implementation of methods like `_.difference` without support for - * excluding multiple arrays or iteratee shorthands. - * - * @private - * @param {Array} array The array to inspect. - * @param {Array} values The values to exclude. - * @param {Function} [iteratee] The iteratee invoked per element. - * @param {Function} [comparator] The comparator invoked per element. - * @returns {Array} Returns the new array of filtered values. - */ - function baseDifference(array, values, iteratee, comparator) { - var index = -1, - includes = arrayIncludes, - isCommon = true, - length = array.length, - result = [], - valuesLength = values.length; - - if (!length) { - return result; - } - if (iteratee) { - values = arrayMap(values, baseUnary(iteratee)); - } - if (comparator) { - includes = arrayIncludesWith; - isCommon = false; - } - else if (values.length >= LARGE_ARRAY_SIZE) { - includes = cacheHas; - isCommon = false; - values = new SetCache(values); - } - outer: - while (++index < length) { - var value = array[index], - computed = iteratee ? iteratee(value) : value; - - if (isCommon && computed === computed) { - var valuesIndex = valuesLength; - while (valuesIndex--) { - if (values[valuesIndex] === computed) { - continue outer; - } - } - result.push(value); - } - else if (!includes(values, computed, comparator)) { - result.push(value); - } - } - return result; - } - - /** - * The base implementation of `_.forEach` without support for iteratee shorthands. - * - * @private - * @param {Array|Object} collection The collection to iterate over. - * @param {Function} iteratee The function invoked per iteration. - * @returns {Array|Object} Returns `collection`. - */ - var baseEach = createBaseEach(baseForOwn); - - /** - * The base implementation of `_.forEachRight` without support for iteratee shorthands. - * - * @private - * @param {Array|Object} collection The collection to iterate over. - * @param {Function} iteratee The function invoked per iteration. - * @returns {Array|Object} Returns `collection`. - */ - var baseEachRight = createBaseEach(baseForOwnRight, true); - - /** - * The base implementation of `_.every` without support for iteratee shorthands. - * - * @private - * @param {Array|Object} collection The collection to iterate over. - * @param {Function} predicate The function invoked per iteration. - * @returns {boolean} Returns `true` if all elements pass the predicate check, else `false` - */ - function baseEvery(collection, predicate) { - var result = true; - baseEach(collection, function(value, index, collection) { - result = !!predicate(value, index, collection); - return result; - }); - return result; - } - - /** - * The base implementation of `_.fill` without an iteratee call guard. - * - * @private - * @param {Array} array The array to fill. - * @param {*} value The value to fill `array` with. - * @param {number} [start=0] The start position. - * @param {number} [end=array.length] The end position. - * @returns {Array} Returns `array`. - */ - function baseFill(array, value, start, end) { - var length = array.length; - - start = toInteger(start); - if (start < 0) { - start = -start > length ? 0 : (length + start); - } - end = (end === undefined || end > length) ? length : toInteger(end); - if (end < 0) { - end += length; - } - end = start > end ? 0 : toLength(end); - while (start < end) { - array[start++] = value; - } - return array; - } - - /** - * The base implementation of `_.filter` without support for iteratee shorthands. - * - * @private - * @param {Array|Object} collection The collection to iterate over. - * @param {Function} predicate The function invoked per iteration. - * @returns {Array} Returns the new filtered array. - */ - function baseFilter(collection, predicate) { - var result = []; - baseEach(collection, function(value, index, collection) { - if (predicate(value, index, collection)) { - result.push(value); - } - }); - return result; - } - - /** - * The base implementation of `_.flatten` with support for restricting flattening. - * - * @private - * @param {Array} array The array to flatten. - * @param {number} depth The maximum recursion depth. - * @param {boolean} [isStrict] Restrict flattening to arrays-like objects. - * @param {Array} [result=[]] The initial result value. - * @returns {Array} Returns the new flattened array. - */ - function baseFlatten(array, depth, isStrict, result) { - result || (result = []); - - var index = -1, - length = array.length; - - while (++index < length) { - var value = array[index]; - if (depth > 0 && isArrayLikeObject(value) && - (isStrict || isArray(value) || isArguments(value))) { - if (depth > 1) { - // Recursively flatten arrays (susceptible to call stack limits). - baseFlatten(value, depth - 1, isStrict, result); - } else { - arrayPush(result, value); - } - } else if (!isStrict) { - result[result.length] = value; - } - } - return result; - } - - /** - * The base implementation of `baseForIn` and `baseForOwn` which iterates - * over `object` properties returned by `keysFunc` invoking `iteratee` for - * each property. Iteratee functions may exit iteration early by explicitly - * returning `false`. - * - * @private - * @param {Object} object The object to iterate over. - * @param {Function} iteratee The function invoked per iteration. - * @param {Function} keysFunc The function to get the keys of `object`. - * @returns {Object} Returns `object`. - */ - var baseFor = createBaseFor(); - - /** - * This function is like `baseFor` except that it iterates over properties - * in the opposite order. - * - * @private - * @param {Object} object The object to iterate over. - * @param {Function} iteratee The function invoked per iteration. - * @param {Function} keysFunc The function to get the keys of `object`. - * @returns {Object} Returns `object`. - */ - var baseForRight = createBaseFor(true); - - /** - * The base implementation of `_.forIn` without support for iteratee shorthands. - * - * @private - * @param {Object} object The object to iterate over. - * @param {Function} iteratee The function invoked per iteration. - * @returns {Object} Returns `object`. - */ - function baseForIn(object, iteratee) { - return object == null ? object : baseFor(object, iteratee, keysIn); - } - - /** - * The base implementation of `_.forOwn` without support for iteratee shorthands. - * - * @private - * @param {Object} object The object to iterate over. - * @param {Function} iteratee The function invoked per iteration. - * @returns {Object} Returns `object`. - */ - function baseForOwn(object, iteratee) { - return object && baseFor(object, iteratee, keys); - } - - /** - * The base implementation of `_.forOwnRight` without support for iteratee shorthands. - * - * @private - * @param {Object} object The object to iterate over. - * @param {Function} iteratee The function invoked per iteration. - * @returns {Object} Returns `object`. - */ - function baseForOwnRight(object, iteratee) { - return object && baseForRight(object, iteratee, keys); - } - - /** - * The base implementation of `_.functions` which creates an array of - * `object` function property names filtered from `props`. - * - * @private - * @param {Object} object The object to inspect. - * @param {Array} props The property names to filter. - * @returns {Array} Returns the new array of filtered property names. - */ - function baseFunctions(object, props) { - return arrayFilter(props, function(key) { - return isFunction(object[key]); - }); - } - - /** - * The base implementation of `_.get` without support for default values. - * - * @private - * @param {Object} object The object to query. - * @param {Array|string} path The path of the property to get. - * @returns {*} Returns the resolved value. - */ - function baseGet(object, path) { - path = isKey(path, object) ? [path + ''] : baseCastPath(path); - - var index = 0, - length = path.length; - - while (object != null && index < length) { - object = object[path[index++]]; - } - return (index && index == length) ? object : undefined; - } - - /** - * The base implementation of `_.has` without support for deep paths. - * - * @private - * @param {Object} object The object to query. - * @param {Array|string} key The key to check. - * @returns {boolean} Returns `true` if `key` exists, else `false`. - */ - function baseHas(object, key) { - // Avoid a bug in IE 10-11 where objects with a [[Prototype]] of `null`, - // that are composed entirely of index properties, return `false` for - // `hasOwnProperty` checks of them. - return hasOwnProperty.call(object, key) || - (typeof object == 'object' && key in object && getPrototypeOf(object) === null); - } - - /** - * The base implementation of `_.hasIn` without support for deep paths. - * - * @private - * @param {Object} object The object to query. - * @param {Array|string} key The key to check. - * @returns {boolean} Returns `true` if `key` exists, else `false`. - */ - function baseHasIn(object, key) { - return key in Object(object); - } - - /** - * The base implementation of `_.inRange` which doesn't coerce arguments to numbers. - * - * @private - * @param {number} number The number to check. - * @param {number} start The start of the range. - * @param {number} end The end of the range. - * @returns {boolean} Returns `true` if `number` is in the range, else `false`. - */ - function baseInRange(number, start, end) { - return number >= nativeMin(start, end) && number < nativeMax(start, end); - } - - /** - * The base implementation of methods like `_.intersection`, without support - * for iteratee shorthands, that accepts an array of arrays to inspect. - * - * @private - * @param {Array} arrays The arrays to inspect. - * @param {Function} [iteratee] The iteratee invoked per element. - * @param {Function} [comparator] The comparator invoked per element. - * @returns {Array} Returns the new array of shared values. - */ - function baseIntersection(arrays, iteratee, comparator) { - var includes = comparator ? arrayIncludesWith : arrayIncludes, - length = arrays[0].length, - othLength = arrays.length, - othIndex = othLength, - caches = Array(othLength), - maxLength = Infinity, - result = []; - - while (othIndex--) { - var array = arrays[othIndex]; - if (othIndex && iteratee) { - array = arrayMap(array, baseUnary(iteratee)); - } - maxLength = nativeMin(array.length, maxLength); - caches[othIndex] = !comparator && (iteratee || (length >= 120 && array.length >= 120)) - ? new SetCache(othIndex && array) - : undefined; - } - array = arrays[0]; - - var index = -1, - seen = caches[0]; - - outer: - while (++index < length && result.length < maxLength) { - var value = array[index], - computed = iteratee ? iteratee(value) : value; - - if (!(seen - ? cacheHas(seen, computed) - : includes(result, computed, comparator) - )) { - othIndex = othLength; - while (--othIndex) { - var cache = caches[othIndex]; - if (!(cache - ? cacheHas(cache, computed) - : includes(arrays[othIndex], computed, comparator)) - ) { - continue outer; - } - } - if (seen) { - seen.push(computed); - } - result.push(value); - } - } - return result; - } - - /** - * The base implementation of `_.invert` and `_.invertBy` which inverts - * `object` with values transformed by `iteratee` and set by `setter`. - * - * @private - * @param {Object} object The object to iterate over. - * @param {Function} setter The function to set `accumulator` values. - * @param {Function} iteratee The iteratee to transform values. - * @param {Object} accumulator The initial inverted object. - * @returns {Function} Returns `accumulator`. - */ - function baseInverter(object, setter, iteratee, accumulator) { - baseForOwn(object, function(value, key, object) { - setter(accumulator, iteratee(value), key, object); - }); - return accumulator; - } - - /** - * The base implementation of `_.invoke` without support for individual - * method arguments. - * - * @private - * @param {Object} object The object to query. - * @param {Array|string} path The path of the method to invoke. - * @param {Array} args The arguments to invoke the method with. - * @returns {*} Returns the result of the invoked method. - */ - function baseInvoke(object, path, args) { - if (!isKey(path, object)) { - path = baseCastPath(path); - object = parent(object, path); - path = last(path); - } - var func = object == null ? object : object[path]; - return func == null ? undefined : apply(func, object, args); - } - - /** - * The base implementation of `_.isEqual` which supports partial comparisons - * and tracks traversed objects. - * - * @private - * @param {*} value The value to compare. - * @param {*} other The other value to compare. - * @param {Function} [customizer] The function to customize comparisons. - * @param {boolean} [bitmask] The bitmask of comparison flags. - * The bitmask may be composed of the following flags: - * 1 - Unordered comparison - * 2 - Partial comparison - * @param {Object} [stack] Tracks traversed `value` and `other` objects. - * @returns {boolean} Returns `true` if the values are equivalent, else `false`. - */ - function baseIsEqual(value, other, customizer, bitmask, stack) { - if (value === other) { - return true; - } - if (value == null || other == null || (!isObject(value) && !isObjectLike(other))) { - return value !== value && other !== other; - } - return baseIsEqualDeep(value, other, baseIsEqual, customizer, bitmask, stack); - } - - /** - * A specialized version of `baseIsEqual` for arrays and objects which performs - * deep comparisons and tracks traversed objects enabling objects with circular - * references to be compared. - * - * @private - * @param {Object} object The object to compare. - * @param {Object} other The other object to compare. - * @param {Function} equalFunc The function to determine equivalents of values. - * @param {Function} [customizer] The function to customize comparisons. - * @param {number} [bitmask] The bitmask of comparison flags. See `baseIsEqual` for more details. - * @param {Object} [stack] Tracks traversed `object` and `other` objects. - * @returns {boolean} Returns `true` if the objects are equivalent, else `false`. - */ - function baseIsEqualDeep(object, other, equalFunc, customizer, bitmask, stack) { - var objIsArr = isArray(object), - othIsArr = isArray(other), - objTag = arrayTag, - othTag = arrayTag; - - if (!objIsArr) { - objTag = getTag(object); - objTag = objTag == argsTag ? objectTag : objTag; - } - if (!othIsArr) { - othTag = getTag(other); - othTag = othTag == argsTag ? objectTag : othTag; - } - var objIsObj = objTag == objectTag && !isHostObject(object), - othIsObj = othTag == objectTag && !isHostObject(other), - isSameTag = objTag == othTag; - - if (isSameTag && !objIsObj) { - stack || (stack = new Stack); - return (objIsArr || isTypedArray(object)) - ? equalArrays(object, other, equalFunc, customizer, bitmask, stack) - : equalByTag(object, other, objTag, equalFunc, customizer, bitmask, stack); - } - if (!(bitmask & PARTIAL_COMPARE_FLAG)) { - var objIsWrapped = objIsObj && hasOwnProperty.call(object, '__wrapped__'), - othIsWrapped = othIsObj && hasOwnProperty.call(other, '__wrapped__'); - - if (objIsWrapped || othIsWrapped) { - stack || (stack = new Stack); - return equalFunc(objIsWrapped ? object.value() : object, othIsWrapped ? other.value() : other, customizer, bitmask, stack); - } - } - if (!isSameTag) { - return false; - } - stack || (stack = new Stack); - return equalObjects(object, other, equalFunc, customizer, bitmask, stack); - } - - /** - * The base implementation of `_.isMatch` without support for iteratee shorthands. - * - * @private - * @param {Object} object The object to inspect. - * @param {Object} source The object of property values to match. - * @param {Array} matchData The property names, values, and compare flags to match. - * @param {Function} [customizer] The function to customize comparisons. - * @returns {boolean} Returns `true` if `object` is a match, else `false`. - */ - function baseIsMatch(object, source, matchData, customizer) { - var index = matchData.length, - length = index, - noCustomizer = !customizer; - - if (object == null) { - return !length; - } - object = Object(object); - while (index--) { - var data = matchData[index]; - if ((noCustomizer && data[2]) - ? data[1] !== object[data[0]] - : !(data[0] in object) - ) { - return false; - } - } - while (++index < length) { - data = matchData[index]; - var key = data[0], - objValue = object[key], - srcValue = data[1]; - - if (noCustomizer && data[2]) { - if (objValue === undefined && !(key in object)) { - return false; - } - } else { - var stack = new Stack, - result = customizer ? customizer(objValue, srcValue, key, object, source, stack) : undefined; - - if (!(result === undefined - ? baseIsEqual(srcValue, objValue, customizer, UNORDERED_COMPARE_FLAG | PARTIAL_COMPARE_FLAG, stack) - : result - )) { - return false; - } - } - } - return true; - } - - /** - * The base implementation of `_.iteratee`. - * - * @private - * @param {*} [value=_.identity] The value to convert to an iteratee. - * @returns {Function} Returns the iteratee. - */ - function baseIteratee(value) { - var type = typeof value; - if (type == 'function') { - return value; - } - if (value == null) { - return identity; - } - if (type == 'object') { - return isArray(value) - ? baseMatchesProperty(value[0], value[1]) - : baseMatches(value); - } - return property(value); - } - - /** - * The base implementation of `_.keys` which doesn't skip the constructor - * property of prototypes or treat sparse arrays as dense. - * - * @private - * @param {Object} object The object to query. - * @returns {Array} Returns the array of property names. - */ - function baseKeys(object) { - return nativeKeys(Object(object)); - } - - /** - * The base implementation of `_.keysIn` which doesn't skip the constructor - * property of prototypes or treat sparse arrays as dense. - * - * @private - * @param {Object} object The object to query. - * @returns {Array} Returns the array of property names. - */ - function baseKeysIn(object) { - object = object == null ? object : Object(object); - - var result = []; - for (var key in object) { - result.push(key); - } - return result; - } - - // Fallback for IE < 9 with es6-shim. - if (enumerate && !propertyIsEnumerable.call({ 'valueOf': 1 }, 'valueOf')) { - baseKeysIn = function(object) { - return iteratorToArray(enumerate(object)); - }; - } - - /** - * The base implementation of `_.map` without support for iteratee shorthands. - * - * @private - * @param {Array|Object} collection The collection to iterate over. - * @param {Function} iteratee The function invoked per iteration. - * @returns {Array} Returns the new mapped array. - */ - function baseMap(collection, iteratee) { - var index = -1, - result = isArrayLike(collection) ? Array(collection.length) : []; - - baseEach(collection, function(value, key, collection) { - result[++index] = iteratee(value, key, collection); - }); - return result; - } - - /** - * The base implementation of `_.matches` which doesn't clone `source`. - * - * @private - * @param {Object} source The object of property values to match. - * @returns {Function} Returns the new function. - */ - function baseMatches(source) { - var matchData = getMatchData(source); - if (matchData.length == 1 && matchData[0][2]) { - var key = matchData[0][0], - value = matchData[0][1]; - - return function(object) { - if (object == null) { - return false; - } - return object[key] === value && - (value !== undefined || (key in Object(object))); - }; - } - return function(object) { - return object === source || baseIsMatch(object, source, matchData); - }; - } - - /** - * The base implementation of `_.matchesProperty` which doesn't clone `srcValue`. - * - * @private - * @param {string} path The path of the property to get. - * @param {*} srcValue The value to match. - * @returns {Function} Returns the new function. - */ - function baseMatchesProperty(path, srcValue) { - return function(object) { - var objValue = get(object, path); - return (objValue === undefined && objValue === srcValue) - ? hasIn(object, path) - : baseIsEqual(srcValue, objValue, undefined, UNORDERED_COMPARE_FLAG | PARTIAL_COMPARE_FLAG); - }; - } - - /** - * The base implementation of `_.merge` without support for multiple sources. - * - * @private - * @param {Object} object The destination object. - * @param {Object} source The source object. - * @param {number} srcIndex The index of `source`. - * @param {Function} [customizer] The function to customize merged values. - * @param {Object} [stack] Tracks traversed source values and their merged counterparts. - */ - function baseMerge(object, source, srcIndex, customizer, stack) { - if (object === source) { - return; - } - var props = (isArray(source) || isTypedArray(source)) - ? undefined - : keysIn(source); - - arrayEach(props || source, function(srcValue, key) { - if (props) { - key = srcValue; - srcValue = source[key]; - } - if (isObject(srcValue)) { - stack || (stack = new Stack); - baseMergeDeep(object, source, key, srcIndex, baseMerge, customizer, stack); - } - else { - var newValue = customizer - ? customizer(object[key], srcValue, (key + ''), object, source, stack) - : undefined; - - if (newValue === undefined) { - newValue = srcValue; - } - assignMergeValue(object, key, newValue); - } - }); - } - - /** - * A specialized version of `baseMerge` for arrays and objects which performs - * deep merges and tracks traversed objects enabling objects with circular - * references to be merged. - * - * @private - * @param {Object} object The destination object. - * @param {Object} source The source object. - * @param {string} key The key of the value to merge. - * @param {number} srcIndex The index of `source`. - * @param {Function} mergeFunc The function to merge values. - * @param {Function} [customizer] The function to customize assigned values. - * @param {Object} [stack] Tracks traversed source values and their merged counterparts. - */ - function baseMergeDeep(object, source, key, srcIndex, mergeFunc, customizer, stack) { - var objValue = object[key], - srcValue = source[key], - stacked = stack.get(srcValue); - - if (stacked) { - assignMergeValue(object, key, stacked); - return; - } - var newValue = customizer - ? customizer(objValue, srcValue, (key + ''), object, source, stack) - : undefined; - - var isCommon = newValue === undefined; - - if (isCommon) { - newValue = srcValue; - if (isArray(srcValue) || isTypedArray(srcValue)) { - if (isArray(objValue)) { - newValue = objValue; - } - else if (isArrayLikeObject(objValue)) { - newValue = copyArray(objValue); - } - else { - isCommon = false; - newValue = baseClone(srcValue, !customizer); - } - } - else if (isPlainObject(srcValue) || isArguments(srcValue)) { - if (isArguments(objValue)) { - newValue = toPlainObject(objValue); - } - else if (!isObject(objValue) || (srcIndex && isFunction(objValue))) { - isCommon = false; - newValue = baseClone(srcValue, !customizer); - } - else { - newValue = objValue; - } - } - else { - isCommon = false; - } - } - stack.set(srcValue, newValue); - - if (isCommon) { - // Recursively merge objects and arrays (susceptible to call stack limits). - mergeFunc(newValue, srcValue, srcIndex, customizer, stack); - } - stack['delete'](srcValue); - assignMergeValue(object, key, newValue); - } - - /** - * The base implementation of `_.orderBy` without param guards. - * - * @private - * @param {Array|Object} collection The collection to iterate over. - * @param {Function[]|Object[]|string[]} iteratees The iteratees to sort by. - * @param {string[]} orders The sort orders of `iteratees`. - * @returns {Array} Returns the new sorted array. - */ - function baseOrderBy(collection, iteratees, orders) { - var index = -1; - iteratees = arrayMap(iteratees.length ? iteratees : Array(1), getIteratee()); - - var result = baseMap(collection, function(value, key, collection) { - var criteria = arrayMap(iteratees, function(iteratee) { - return iteratee(value); - }); - return { 'criteria': criteria, 'index': ++index, 'value': value }; - }); - - return baseSortBy(result, function(object, other) { - return compareMultiple(object, other, orders); - }); - } - - /** - * The base implementation of `_.pick` without support for individual - * property names. - * - * @private - * @param {Object} object The source object. - * @param {string[]} props The property names to pick. - * @returns {Object} Returns the new object. - */ - function basePick(object, props) { - object = Object(object); - return arrayReduce(props, function(result, key) { - if (key in object) { - result[key] = object[key]; - } - return result; - }, {}); - } - - /** - * The base implementation of `_.pickBy` without support for iteratee shorthands. - * - * @private - * @param {Object} object The source object. - * @param {Function} predicate The function invoked per property. - * @returns {Object} Returns the new object. - */ - function basePickBy(object, predicate) { - var result = {}; - baseForIn(object, function(value, key) { - if (predicate(value, key)) { - result[key] = value; - } - }); - return result; - } - - /** - * The base implementation of `_.property` without support for deep paths. - * - * @private - * @param {string} key The key of the property to get. - * @returns {Function} Returns the new function. - */ - function baseProperty(key) { - return function(object) { - return object == null ? undefined : object[key]; - }; - } - - /** - * A specialized version of `baseProperty` which supports deep paths. - * - * @private - * @param {Array|string} path The path of the property to get. - * @returns {Function} Returns the new function. - */ - function basePropertyDeep(path) { - return function(object) { - return baseGet(object, path); - }; - } - - /** - * The base implementation of `_.pullAllBy` without support for iteratee - * shorthands. - * - * @private - * @param {Array} array The array to modify. - * @param {Array} values The values to remove. - * @param {Function} [iteratee] The iteratee invoked per element. - * @param {Function} [comparator] The comparator invoked per element. - * @returns {Array} Returns `array`. - */ - function basePullAll(array, values, iteratee, comparator) { - var indexOf = comparator ? baseIndexOfWith : baseIndexOf, - index = -1, - length = values.length, - seen = array; - - if (iteratee) { - seen = arrayMap(array, baseUnary(iteratee)); - } - while (++index < length) { - var fromIndex = 0, - value = values[index], - computed = iteratee ? iteratee(value) : value; - - while ((fromIndex = indexOf(seen, computed, fromIndex, comparator)) > -1) { - if (seen !== array) { - splice.call(seen, fromIndex, 1); - } - splice.call(array, fromIndex, 1); - } - } - return array; - } - - /** - * The base implementation of `_.pullAt` without support for individual - * indexes or capturing the removed elements. - * - * @private - * @param {Array} array The array to modify. - * @param {number[]} indexes The indexes of elements to remove. - * @returns {Array} Returns `array`. - */ - function basePullAt(array, indexes) { - var length = array ? indexes.length : 0, - lastIndex = length - 1; - - while (length--) { - var index = indexes[length]; - if (lastIndex == length || index != previous) { - var previous = index; - if (isIndex(index)) { - splice.call(array, index, 1); - } - else if (!isKey(index, array)) { - var path = baseCastPath(index), - object = parent(array, path); - - if (object != null) { - delete object[last(path)]; - } - } - else { - delete array[index]; - } - } - } - return array; - } - - /** - * The base implementation of `_.random` without support for returning - * floating-point numbers. - * - * @private - * @param {number} lower The lower bound. - * @param {number} upper The upper bound. - * @returns {number} Returns the random number. - */ - function baseRandom(lower, upper) { - return lower + nativeFloor(nativeRandom() * (upper - lower + 1)); - } - - /** - * The base implementation of `_.range` and `_.rangeRight` which doesn't - * coerce arguments to numbers. - * - * @private - * @param {number} start The start of the range. - * @param {number} end The end of the range. - * @param {number} step The value to increment or decrement by. - * @param {boolean} [fromRight] Specify iterating from right to left. - * @returns {Array} Returns the new array of numbers. - */ - function baseRange(start, end, step, fromRight) { - var index = -1, - length = nativeMax(nativeCeil((end - start) / (step || 1)), 0), - result = Array(length); - - while (length--) { - result[fromRight ? length : ++index] = start; - start += step; - } - return result; - } - - /** - * The base implementation of `_.set`. - * - * @private - * @param {Object} object The object to query. - * @param {Array|string} path The path of the property to set. - * @param {*} value The value to set. - * @param {Function} [customizer] The function to customize path creation. - * @returns {Object} Returns `object`. - */ - function baseSet(object, path, value, customizer) { - path = isKey(path, object) ? [path + ''] : baseCastPath(path); - - var index = -1, - length = path.length, - lastIndex = length - 1, - nested = object; - - while (nested != null && ++index < length) { - var key = path[index]; - if (isObject(nested)) { - var newValue = value; - if (index != lastIndex) { - var objValue = nested[key]; - newValue = customizer ? customizer(objValue, key, nested) : undefined; - if (newValue === undefined) { - newValue = objValue == null - ? (isIndex(path[index + 1]) ? [] : {}) - : objValue; - } - } - assignValue(nested, key, newValue); - } - nested = nested[key]; - } - return object; - } - - /** - * The base implementation of `setData` without support for hot loop detection. - * - * @private - * @param {Function} func The function to associate metadata with. - * @param {*} data The metadata. - * @returns {Function} Returns `func`. - */ - var baseSetData = !metaMap ? identity : function(func, data) { - metaMap.set(func, data); - return func; - }; - - /** - * The base implementation of `_.slice` without an iteratee call guard. - * - * @private - * @param {Array} array The array to slice. - * @param {number} [start=0] The start position. - * @param {number} [end=array.length] The end position. - * @returns {Array} Returns the slice of `array`. - */ - function baseSlice(array, start, end) { - var index = -1, - length = array.length; - - if (start < 0) { - start = -start > length ? 0 : (length + start); - } - end = end > length ? length : end; - if (end < 0) { - end += length; - } - length = start > end ? 0 : ((end - start) >>> 0); - start >>>= 0; - - var result = Array(length); - while (++index < length) { - result[index] = array[index + start]; - } - return result; - } - - /** - * The base implementation of `_.some` without support for iteratee shorthands. - * - * @private - * @param {Array|Object} collection The collection to iterate over. - * @param {Function} predicate The function invoked per iteration. - * @returns {boolean} Returns `true` if any element passes the predicate check, else `false`. - */ - function baseSome(collection, predicate) { - var result; - - baseEach(collection, function(value, index, collection) { - result = predicate(value, index, collection); - return !result; - }); - return !!result; - } - - /** - * The base implementation of `_.sortedIndex` and `_.sortedLastIndex` which - * performs a binary search of `array` to determine the index at which `value` - * should be inserted into `array` in order to maintain its sort order. - * - * @private - * @param {Array} array The sorted array to inspect. - * @param {*} value The value to evaluate. - * @param {boolean} [retHighest] Specify returning the highest qualified index. - * @returns {number} Returns the index at which `value` should be inserted - * into `array`. - */ - function baseSortedIndex(array, value, retHighest) { - var low = 0, - high = array ? array.length : low; - - if (typeof value == 'number' && value === value && high <= HALF_MAX_ARRAY_LENGTH) { - while (low < high) { - var mid = (low + high) >>> 1, - computed = array[mid]; - - if ((retHighest ? (computed <= value) : (computed < value)) && computed !== null) { - low = mid + 1; - } else { - high = mid; - } - } - return high; - } - return baseSortedIndexBy(array, value, identity, retHighest); - } - - /** - * The base implementation of `_.sortedIndexBy` and `_.sortedLastIndexBy` - * which invokes `iteratee` for `value` and each element of `array` to compute - * their sort ranking. The iteratee is invoked with one argument; (value). - * - * @private - * @param {Array} array The sorted array to inspect. - * @param {*} value The value to evaluate. - * @param {Function} iteratee The iteratee invoked per element. - * @param {boolean} [retHighest] Specify returning the highest qualified index. - * @returns {number} Returns the index at which `value` should be inserted into `array`. - */ - function baseSortedIndexBy(array, value, iteratee, retHighest) { - value = iteratee(value); - - var low = 0, - high = array ? array.length : 0, - valIsNaN = value !== value, - valIsNull = value === null, - valIsUndef = value === undefined; - - while (low < high) { - var mid = nativeFloor((low + high) / 2), - computed = iteratee(array[mid]), - isDef = computed !== undefined, - isReflexive = computed === computed; - - if (valIsNaN) { - var setLow = isReflexive || retHighest; - } else if (valIsNull) { - setLow = isReflexive && isDef && (retHighest || computed != null); - } else if (valIsUndef) { - setLow = isReflexive && (retHighest || isDef); - } else if (computed == null) { - setLow = false; - } else { - setLow = retHighest ? (computed <= value) : (computed < value); - } - if (setLow) { - low = mid + 1; - } else { - high = mid; - } - } - return nativeMin(high, MAX_ARRAY_INDEX); - } - - /** - * The base implementation of `_.sortedUniq`. - * - * @private - * @param {Array} array The array to inspect. - * @returns {Array} Returns the new duplicate free array. - */ - function baseSortedUniq(array) { - return baseSortedUniqBy(array); - } - - /** - * The base implementation of `_.sortedUniqBy` without support for iteratee - * shorthands. - * - * @private - * @param {Array} array The array to inspect. - * @param {Function} [iteratee] The iteratee invoked per element. - * @returns {Array} Returns the new duplicate free array. - */ - function baseSortedUniqBy(array, iteratee) { - var index = 0, - length = array.length, - value = array[0], - computed = iteratee ? iteratee(value) : value, - seen = computed, - resIndex = 1, - result = [value]; - - while (++index < length) { - value = array[index], - computed = iteratee ? iteratee(value) : value; - - if (!eq(computed, seen)) { - seen = computed; - result[resIndex++] = value; - } - } - return result; - } - - /** - * The base implementation of `_.uniqBy` without support for iteratee shorthands. - * - * @private - * @param {Array} array The array to inspect. - * @param {Function} [iteratee] The iteratee invoked per element. - * @param {Function} [comparator] The comparator invoked per element. - * @returns {Array} Returns the new duplicate free array. - */ - function baseUniq(array, iteratee, comparator) { - var index = -1, - includes = arrayIncludes, - length = array.length, - isCommon = true, - result = [], - seen = result; - - if (comparator) { - isCommon = false; - includes = arrayIncludesWith; - } - else if (length >= LARGE_ARRAY_SIZE) { - var set = iteratee ? null : createSet(array); - if (set) { - return setToArray(set); - } - isCommon = false; - includes = cacheHas; - seen = new SetCache; - } - else { - seen = iteratee ? [] : result; - } - outer: - while (++index < length) { - var value = array[index], - computed = iteratee ? iteratee(value) : value; - - if (isCommon && computed === computed) { - var seenIndex = seen.length; - while (seenIndex--) { - if (seen[seenIndex] === computed) { - continue outer; - } - } - if (iteratee) { - seen.push(computed); - } - result.push(value); - } - else if (!includes(seen, computed, comparator)) { - if (seen !== result) { - seen.push(computed); - } - result.push(value); - } - } - return result; - } - - /** - * The base implementation of `_.unset`. - * - * @private - * @param {Object} object The object to modify. - * @param {Array|string} path The path of the property to unset. - * @returns {boolean} Returns `true` if the property is deleted, else `false`. - */ - function baseUnset(object, path) { - path = isKey(path, object) ? [path + ''] : baseCastPath(path); - object = parent(object, path); - var key = last(path); - return (object != null && has(object, key)) ? delete object[key] : true; - } - - /** - * The base implementation of `_.update`. - * - * @private - * @param {Object} object The object to query. - * @param {Array|string} path The path of the property to update. - * @param {Function} updater The function to produce the updated value. - * @param {Function} [customizer] The function to customize path creation. - * @returns {Object} Returns `object`. - */ - function baseUpdate(object, path, updater, customizer) { - return baseSet(object, path, updater(baseGet(object, path)), customizer); - } - - /** - * The base implementation of methods like `_.dropWhile` and `_.takeWhile` - * without support for iteratee shorthands. - * - * @private - * @param {Array} array The array to query. - * @param {Function} predicate The function invoked per iteration. - * @param {boolean} [isDrop] Specify dropping elements instead of taking them. - * @param {boolean} [fromRight] Specify iterating from right to left. - * @returns {Array} Returns the slice of `array`. - */ - function baseWhile(array, predicate, isDrop, fromRight) { - var length = array.length, - index = fromRight ? length : -1; - - while ((fromRight ? index-- : ++index < length) && - predicate(array[index], index, array)) {} - - return isDrop - ? baseSlice(array, (fromRight ? 0 : index), (fromRight ? index + 1 : length)) - : baseSlice(array, (fromRight ? index + 1 : 0), (fromRight ? length : index)); - } - - /** - * The base implementation of `wrapperValue` which returns the result of - * performing a sequence of actions on the unwrapped `value`, where each - * successive action is supplied the return value of the previous. - * - * @private - * @param {*} value The unwrapped value. - * @param {Array} actions Actions to perform to resolve the unwrapped value. - * @returns {*} Returns the resolved value. - */ - function baseWrapperValue(value, actions) { - var result = value; - if (result instanceof LazyWrapper) { - result = result.value(); - } - return arrayReduce(actions, function(result, action) { - return action.func.apply(action.thisArg, arrayPush([result], action.args)); - }, result); - } - - /** - * The base implementation of methods like `_.xor`, without support for - * iteratee shorthands, that accepts an array of arrays to inspect. - * - * @private - * @param {Array} arrays The arrays to inspect. - * @param {Function} [iteratee] The iteratee invoked per element. - * @param {Function} [comparator] The comparator invoked per element. - * @returns {Array} Returns the new array of values. - */ - function baseXor(arrays, iteratee, comparator) { - var index = -1, - length = arrays.length; - - while (++index < length) { - var result = result - ? arrayPush( - baseDifference(result, arrays[index], iteratee, comparator), - baseDifference(arrays[index], result, iteratee, comparator) - ) - : arrays[index]; - } - return (result && result.length) ? baseUniq(result, iteratee, comparator) : []; - } - - /** - * This base implementation of `_.zipObject` which assigns values using `assignFunc`. - * - * @private - * @param {Array} props The property names. - * @param {Array} values The property values. - * @param {Function} assignFunc The function to assign values. - * @returns {Object} Returns the new object. - */ - function baseZipObject(props, values, assignFunc) { - var index = -1, - length = props.length, - valsLength = values.length, - result = {}; - - while (++index < length) { - assignFunc(result, props[index], index < valsLength ? values[index] : undefined); - } - return result; - } - - /** - * Creates a clone of `buffer`. - * - * @private - * @param {Buffer} buffer The buffer to clone. - * @param {boolean} [isDeep] Specify a deep clone. - * @returns {Buffer} Returns the cloned buffer. - */ - function cloneBuffer(buffer, isDeep) { - if (isDeep) { - return buffer.slice(); - } - var result = new buffer.constructor(buffer.length); - buffer.copy(result); - return result; - } - - /** - * Creates a clone of `arrayBuffer`. - * - * @private - * @param {ArrayBuffer} arrayBuffer The array buffer to clone. - * @returns {ArrayBuffer} Returns the cloned array buffer. - */ - function cloneArrayBuffer(arrayBuffer) { - var result = new arrayBuffer.constructor(arrayBuffer.byteLength); - new Uint8Array(result).set(new Uint8Array(arrayBuffer)); - return result; - } - - /** - * Creates a clone of `map`. - * - * @private - * @param {Object} map The map to clone. - * @returns {Object} Returns the cloned map. - */ - function cloneMap(map) { - return arrayReduce(mapToArray(map), addMapEntry, new map.constructor); - } - - /** - * Creates a clone of `regexp`. - * - * @private - * @param {Object} regexp The regexp to clone. - * @returns {Object} Returns the cloned regexp. - */ - function cloneRegExp(regexp) { - var result = new regexp.constructor(regexp.source, reFlags.exec(regexp)); - result.lastIndex = regexp.lastIndex; - return result; - } - - /** - * Creates a clone of `set`. - * - * @private - * @param {Object} set The set to clone. - * @returns {Object} Returns the cloned set. - */ - function cloneSet(set) { - return arrayReduce(setToArray(set), addSetEntry, new set.constructor); - } - - /** - * Creates a clone of the `symbol` object. - * - * @private - * @param {Object} symbol The symbol object to clone. - * @returns {Object} Returns the cloned symbol object. - */ - function cloneSymbol(symbol) { - return symbolValueOf ? Object(symbolValueOf.call(symbol)) : {}; - } - - /** - * Creates a clone of `typedArray`. - * - * @private - * @param {Object} typedArray The typed array to clone. - * @param {boolean} [isDeep] Specify a deep clone. - * @returns {Object} Returns the cloned typed array. - */ - function cloneTypedArray(typedArray, isDeep) { - var buffer = isDeep ? cloneArrayBuffer(typedArray.buffer) : typedArray.buffer; - return new typedArray.constructor(buffer, typedArray.byteOffset, typedArray.length); - } - - /** - * Creates an array that is the composition of partially applied arguments, - * placeholders, and provided arguments into a single array of arguments. - * - * @private - * @param {Array|Object} args The provided arguments. - * @param {Array} partials The arguments to prepend to those provided. - * @param {Array} holders The `partials` placeholder indexes. - * @params {boolean} [isCurried] Specify composing for a curried function. - * @returns {Array} Returns the new array of composed arguments. - */ - function composeArgs(args, partials, holders, isCurried) { - var argsIndex = -1, - argsLength = args.length, - holdersLength = holders.length, - leftIndex = -1, - leftLength = partials.length, - rangeLength = nativeMax(argsLength - holdersLength, 0), - result = Array(leftLength + rangeLength), - isUncurried = !isCurried; - - while (++leftIndex < leftLength) { - result[leftIndex] = partials[leftIndex]; - } - while (++argsIndex < holdersLength) { - if (isUncurried || argsIndex < argsLength) { - result[holders[argsIndex]] = args[argsIndex]; - } - } - while (rangeLength--) { - result[leftIndex++] = args[argsIndex++]; - } - return result; - } - - /** - * This function is like `composeArgs` except that the arguments composition - * is tailored for `_.partialRight`. - * - * @private - * @param {Array|Object} args The provided arguments. - * @param {Array} partials The arguments to append to those provided. - * @param {Array} holders The `partials` placeholder indexes. - * @params {boolean} [isCurried] Specify composing for a curried function. - * @returns {Array} Returns the new array of composed arguments. - */ - function composeArgsRight(args, partials, holders, isCurried) { - var argsIndex = -1, - argsLength = args.length, - holdersIndex = -1, - holdersLength = holders.length, - rightIndex = -1, - rightLength = partials.length, - rangeLength = nativeMax(argsLength - holdersLength, 0), - result = Array(rangeLength + rightLength), - isUncurried = !isCurried; - - while (++argsIndex < rangeLength) { - result[argsIndex] = args[argsIndex]; - } - var offset = argsIndex; - while (++rightIndex < rightLength) { - result[offset + rightIndex] = partials[rightIndex]; - } - while (++holdersIndex < holdersLength) { - if (isUncurried || argsIndex < argsLength) { - result[offset + holders[holdersIndex]] = args[argsIndex++]; - } - } - return result; - } - - /** - * Copies the values of `source` to `array`. - * - * @private - * @param {Array} source The array to copy values from. - * @param {Array} [array=[]] The array to copy values to. - * @returns {Array} Returns `array`. - */ - function copyArray(source, array) { - var index = -1, - length = source.length; - - array || (array = Array(length)); - while (++index < length) { - array[index] = source[index]; - } - return array; - } - - /** - * Copies properties of `source` to `object`. - * - * @private - * @param {Object} source The object to copy properties from. - * @param {Array} props The property names to copy. - * @param {Object} [object={}] The object to copy properties to. - * @returns {Object} Returns `object`. - */ - function copyObject(source, props, object) { - return copyObjectWith(source, props, object); - } - - /** - * This function is like `copyObject` except that it accepts a function to - * customize copied values. - * - * @private - * @param {Object} source The object to copy properties from. - * @param {Array} props The property names to copy. - * @param {Object} [object={}] The object to copy properties to. - * @param {Function} [customizer] The function to customize copied values. - * @returns {Object} Returns `object`. - */ - function copyObjectWith(source, props, object, customizer) { - object || (object = {}); - - var index = -1, - length = props.length; - - while (++index < length) { - var key = props[index]; - - var newValue = customizer - ? customizer(object[key], source[key], key, object, source) - : source[key]; - - assignValue(object, key, newValue); - } - return object; - } - - /** - * Copies own symbol properties of `source` to `object`. - * - * @private - * @param {Object} source The object to copy symbols from. - * @param {Object} [object={}] The object to copy symbols to. - * @returns {Object} Returns `object`. - */ - function copySymbols(source, object) { - return copyObject(source, getSymbols(source), object); - } - - /** - * Creates a function like `_.groupBy`. - * - * @private - * @param {Function} setter The function to set accumulator values. - * @param {Function} [initializer] The accumulator object initializer. - * @returns {Function} Returns the new aggregator function. - */ - function createAggregator(setter, initializer) { - return function(collection, iteratee) { - var func = isArray(collection) ? arrayAggregator : baseAggregator, - accumulator = initializer ? initializer() : {}; - - return func(collection, setter, getIteratee(iteratee), accumulator); - }; - } - - /** - * Creates a function like `_.assign`. - * - * @private - * @param {Function} assigner The function to assign values. - * @returns {Function} Returns the new assigner function. - */ - function createAssigner(assigner) { - return rest(function(object, sources) { - var index = -1, - length = sources.length, - customizer = length > 1 ? sources[length - 1] : undefined, - guard = length > 2 ? sources[2] : undefined; - - customizer = typeof customizer == 'function' - ? (length--, customizer) - : undefined; - - if (guard && isIterateeCall(sources[0], sources[1], guard)) { - customizer = length < 3 ? undefined : customizer; - length = 1; - } - object = Object(object); - while (++index < length) { - var source = sources[index]; - if (source) { - assigner(object, source, index, customizer); - } - } - return object; - }); - } - - /** - * Creates a `baseEach` or `baseEachRight` function. - * - * @private - * @param {Function} eachFunc The function to iterate over a collection. - * @param {boolean} [fromRight] Specify iterating from right to left. - * @returns {Function} Returns the new base function. - */ - function createBaseEach(eachFunc, fromRight) { - return function(collection, iteratee) { - if (collection == null) { - return collection; - } - if (!isArrayLike(collection)) { - return eachFunc(collection, iteratee); - } - var length = collection.length, - index = fromRight ? length : -1, - iterable = Object(collection); - - while ((fromRight ? index-- : ++index < length)) { - if (iteratee(iterable[index], index, iterable) === false) { - break; - } - } - return collection; - }; - } - - /** - * Creates a base function for methods like `_.forIn`. - * - * @private - * @param {boolean} [fromRight] Specify iterating from right to left. - * @returns {Function} Returns the new base function. - */ - function createBaseFor(fromRight) { - return function(object, iteratee, keysFunc) { - var index = -1, - iterable = Object(object), - props = keysFunc(object), - length = props.length; - - while (length--) { - var key = props[fromRight ? length : ++index]; - if (iteratee(iterable[key], key, iterable) === false) { - break; - } - } - return object; - }; - } - - /** - * Creates a function that wraps `func` to invoke it with the optional `this` - * binding of `thisArg`. - * - * @private - * @param {Function} func The function to wrap. - * @param {number} bitmask The bitmask of wrapper flags. See `createWrapper` for more details. - * @param {*} [thisArg] The `this` binding of `func`. - * @returns {Function} Returns the new wrapped function. - */ - function createBaseWrapper(func, bitmask, thisArg) { - var isBind = bitmask & BIND_FLAG, - Ctor = createCtorWrapper(func); - - function wrapper() { - var fn = (this && this !== root && this instanceof wrapper) ? Ctor : func; - return fn.apply(isBind ? thisArg : this, arguments); - } - return wrapper; - } - - /** - * Creates a function like `_.lowerFirst`. - * - * @private - * @param {string} methodName The name of the `String` case method to use. - * @returns {Function} Returns the new function. - */ - function createCaseFirst(methodName) { - return function(string) { - string = toString(string); - - var strSymbols = reHasComplexSymbol.test(string) - ? stringToArray(string) - : undefined; - - var chr = strSymbols ? strSymbols[0] : string.charAt(0), - trailing = strSymbols ? strSymbols.slice(1).join('') : string.slice(1); - - return chr[methodName]() + trailing; - }; - } - - /** - * Creates a function like `_.camelCase`. - * - * @private - * @param {Function} callback The function to combine each word. - * @returns {Function} Returns the new compounder function. - */ - function createCompounder(callback) { - return function(string) { - return arrayReduce(words(deburr(string)), callback, ''); - }; - } - - /** - * Creates a function that produces an instance of `Ctor` regardless of - * whether it was invoked as part of a `new` expression or by `call` or `apply`. - * - * @private - * @param {Function} Ctor The constructor to wrap. - * @returns {Function} Returns the new wrapped function. - */ - function createCtorWrapper(Ctor) { - return function() { - // Use a `switch` statement to work with class constructors. - // See http://ecma-international.org/ecma-262/6.0/#sec-ecmascript-function-objects-call-thisargument-argumentslist - // for more details. - var args = arguments; - switch (args.length) { - case 0: return new Ctor; - case 1: return new Ctor(args[0]); - case 2: return new Ctor(args[0], args[1]); - case 3: return new Ctor(args[0], args[1], args[2]); - case 4: return new Ctor(args[0], args[1], args[2], args[3]); - case 5: return new Ctor(args[0], args[1], args[2], args[3], args[4]); - case 6: return new Ctor(args[0], args[1], args[2], args[3], args[4], args[5]); - case 7: return new Ctor(args[0], args[1], args[2], args[3], args[4], args[5], args[6]); - } - var thisBinding = baseCreate(Ctor.prototype), - result = Ctor.apply(thisBinding, args); - - // Mimic the constructor's `return` behavior. - // See https://es5.github.io/#x13.2.2 for more details. - return isObject(result) ? result : thisBinding; - }; - } - - /** - * Creates a function that wraps `func` to enable currying. - * - * @private - * @param {Function} func The function to wrap. - * @param {number} bitmask The bitmask of wrapper flags. See `createWrapper` for more details. - * @param {number} arity The arity of `func`. - * @returns {Function} Returns the new wrapped function. - */ - function createCurryWrapper(func, bitmask, arity) { - var Ctor = createCtorWrapper(func); - - function wrapper() { - var length = arguments.length, - args = Array(length), - index = length, - placeholder = getPlaceholder(wrapper); - - while (index--) { - args[index] = arguments[index]; - } - var holders = (length < 3 && args[0] !== placeholder && args[length - 1] !== placeholder) - ? [] - : replaceHolders(args, placeholder); - - length -= holders.length; - if (length < arity) { - return createRecurryWrapper( - func, bitmask, createHybridWrapper, wrapper.placeholder, undefined, - args, holders, undefined, undefined, arity - length); - } - var fn = (this && this !== root && this instanceof wrapper) ? Ctor : func; - return apply(fn, this, args); - } - return wrapper; - } - - /** - * Creates a `_.flow` or `_.flowRight` function. - * - * @private - * @param {boolean} [fromRight] Specify iterating from right to left. - * @returns {Function} Returns the new flow function. - */ - function createFlow(fromRight) { - return rest(function(funcs) { - funcs = baseFlatten(funcs, 1); - - var length = funcs.length, - index = length, - prereq = LodashWrapper.prototype.thru; - - if (fromRight) { - funcs.reverse(); - } - while (index--) { - var func = funcs[index]; - if (typeof func != 'function') { - throw new TypeError(FUNC_ERROR_TEXT); - } - if (prereq && !wrapper && getFuncName(func) == 'wrapper') { - var wrapper = new LodashWrapper([], true); - } - } - index = wrapper ? index : length; - while (++index < length) { - func = funcs[index]; - - var funcName = getFuncName(func), - data = funcName == 'wrapper' ? getData(func) : undefined; - - if (data && isLaziable(data[0]) && - data[1] == (ARY_FLAG | CURRY_FLAG | PARTIAL_FLAG | REARG_FLAG) && - !data[4].length && data[9] == 1 - ) { - wrapper = wrapper[getFuncName(data[0])].apply(wrapper, data[3]); - } else { - wrapper = (func.length == 1 && isLaziable(func)) ? wrapper[funcName]() : wrapper.thru(func); - } - } - return function() { - var args = arguments, - value = args[0]; - - if (wrapper && args.length == 1 && - isArray(value) && value.length >= LARGE_ARRAY_SIZE) { - return wrapper.plant(value).value(); - } - var index = 0, - result = length ? funcs[index].apply(this, args) : value; - - while (++index < length) { - result = funcs[index].call(this, result); - } - return result; - }; - }); - } - - /** - * Creates a function that wraps `func` to invoke it with optional `this` - * binding of `thisArg`, partial application, and currying. - * - * @private - * @param {Function|string} func The function or method name to wrap. - * @param {number} bitmask The bitmask of wrapper flags. See `createWrapper` for more details. - * @param {*} [thisArg] The `this` binding of `func`. - * @param {Array} [partials] The arguments to prepend to those provided to the new function. - * @param {Array} [holders] The `partials` placeholder indexes. - * @param {Array} [partialsRight] The arguments to append to those provided to the new function. - * @param {Array} [holdersRight] The `partialsRight` placeholder indexes. - * @param {Array} [argPos] The argument positions of the new function. - * @param {number} [ary] The arity cap of `func`. - * @param {number} [arity] The arity of `func`. - * @returns {Function} Returns the new wrapped function. - */ - function createHybridWrapper(func, bitmask, thisArg, partials, holders, partialsRight, holdersRight, argPos, ary, arity) { - var isAry = bitmask & ARY_FLAG, - isBind = bitmask & BIND_FLAG, - isBindKey = bitmask & BIND_KEY_FLAG, - isCurried = bitmask & (CURRY_FLAG | CURRY_RIGHT_FLAG), - isFlip = bitmask & FLIP_FLAG, - Ctor = isBindKey ? undefined : createCtorWrapper(func); - - function wrapper() { - var length = arguments.length, - index = length, - args = Array(length); - - while (index--) { - args[index] = arguments[index]; - } - if (isCurried) { - var placeholder = getPlaceholder(wrapper), - holdersCount = countHolders(args, placeholder); - } - if (partials) { - args = composeArgs(args, partials, holders, isCurried); - } - if (partialsRight) { - args = composeArgsRight(args, partialsRight, holdersRight, isCurried); - } - length -= holdersCount; - if (isCurried && length < arity) { - var newHolders = replaceHolders(args, placeholder); - return createRecurryWrapper( - func, bitmask, createHybridWrapper, wrapper.placeholder, thisArg, - args, newHolders, argPos, ary, arity - length - ); - } - var thisBinding = isBind ? thisArg : this, - fn = isBindKey ? thisBinding[func] : func; - - length = args.length; - if (argPos) { - args = reorder(args, argPos); - } else if (isFlip && length > 1) { - args.reverse(); - } - if (isAry && ary < length) { - args.length = ary; - } - if (this && this !== root && this instanceof wrapper) { - fn = Ctor || createCtorWrapper(fn); - } - return fn.apply(thisBinding, args); - } - return wrapper; - } - - /** - * Creates a function like `_.invertBy`. - * - * @private - * @param {Function} setter The function to set accumulator values. - * @param {Function} toIteratee The function to resolve iteratees. - * @returns {Function} Returns the new inverter function. - */ - function createInverter(setter, toIteratee) { - return function(object, iteratee) { - return baseInverter(object, setter, toIteratee(iteratee), {}); - }; - } - - /** - * Creates a function like `_.over`. - * - * @private - * @param {Function} arrayFunc The function to iterate over iteratees. - * @returns {Function} Returns the new invoker function. - */ - function createOver(arrayFunc) { - return rest(function(iteratees) { - iteratees = arrayMap(baseFlatten(iteratees, 1), getIteratee()); - return rest(function(args) { - var thisArg = this; - return arrayFunc(iteratees, function(iteratee) { - return apply(iteratee, thisArg, args); - }); - }); - }); - } - - /** - * Creates the padding for `string` based on `length`. The `chars` string - * is truncated if the number of characters exceeds `length`. - * - * @private - * @param {string} string The string to create padding for. - * @param {number} [length=0] The padding length. - * @param {string} [chars=' '] The string used as padding. - * @returns {string} Returns the padding for `string`. - */ - function createPadding(string, length, chars) { - length = toInteger(length); - - var strLength = stringSize(string); - if (!length || strLength >= length) { - return ''; - } - var padLength = length - strLength; - chars = chars === undefined ? ' ' : (chars + ''); - - var result = repeat(chars, nativeCeil(padLength / stringSize(chars))); - return reHasComplexSymbol.test(chars) - ? stringToArray(result).slice(0, padLength).join('') - : result.slice(0, padLength); - } - - /** - * Creates a function that wraps `func` to invoke it with the optional `this` - * binding of `thisArg` and the `partials` prepended to those provided to - * the wrapper. - * - * @private - * @param {Function} func The function to wrap. - * @param {number} bitmask The bitmask of wrapper flags. See `createWrapper` for more details. - * @param {*} thisArg The `this` binding of `func`. - * @param {Array} partials The arguments to prepend to those provided to the new function. - * @returns {Function} Returns the new wrapped function. - */ - function createPartialWrapper(func, bitmask, thisArg, partials) { - var isBind = bitmask & BIND_FLAG, - Ctor = createCtorWrapper(func); - - function wrapper() { - var argsIndex = -1, - argsLength = arguments.length, - leftIndex = -1, - leftLength = partials.length, - args = Array(leftLength + argsLength), - fn = (this && this !== root && this instanceof wrapper) ? Ctor : func; - - while (++leftIndex < leftLength) { - args[leftIndex] = partials[leftIndex]; - } - while (argsLength--) { - args[leftIndex++] = arguments[++argsIndex]; - } - return apply(fn, isBind ? thisArg : this, args); - } - return wrapper; - } - - /** - * Creates a `_.range` or `_.rangeRight` function. - * - * @private - * @param {boolean} [fromRight] Specify iterating from right to left. - * @returns {Function} Returns the new range function. - */ - function createRange(fromRight) { - return function(start, end, step) { - if (step && typeof step != 'number' && isIterateeCall(start, end, step)) { - end = step = undefined; - } - // Ensure the sign of `-0` is preserved. - start = toNumber(start); - start = start === start ? start : 0; - if (end === undefined) { - end = start; - start = 0; - } else { - end = toNumber(end) || 0; - } - step = step === undefined ? (start < end ? 1 : -1) : (toNumber(step) || 0); - return baseRange(start, end, step, fromRight); - }; - } - - /** - * Creates a function that wraps `func` to continue currying. - * - * @private - * @param {Function} func The function to wrap. - * @param {number} bitmask The bitmask of wrapper flags. See `createWrapper` for more details. - * @param {Function} wrapFunc The function to create the `func` wrapper. - * @param {*} placeholder The placeholder value. - * @param {*} [thisArg] The `this` binding of `func`. - * @param {Array} [partials] The arguments to prepend to those provided to the new function. - * @param {Array} [holders] The `partials` placeholder indexes. - * @param {Array} [argPos] The argument positions of the new function. - * @param {number} [ary] The arity cap of `func`. - * @param {number} [arity] The arity of `func`. - * @returns {Function} Returns the new wrapped function. - */ - function createRecurryWrapper(func, bitmask, wrapFunc, placeholder, thisArg, partials, holders, argPos, ary, arity) { - var isCurry = bitmask & CURRY_FLAG, - newArgPos = argPos ? copyArray(argPos) : undefined, - newHolders = isCurry ? holders : undefined, - newHoldersRight = isCurry ? undefined : holders, - newPartials = isCurry ? partials : undefined, - newPartialsRight = isCurry ? undefined : partials; - - bitmask |= (isCurry ? PARTIAL_FLAG : PARTIAL_RIGHT_FLAG); - bitmask &= ~(isCurry ? PARTIAL_RIGHT_FLAG : PARTIAL_FLAG); - - if (!(bitmask & CURRY_BOUND_FLAG)) { - bitmask &= ~(BIND_FLAG | BIND_KEY_FLAG); - } - var newData = [ - func, bitmask, thisArg, newPartials, newHolders, newPartialsRight, - newHoldersRight, newArgPos, ary, arity - ]; - - var result = wrapFunc.apply(undefined, newData); - if (isLaziable(func)) { - setData(result, newData); - } - result.placeholder = placeholder; - return result; - } - - /** - * Creates a function like `_.round`. - * - * @private - * @param {string} methodName The name of the `Math` method to use when rounding. - * @returns {Function} Returns the new round function. - */ - function createRound(methodName) { - var func = Math[methodName]; - return function(number, precision) { - number = toNumber(number); - precision = toInteger(precision); - if (precision) { - // Shift with exponential notation to avoid floating-point issues. - // See [MDN](https://mdn.io/round#Examples) for more details. - var pair = (toString(number) + 'e').split('e'), - value = func(pair[0] + 'e' + (+pair[1] + precision)); - - pair = (toString(value) + 'e').split('e'); - return +(pair[0] + 'e' + (+pair[1] - precision)); - } - return func(number); - }; - } - - /** - * Creates a set of `values`. - * - * @private - * @param {Array} values The values to add to the set. - * @returns {Object} Returns the new set. - */ - var createSet = !(Set && new Set([1, 2]).size === 2) ? noop : function(values) { - return new Set(values); - }; - - /** - * Creates a function that either curries or invokes `func` with optional - * `this` binding and partially applied arguments. - * - * @private - * @param {Function|string} func The function or method name to wrap. - * @param {number} bitmask The bitmask of wrapper flags. - * The bitmask may be composed of the following flags: - * 1 - `_.bind` - * 2 - `_.bindKey` - * 4 - `_.curry` or `_.curryRight` of a bound function - * 8 - `_.curry` - * 16 - `_.curryRight` - * 32 - `_.partial` - * 64 - `_.partialRight` - * 128 - `_.rearg` - * 256 - `_.ary` - * @param {*} [thisArg] The `this` binding of `func`. - * @param {Array} [partials] The arguments to be partially applied. - * @param {Array} [holders] The `partials` placeholder indexes. - * @param {Array} [argPos] The argument positions of the new function. - * @param {number} [ary] The arity cap of `func`. - * @param {number} [arity] The arity of `func`. - * @returns {Function} Returns the new wrapped function. - */ - function createWrapper(func, bitmask, thisArg, partials, holders, argPos, ary, arity) { - var isBindKey = bitmask & BIND_KEY_FLAG; - if (!isBindKey && typeof func != 'function') { - throw new TypeError(FUNC_ERROR_TEXT); - } - var length = partials ? partials.length : 0; - if (!length) { - bitmask &= ~(PARTIAL_FLAG | PARTIAL_RIGHT_FLAG); - partials = holders = undefined; - } - ary = ary === undefined ? ary : nativeMax(toInteger(ary), 0); - arity = arity === undefined ? arity : toInteger(arity); - length -= holders ? holders.length : 0; - - if (bitmask & PARTIAL_RIGHT_FLAG) { - var partialsRight = partials, - holdersRight = holders; - - partials = holders = undefined; - } - var data = isBindKey ? undefined : getData(func); - - var newData = [ - func, bitmask, thisArg, partials, holders, partialsRight, holdersRight, - argPos, ary, arity - ]; - - if (data) { - mergeData(newData, data); - } - func = newData[0]; - bitmask = newData[1]; - thisArg = newData[2]; - partials = newData[3]; - holders = newData[4]; - arity = newData[9] = newData[9] == null - ? (isBindKey ? 0 : func.length) - : nativeMax(newData[9] - length, 0); - - if (!arity && bitmask & (CURRY_FLAG | CURRY_RIGHT_FLAG)) { - bitmask &= ~(CURRY_FLAG | CURRY_RIGHT_FLAG); - } - if (!bitmask || bitmask == BIND_FLAG) { - var result = createBaseWrapper(func, bitmask, thisArg); - } else if (bitmask == CURRY_FLAG || bitmask == CURRY_RIGHT_FLAG) { - result = createCurryWrapper(func, bitmask, arity); - } else if ((bitmask == PARTIAL_FLAG || bitmask == (BIND_FLAG | PARTIAL_FLAG)) && !holders.length) { - result = createPartialWrapper(func, bitmask, thisArg, partials); - } else { - result = createHybridWrapper.apply(undefined, newData); - } - var setter = data ? baseSetData : setData; - return setter(result, newData); - } - - /** - * A specialized version of `baseIsEqualDeep` for arrays with support for - * partial deep comparisons. - * - * @private - * @param {Array} array The array to compare. - * @param {Array} other The other array to compare. - * @param {Function} equalFunc The function to determine equivalents of values. - * @param {Function} customizer The function to customize comparisons. - * @param {number} bitmask The bitmask of comparison flags. See `baseIsEqual` for more details. - * @param {Object} stack Tracks traversed `array` and `other` objects. - * @returns {boolean} Returns `true` if the arrays are equivalent, else `false`. - */ - function equalArrays(array, other, equalFunc, customizer, bitmask, stack) { - var index = -1, - isPartial = bitmask & PARTIAL_COMPARE_FLAG, - isUnordered = bitmask & UNORDERED_COMPARE_FLAG, - arrLength = array.length, - othLength = other.length; - - if (arrLength != othLength && !(isPartial && othLength > arrLength)) { - return false; - } - // Assume cyclic values are equal. - var stacked = stack.get(array); - if (stacked) { - return stacked == other; - } - var result = true; - stack.set(array, other); - - // Ignore non-index properties. - while (++index < arrLength) { - var arrValue = array[index], - othValue = other[index]; - - if (customizer) { - var compared = isPartial - ? customizer(othValue, arrValue, index, other, array, stack) - : customizer(arrValue, othValue, index, array, other, stack); - } - if (compared !== undefined) { - if (compared) { - continue; - } - result = false; - break; - } - // Recursively compare arrays (susceptible to call stack limits). - if (isUnordered) { - if (!arraySome(other, function(othValue) { - return arrValue === othValue || equalFunc(arrValue, othValue, customizer, bitmask, stack); - })) { - result = false; - break; - } - } else if (!(arrValue === othValue || equalFunc(arrValue, othValue, customizer, bitmask, stack))) { - result = false; - break; - } - } - stack['delete'](array); - return result; - } - - /** - * A specialized version of `baseIsEqualDeep` for comparing objects of - * the same `toStringTag`. - * - * **Note:** This function only supports comparing values with tags of - * `Boolean`, `Date`, `Error`, `Number`, `RegExp`, or `String`. - * - * @private - * @param {Object} object The object to compare. - * @param {Object} other The other object to compare. - * @param {string} tag The `toStringTag` of the objects to compare. - * @param {Function} equalFunc The function to determine equivalents of values. - * @param {Function} customizer The function to customize comparisons. - * @param {number} bitmask The bitmask of comparison flags. See `baseIsEqual` for more details. - * @param {Object} stack Tracks traversed `object` and `other` objects. - * @returns {boolean} Returns `true` if the objects are equivalent, else `false`. - */ - function equalByTag(object, other, tag, equalFunc, customizer, bitmask, stack) { - switch (tag) { - case arrayBufferTag: - if ((object.byteLength != other.byteLength) || - !equalFunc(new Uint8Array(object), new Uint8Array(other))) { - return false; - } - return true; - - case boolTag: - case dateTag: - // Coerce dates and booleans to numbers, dates to milliseconds and booleans - // to `1` or `0` treating invalid dates coerced to `NaN` as not equal. - return +object == +other; - - case errorTag: - return object.name == other.name && object.message == other.message; - - case numberTag: - // Treat `NaN` vs. `NaN` as equal. - return (object != +object) ? other != +other : object == +other; - - case regexpTag: - case stringTag: - // Coerce regexes to strings and treat strings primitives and string - // objects as equal. See https://es5.github.io/#x15.10.6.4 for more details. - return object == (other + ''); - - case mapTag: - var convert = mapToArray; - - case setTag: - var isPartial = bitmask & PARTIAL_COMPARE_FLAG; - convert || (convert = setToArray); - - if (object.size != other.size && !isPartial) { - return false; - } - // Assume cyclic values are equal. - var stacked = stack.get(object); - if (stacked) { - return stacked == other; - } - // Recursively compare objects (susceptible to call stack limits). - return equalArrays(convert(object), convert(other), equalFunc, customizer, bitmask | UNORDERED_COMPARE_FLAG, stack.set(object, other)); - - case symbolTag: - if (symbolValueOf) { - return symbolValueOf.call(object) == symbolValueOf.call(other); - } - } - return false; - } - - /** - * A specialized version of `baseIsEqualDeep` for objects with support for - * partial deep comparisons. - * - * @private - * @param {Object} object The object to compare. - * @param {Object} other The other object to compare. - * @param {Function} equalFunc The function to determine equivalents of values. - * @param {Function} customizer The function to customize comparisons. - * @param {number} bitmask The bitmask of comparison flags. See `baseIsEqual` for more details. - * @param {Object} stack Tracks traversed `object` and `other` objects. - * @returns {boolean} Returns `true` if the objects are equivalent, else `false`. - */ - function equalObjects(object, other, equalFunc, customizer, bitmask, stack) { - var isPartial = bitmask & PARTIAL_COMPARE_FLAG, - objProps = keys(object), - objLength = objProps.length, - othProps = keys(other), - othLength = othProps.length; - - if (objLength != othLength && !isPartial) { - return false; - } - var index = objLength; - while (index--) { - var key = objProps[index]; - if (!(isPartial ? key in other : baseHas(other, key))) { - return false; - } - } - // Assume cyclic values are equal. - var stacked = stack.get(object); - if (stacked) { - return stacked == other; - } - var result = true; - stack.set(object, other); - - var skipCtor = isPartial; - while (++index < objLength) { - key = objProps[index]; - var objValue = object[key], - othValue = other[key]; - - if (customizer) { - var compared = isPartial - ? customizer(othValue, objValue, key, other, object, stack) - : customizer(objValue, othValue, key, object, other, stack); - } - // Recursively compare objects (susceptible to call stack limits). - if (!(compared === undefined - ? (objValue === othValue || equalFunc(objValue, othValue, customizer, bitmask, stack)) - : compared - )) { - result = false; - break; - } - skipCtor || (skipCtor = key == 'constructor'); - } - if (result && !skipCtor) { - var objCtor = object.constructor, - othCtor = other.constructor; - - // Non `Object` object instances with different constructors are not equal. - if (objCtor != othCtor && - ('constructor' in object && 'constructor' in other) && - !(typeof objCtor == 'function' && objCtor instanceof objCtor && - typeof othCtor == 'function' && othCtor instanceof othCtor)) { - result = false; - } - } - stack['delete'](object); - return result; - } - - /** - * Gets metadata for `func`. - * - * @private - * @param {Function} func The function to query. - * @returns {*} Returns the metadata for `func`. - */ - var getData = !metaMap ? noop : function(func) { - return metaMap.get(func); - }; - - /** - * Gets the name of `func`. - * - * @private - * @param {Function} func The function to query. - * @returns {string} Returns the function name. - */ - function getFuncName(func) { - var result = (func.name + ''), - array = realNames[result], - length = hasOwnProperty.call(realNames, result) ? array.length : 0; - - while (length--) { - var data = array[length], - otherFunc = data.func; - if (otherFunc == null || otherFunc == func) { - return data.name; - } - } - return result; - } - - /** - * Gets the appropriate "iteratee" function. If the `_.iteratee` method is - * customized this function returns the custom method, otherwise it returns - * `baseIteratee`. If arguments are provided the chosen function is invoked - * with them and its result is returned. - * - * @private - * @param {*} [value] The value to convert to an iteratee. - * @param {number} [arity] The arity of the created iteratee. - * @returns {Function} Returns the chosen function or its result. - */ - function getIteratee() { - var result = lodash.iteratee || iteratee; - result = result === iteratee ? baseIteratee : result; - return arguments.length ? result(arguments[0], arguments[1]) : result; - } - - /** - * Gets the "length" property value of `object`. - * - * **Note:** This function is used to avoid a [JIT bug](https://bugs.webkit.org/show_bug.cgi?id=142792) - * that affects Safari on at least iOS 8.1-8.3 ARM64. - * - * @private - * @param {Object} object The object to query. - * @returns {*} Returns the "length" value. - */ - var getLength = baseProperty('length'); - - /** - * Gets the property names, values, and compare flags of `object`. - * - * @private - * @param {Object} object The object to query. - * @returns {Array} Returns the match data of `object`. - */ - function getMatchData(object) { - var result = toPairs(object), - length = result.length; - - while (length--) { - result[length][2] = isStrictComparable(result[length][1]); - } - return result; - } - - /** - * Gets the native function at `key` of `object`. - * - * @private - * @param {Object} object The object to query. - * @param {string} key The key of the method to get. - * @returns {*} Returns the function if it's native, else `undefined`. - */ - function getNative(object, key) { - var value = object[key]; - return isNative(value) ? value : undefined; - } - - /** - * Gets the argument placeholder value for `func`. - * - * @private - * @param {Function} func The function to inspect. - * @returns {*} Returns the placeholder value. - */ - function getPlaceholder(func) { - var object = hasOwnProperty.call(lodash, 'placeholder') ? lodash : func; - return object.placeholder; - } - - /** - * Creates an array of the own symbol properties of `object`. - * - * @private - * @param {Object} object The object to query. - * @returns {Array} Returns the array of symbols. - */ - var getSymbols = getOwnPropertySymbols || function() { - return []; - }; - - /** - * Gets the `toStringTag` of `value`. - * - * @private - * @param {*} value The value to query. - * @returns {string} Returns the `toStringTag`. - */ - function getTag(value) { - return objectToString.call(value); - } - - // Fallback for IE 11 providing `toStringTag` values for maps, sets, and weakmaps. - if ((Map && getTag(new Map) != mapTag) || - (Set && getTag(new Set) != setTag) || - (WeakMap && getTag(new WeakMap) != weakMapTag)) { - getTag = function(value) { - var result = objectToString.call(value), - Ctor = result == objectTag ? value.constructor : null, - ctorString = typeof Ctor == 'function' ? funcToString.call(Ctor) : ''; - - if (ctorString) { - switch (ctorString) { - case mapCtorString: return mapTag; - case setCtorString: return setTag; - case weakMapCtorString: return weakMapTag; - } - } - return result; - }; - } - - /** - * Gets the view, applying any `transforms` to the `start` and `end` positions. - * - * @private - * @param {number} start The start of the view. - * @param {number} end The end of the view. - * @param {Array} transforms The transformations to apply to the view. - * @returns {Object} Returns an object containing the `start` and `end` - * positions of the view. - */ - function getView(start, end, transforms) { - var index = -1, - length = transforms.length; - - while (++index < length) { - var data = transforms[index], - size = data.size; - - switch (data.type) { - case 'drop': start += size; break; - case 'dropRight': end -= size; break; - case 'take': end = nativeMin(end, start + size); break; - case 'takeRight': start = nativeMax(start, end - size); break; - } - } - return { 'start': start, 'end': end }; - } - - /** - * Checks if `path` exists on `object`. - * - * @private - * @param {Object} object The object to query. - * @param {Array|string} path The path to check. - * @param {Function} hasFunc The function to check properties. - * @returns {boolean} Returns `true` if `path` exists, else `false`. - */ - function hasPath(object, path, hasFunc) { - if (object == null) { - return false; - } - var result = hasFunc(object, path); - if (!result && !isKey(path)) { - path = baseCastPath(path); - object = parent(object, path); - if (object != null) { - path = last(path); - result = hasFunc(object, path); - } - } - var length = object ? object.length : undefined; - return result || ( - !!length && isLength(length) && isIndex(path, length) && - (isArray(object) || isString(object) || isArguments(object)) - ); - } - - /** - * Initializes an array clone. - * - * @private - * @param {Array} array The array to clone. - * @returns {Array} Returns the initialized clone. - */ - function initCloneArray(array) { - var length = array.length, - result = array.constructor(length); - - // Add properties assigned by `RegExp#exec`. - if (length && typeof array[0] == 'string' && hasOwnProperty.call(array, 'index')) { - result.index = array.index; - result.input = array.input; - } - return result; - } - - /** - * Initializes an object clone. - * - * @private - * @param {Object} object The object to clone. - * @returns {Object} Returns the initialized clone. - */ - function initCloneObject(object) { - return (typeof object.constructor == 'function' && !isPrototype(object)) - ? baseCreate(getPrototypeOf(object)) - : {}; - } - - /** - * Initializes an object clone based on its `toStringTag`. - * - * **Note:** This function only supports cloning values with tags of - * `Boolean`, `Date`, `Error`, `Number`, `RegExp`, or `String`. - * - * @private - * @param {Object} object The object to clone. - * @param {string} tag The `toStringTag` of the object to clone. - * @param {boolean} [isDeep] Specify a deep clone. - * @returns {Object} Returns the initialized clone. - */ - function initCloneByTag(object, tag, isDeep) { - var Ctor = object.constructor; - switch (tag) { - case arrayBufferTag: - return cloneArrayBuffer(object); - - case boolTag: - case dateTag: - return new Ctor(+object); - - case float32Tag: case float64Tag: - case int8Tag: case int16Tag: case int32Tag: - case uint8Tag: case uint8ClampedTag: case uint16Tag: case uint32Tag: - return cloneTypedArray(object, isDeep); - - case mapTag: - return cloneMap(object); - - case numberTag: - case stringTag: - return new Ctor(object); - - case regexpTag: - return cloneRegExp(object); - - case setTag: - return cloneSet(object); - - case symbolTag: - return cloneSymbol(object); - } - } - - /** - * Creates an array of index keys for `object` values of arrays, - * `arguments` objects, and strings, otherwise `null` is returned. - * - * @private - * @param {Object} object The object to query. - * @returns {Array|null} Returns index keys, else `null`. - */ - function indexKeys(object) { - var length = object ? object.length : undefined; - if (isLength(length) && - (isArray(object) || isString(object) || isArguments(object))) { - return baseTimes(length, String); - } - return null; - } - - /** - * Checks if the given arguments are from an iteratee call. - * - * @private - * @param {*} value The potential iteratee value argument. - * @param {*} index The potential iteratee index or key argument. - * @param {*} object The potential iteratee object argument. - * @returns {boolean} Returns `true` if the arguments are from an iteratee call, else `false`. - */ - function isIterateeCall(value, index, object) { - if (!isObject(object)) { - return false; - } - var type = typeof index; - if (type == 'number' - ? (isArrayLike(object) && isIndex(index, object.length)) - : (type == 'string' && index in object)) { - return eq(object[index], value); - } - return false; - } - - /** - * Checks if `value` is a property name and not a property path. - * - * @private - * @param {*} value The value to check. - * @param {Object} [object] The object to query keys on. - * @returns {boolean} Returns `true` if `value` is a property name, else `false`. - */ - function isKey(value, object) { - if (typeof value == 'number') { - return true; - } - return !isArray(value) && - (reIsPlainProp.test(value) || !reIsDeepProp.test(value) || - (object != null && value in Object(object))); - } - - /** - * Checks if `value` is suitable for use as unique object key. - * - * @private - * @param {*} value The value to check. - * @returns {boolean} Returns `true` if `value` is suitable, else `false`. - */ - function isKeyable(value) { - var type = typeof value; - return type == 'number' || type == 'boolean' || - (type == 'string' && value != '__proto__') || value == null; - } - - /** - * Checks if `func` has a lazy counterpart. - * - * @private - * @param {Function} func The function to check. - * @returns {boolean} Returns `true` if `func` has a lazy counterpart, else `false`. - */ - function isLaziable(func) { - var funcName = getFuncName(func), - other = lodash[funcName]; - - if (typeof other != 'function' || !(funcName in LazyWrapper.prototype)) { - return false; - } - if (func === other) { - return true; - } - var data = getData(other); - return !!data && func === data[0]; - } - - /** - * Checks if `value` is likely a prototype object. - * - * @private - * @param {*} value The value to check. - * @returns {boolean} Returns `true` if `value` is a prototype, else `false`. - */ - function isPrototype(value) { - var Ctor = value && value.constructor, - proto = (typeof Ctor == 'function' && Ctor.prototype) || objectProto; - - return value === proto; - } - - /** - * Checks if `value` is suitable for strict equality comparisons, i.e. `===`. - * - * @private - * @param {*} value The value to check. - * @returns {boolean} Returns `true` if `value` if suitable for strict - * equality comparisons, else `false`. - */ - function isStrictComparable(value) { - return value === value && !isObject(value); - } - - /** - * Merges the function metadata of `source` into `data`. - * - * Merging metadata reduces the number of wrappers used to invoke a function. - * This is possible because methods like `_.bind`, `_.curry`, and `_.partial` - * may be applied regardless of execution order. Methods like `_.ary` and `_.rearg` - * modify function arguments, making the order in which they are executed important, - * preventing the merging of metadata. However, we make an exception for a safe - * combined case where curried functions have `_.ary` and or `_.rearg` applied. - * - * @private - * @param {Array} data The destination metadata. - * @param {Array} source The source metadata. - * @returns {Array} Returns `data`. - */ - function mergeData(data, source) { - var bitmask = data[1], - srcBitmask = source[1], - newBitmask = bitmask | srcBitmask, - isCommon = newBitmask < (BIND_FLAG | BIND_KEY_FLAG | ARY_FLAG); - - var isCombo = - ((srcBitmask == ARY_FLAG) && (bitmask == CURRY_FLAG)) || - ((srcBitmask == ARY_FLAG) && (bitmask == REARG_FLAG) && (data[7].length <= source[8])) || - ((srcBitmask == (ARY_FLAG | REARG_FLAG)) && (source[7].length <= source[8]) && (bitmask == CURRY_FLAG)); - - // Exit early if metadata can't be merged. - if (!(isCommon || isCombo)) { - return data; - } - // Use source `thisArg` if available. - if (srcBitmask & BIND_FLAG) { - data[2] = source[2]; - // Set when currying a bound function. - newBitmask |= bitmask & BIND_FLAG ? 0 : CURRY_BOUND_FLAG; - } - // Compose partial arguments. - var value = source[3]; - if (value) { - var partials = data[3]; - data[3] = partials ? composeArgs(partials, value, source[4]) : copyArray(value); - data[4] = partials ? replaceHolders(data[3], PLACEHOLDER) : copyArray(source[4]); - } - // Compose partial right arguments. - value = source[5]; - if (value) { - partials = data[5]; - data[5] = partials ? composeArgsRight(partials, value, source[6]) : copyArray(value); - data[6] = partials ? replaceHolders(data[5], PLACEHOLDER) : copyArray(source[6]); - } - // Use source `argPos` if available. - value = source[7]; - if (value) { - data[7] = copyArray(value); - } - // Use source `ary` if it's smaller. - if (srcBitmask & ARY_FLAG) { - data[8] = data[8] == null ? source[8] : nativeMin(data[8], source[8]); - } - // Use source `arity` if one is not provided. - if (data[9] == null) { - data[9] = source[9]; - } - // Use source `func` and merge bitmasks. - data[0] = source[0]; - data[1] = newBitmask; - - return data; - } - - /** - * Used by `_.defaultsDeep` to customize its `_.merge` use. - * - * @private - * @param {*} objValue The destination value. - * @param {*} srcValue The source value. - * @param {string} key The key of the property to merge. - * @param {Object} object The parent object of `objValue`. - * @param {Object} source The parent object of `srcValue`. - * @param {Object} [stack] Tracks traversed source values and their merged counterparts. - * @returns {*} Returns the value to assign. - */ - function mergeDefaults(objValue, srcValue, key, object, source, stack) { - if (isObject(objValue) && isObject(srcValue)) { - baseMerge(objValue, srcValue, undefined, mergeDefaults, stack.set(srcValue, objValue)); - } - return objValue; - } - - /** - * Gets the parent value at `path` of `object`. - * - * @private - * @param {Object} object The object to query. - * @param {Array} path The path to get the parent value of. - * @returns {*} Returns the parent value. - */ - function parent(object, path) { - return path.length == 1 ? object : get(object, baseSlice(path, 0, -1)); - } - - /** - * Reorder `array` according to the specified indexes where the element at - * the first index is assigned as the first element, the element at - * the second index is assigned as the second element, and so on. - * - * @private - * @param {Array} array The array to reorder. - * @param {Array} indexes The arranged array indexes. - * @returns {Array} Returns `array`. - */ - function reorder(array, indexes) { - var arrLength = array.length, - length = nativeMin(indexes.length, arrLength), - oldArray = copyArray(array); - - while (length--) { - var index = indexes[length]; - array[length] = isIndex(index, arrLength) ? oldArray[index] : undefined; - } - return array; - } - - /** - * Sets metadata for `func`. - * - * **Note:** If this function becomes hot, i.e. is invoked a lot in a short - * period of time, it will trip its breaker and transition to an identity function - * to avoid garbage collection pauses in V8. See [V8 issue 2070](https://code.google.com/p/v8/issues/detail?id=2070) - * for more details. - * - * @private - * @param {Function} func The function to associate metadata with. - * @param {*} data The metadata. - * @returns {Function} Returns `func`. - */ - var setData = (function() { - var count = 0, - lastCalled = 0; - - return function(key, value) { - var stamp = now(), - remaining = HOT_SPAN - (stamp - lastCalled); - - lastCalled = stamp; - if (remaining > 0) { - if (++count >= HOT_COUNT) { - return key; - } - } else { - count = 0; - } - return baseSetData(key, value); - }; - }()); - - /** - * Converts `string` to a property path array. - * - * @private - * @param {string} string The string to convert. - * @returns {Array} Returns the property path array. - */ - function stringToPath(string) { - var result = []; - toString(string).replace(rePropName, function(match, number, quote, string) { - result.push(quote ? string.replace(reEscapeChar, '$1') : (number || match)); - }); - return result; - } - - /** - * Creates a clone of `wrapper`. - * - * @private - * @param {Object} wrapper The wrapper to clone. - * @returns {Object} Returns the cloned wrapper. - */ - function wrapperClone(wrapper) { - if (wrapper instanceof LazyWrapper) { - return wrapper.clone(); - } - var result = new LodashWrapper(wrapper.__wrapped__, wrapper.__chain__); - result.__actions__ = copyArray(wrapper.__actions__); - result.__index__ = wrapper.__index__; - result.__values__ = wrapper.__values__; - return result; - } - - /*------------------------------------------------------------------------*/ - - /** - * Creates an array of elements split into groups the length of `size`. - * If `array` can't be split evenly, the final chunk will be the remaining - * elements. - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The array to process. - * @param {number} [size=0] The length of each chunk. - * @returns {Array} Returns the new array containing chunks. - * @example - * - * _.chunk(['a', 'b', 'c', 'd'], 2); - * // => [['a', 'b'], ['c', 'd']] - * - * _.chunk(['a', 'b', 'c', 'd'], 3); - * // => [['a', 'b', 'c'], ['d']] - */ - function chunk(array, size) { - size = nativeMax(toInteger(size), 0); - - var length = array ? array.length : 0; - if (!length || size < 1) { - return []; - } - var index = 0, - resIndex = 0, - result = Array(nativeCeil(length / size)); - - while (index < length) { - result[resIndex++] = baseSlice(array, index, (index += size)); - } - return result; - } - - /** - * Creates an array with all falsey values removed. The values `false`, `null`, - * `0`, `""`, `undefined`, and `NaN` are falsey. - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The array to compact. - * @returns {Array} Returns the new array of filtered values. - * @example - * - * _.compact([0, 1, false, 2, '', 3]); - * // => [1, 2, 3] - */ - function compact(array) { - var index = -1, - length = array ? array.length : 0, - resIndex = 0, - result = []; - - while (++index < length) { - var value = array[index]; - if (value) { - result[resIndex++] = value; - } - } - return result; - } - - /** - * Creates a new array concatenating `array` with any additional arrays - * and/or values. - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The array to concatenate. - * @param {...*} [values] The values to concatenate. - * @returns {Array} Returns the new concatenated array. - * @example - * - * var array = [1]; - * var other = _.concat(array, 2, [3], [[4]]); - * - * console.log(other); - * // => [1, 2, 3, [4]] - * - * console.log(array); - * // => [1] - */ - var concat = rest(function(array, values) { - if (!isArray(array)) { - array = array == null ? [] : [Object(array)]; - } - values = baseFlatten(values, 1); - return arrayConcat(array, values); - }); - - /** - * Creates an array of unique `array` values not included in the other - * given arrays using [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero) - * for equality comparisons. The order of result values is determined by the - * order they occur in the first array. - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The array to inspect. - * @param {...Array} [values] The values to exclude. - * @returns {Array} Returns the new array of filtered values. - * @example - * - * _.difference([3, 2, 1], [4, 2]); - * // => [3, 1] - */ - var difference = rest(function(array, values) { - return isArrayLikeObject(array) - ? baseDifference(array, baseFlatten(values, 1, true)) - : []; - }); - - /** - * This method is like `_.difference` except that it accepts `iteratee` which - * is invoked for each element of `array` and `values` to generate the criterion - * by which they're compared. Result values are chosen from the first array. - * The iteratee is invoked with one argument: (value). - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The array to inspect. - * @param {...Array} [values] The values to exclude. - * @param {Function|Object|string} [iteratee=_.identity] The iteratee invoked per element. - * @returns {Array} Returns the new array of filtered values. - * @example - * - * _.differenceBy([3.1, 2.2, 1.3], [4.4, 2.5], Math.floor); - * // => [3.1, 1.3] - * - * // The `_.property` iteratee shorthand. - * _.differenceBy([{ 'x': 2 }, { 'x': 1 }], [{ 'x': 1 }], 'x'); - * // => [{ 'x': 2 }] - */ - var differenceBy = rest(function(array, values) { - var iteratee = last(values); - if (isArrayLikeObject(iteratee)) { - iteratee = undefined; - } - return isArrayLikeObject(array) - ? baseDifference(array, baseFlatten(values, 1, true), getIteratee(iteratee)) - : []; - }); - - /** - * This method is like `_.difference` except that it accepts `comparator` - * which is invoked to compare elements of `array` to `values`. Result values - * are chosen from the first array. The comparator is invoked with two arguments: - * (arrVal, othVal). - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The array to inspect. - * @param {...Array} [values] The values to exclude. - * @param {Function} [comparator] The comparator invoked per element. - * @returns {Array} Returns the new array of filtered values. - * @example - * - * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }]; - * - * _.differenceWith(objects, [{ 'x': 1, 'y': 2 }], _.isEqual); - * // => [{ 'x': 2, 'y': 1 }] - */ - var differenceWith = rest(function(array, values) { - var comparator = last(values); - if (isArrayLikeObject(comparator)) { - comparator = undefined; - } - return isArrayLikeObject(array) - ? baseDifference(array, baseFlatten(values, 1, true), undefined, comparator) - : []; - }); - - /** - * Creates a slice of `array` with `n` elements dropped from the beginning. - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The array to query. - * @param {number} [n=1] The number of elements to drop. - * @param- {Object} [guard] Enables use as an iteratee for functions like `_.map`. - * @returns {Array} Returns the slice of `array`. - * @example - * - * _.drop([1, 2, 3]); - * // => [2, 3] - * - * _.drop([1, 2, 3], 2); - * // => [3] - * - * _.drop([1, 2, 3], 5); - * // => [] - * - * _.drop([1, 2, 3], 0); - * // => [1, 2, 3] - */ - function drop(array, n, guard) { - var length = array ? array.length : 0; - if (!length) { - return []; - } - n = (guard || n === undefined) ? 1 : toInteger(n); - return baseSlice(array, n < 0 ? 0 : n, length); - } - - /** - * Creates a slice of `array` with `n` elements dropped from the end. - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The array to query. - * @param {number} [n=1] The number of elements to drop. - * @param- {Object} [guard] Enables use as an iteratee for functions like `_.map`. - * @returns {Array} Returns the slice of `array`. - * @example - * - * _.dropRight([1, 2, 3]); - * // => [1, 2] - * - * _.dropRight([1, 2, 3], 2); - * // => [1] - * - * _.dropRight([1, 2, 3], 5); - * // => [] - * - * _.dropRight([1, 2, 3], 0); - * // => [1, 2, 3] - */ - function dropRight(array, n, guard) { - var length = array ? array.length : 0; - if (!length) { - return []; - } - n = (guard || n === undefined) ? 1 : toInteger(n); - n = length - n; - return baseSlice(array, 0, n < 0 ? 0 : n); - } - - /** - * Creates a slice of `array` excluding elements dropped from the end. - * Elements are dropped until `predicate` returns falsey. The predicate is - * invoked with three arguments: (value, index, array). - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The array to query. - * @param {Function|Object|string} [predicate=_.identity] The function invoked per iteration. - * @returns {Array} Returns the slice of `array`. - * @example - * - * var users = [ - * { 'user': 'barney', 'active': true }, - * { 'user': 'fred', 'active': false }, - * { 'user': 'pebbles', 'active': false } - * ]; - * - * _.dropRightWhile(users, function(o) { return !o.active; }); - * // => objects for ['barney'] - * - * // The `_.matches` iteratee shorthand. - * _.dropRightWhile(users, { 'user': 'pebbles', 'active': false }); - * // => objects for ['barney', 'fred'] - * - * // The `_.matchesProperty` iteratee shorthand. - * _.dropRightWhile(users, ['active', false]); - * // => objects for ['barney'] - * - * // The `_.property` iteratee shorthand. - * _.dropRightWhile(users, 'active'); - * // => objects for ['barney', 'fred', 'pebbles'] - */ - function dropRightWhile(array, predicate) { - return (array && array.length) - ? baseWhile(array, getIteratee(predicate, 3), true, true) - : []; - } - - /** - * Creates a slice of `array` excluding elements dropped from the beginning. - * Elements are dropped until `predicate` returns falsey. The predicate is - * invoked with three arguments: (value, index, array). - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The array to query. - * @param {Function|Object|string} [predicate=_.identity] The function invoked per iteration. - * @returns {Array} Returns the slice of `array`. - * @example - * - * var users = [ - * { 'user': 'barney', 'active': false }, - * { 'user': 'fred', 'active': false }, - * { 'user': 'pebbles', 'active': true } - * ]; - * - * _.dropWhile(users, function(o) { return !o.active; }); - * // => objects for ['pebbles'] - * - * // The `_.matches` iteratee shorthand. - * _.dropWhile(users, { 'user': 'barney', 'active': false }); - * // => objects for ['fred', 'pebbles'] - * - * // The `_.matchesProperty` iteratee shorthand. - * _.dropWhile(users, ['active', false]); - * // => objects for ['pebbles'] - * - * // The `_.property` iteratee shorthand. - * _.dropWhile(users, 'active'); - * // => objects for ['barney', 'fred', 'pebbles'] - */ - function dropWhile(array, predicate) { - return (array && array.length) - ? baseWhile(array, getIteratee(predicate, 3), true) - : []; - } - - /** - * Fills elements of `array` with `value` from `start` up to, but not - * including, `end`. - * - * **Note:** This method mutates `array`. - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The array to fill. - * @param {*} value The value to fill `array` with. - * @param {number} [start=0] The start position. - * @param {number} [end=array.length] The end position. - * @returns {Array} Returns `array`. - * @example - * - * var array = [1, 2, 3]; - * - * _.fill(array, 'a'); - * console.log(array); - * // => ['a', 'a', 'a'] - * - * _.fill(Array(3), 2); - * // => [2, 2, 2] - * - * _.fill([4, 6, 8, 10], '*', 1, 3); - * // => [4, '*', '*', 10] - */ - function fill(array, value, start, end) { - var length = array ? array.length : 0; - if (!length) { - return []; - } - if (start && typeof start != 'number' && isIterateeCall(array, value, start)) { - start = 0; - end = length; - } - return baseFill(array, value, start, end); - } - - /** - * This method is like `_.find` except that it returns the index of the first - * element `predicate` returns truthy for instead of the element itself. - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The array to search. - * @param {Function|Object|string} [predicate=_.identity] The function invoked per iteration. - * @returns {number} Returns the index of the found element, else `-1`. - * @example - * - * var users = [ - * { 'user': 'barney', 'active': false }, - * { 'user': 'fred', 'active': false }, - * { 'user': 'pebbles', 'active': true } - * ]; - * - * _.findIndex(users, function(o) { return o.user == 'barney'; }); - * // => 0 - * - * // The `_.matches` iteratee shorthand. - * _.findIndex(users, { 'user': 'fred', 'active': false }); - * // => 1 - * - * // The `_.matchesProperty` iteratee shorthand. - * _.findIndex(users, ['active', false]); - * // => 0 - * - * // The `_.property` iteratee shorthand. - * _.findIndex(users, 'active'); - * // => 2 - */ - function findIndex(array, predicate) { - return (array && array.length) - ? baseFindIndex(array, getIteratee(predicate, 3)) - : -1; - } - - /** - * This method is like `_.findIndex` except that it iterates over elements - * of `collection` from right to left. - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The array to search. - * @param {Function|Object|string} [predicate=_.identity] The function invoked per iteration. - * @returns {number} Returns the index of the found element, else `-1`. - * @example - * - * var users = [ - * { 'user': 'barney', 'active': true }, - * { 'user': 'fred', 'active': false }, - * { 'user': 'pebbles', 'active': false } - * ]; - * - * _.findLastIndex(users, function(o) { return o.user == 'pebbles'; }); - * // => 2 - * - * // The `_.matches` iteratee shorthand. - * _.findLastIndex(users, { 'user': 'barney', 'active': true }); - * // => 0 - * - * // The `_.matchesProperty` iteratee shorthand. - * _.findLastIndex(users, ['active', false]); - * // => 2 - * - * // The `_.property` iteratee shorthand. - * _.findLastIndex(users, 'active'); - * // => 0 - */ - function findLastIndex(array, predicate) { - return (array && array.length) - ? baseFindIndex(array, getIteratee(predicate, 3), true) - : -1; - } - - /** - * Flattens `array` a single level deep. - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The array to flatten. - * @returns {Array} Returns the new flattened array. - * @example - * - * _.flatten([1, [2, [3, [4]], 5]]); - * // => [1, 2, [3, [4]], 5] - */ - function flatten(array) { - var length = array ? array.length : 0; - return length ? baseFlatten(array, 1) : []; - } - - /** - * Recursively flattens `array`. - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The array to flatten. - * @returns {Array} Returns the new flattened array. - * @example - * - * _.flattenDeep([1, [2, [3, [4]], 5]]); - * // => [1, 2, 3, 4, 5] - */ - function flattenDeep(array) { - var length = array ? array.length : 0; - return length ? baseFlatten(array, INFINITY) : []; - } - - /** - * Recursively flatten `array` up to `depth` times. - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The array to flatten. - * @param {number} [depth=1] The maximum recursion depth. - * @returns {Array} Returns the new flattened array. - * @example - * - * var array = [1, [2, [3, [4]], 5]]; - * - * _.flattenDepth(array, 1); - * // => [1, 2, [3, [4]], 5] - * - * _.flattenDepth(array, 2); - * // => [1, 2, 3, [4], 5] - */ - function flattenDepth(array, depth) { - var length = array ? array.length : 0; - if (!length) { - return []; - } - depth = depth === undefined ? 1 : toInteger(depth); - return baseFlatten(array, depth); - } - - /** - * The inverse of `_.toPairs`; this method returns an object composed - * from key-value `pairs`. - * - * @static - * @memberOf _ - * @category Array - * @param {Array} pairs The key-value pairs. - * @returns {Object} Returns the new object. - * @example - * - * _.fromPairs([['fred', 30], ['barney', 40]]); - * // => { 'fred': 30, 'barney': 40 } - */ - function fromPairs(pairs) { - var index = -1, - length = pairs ? pairs.length : 0, - result = {}; - - while (++index < length) { - var pair = pairs[index]; - result[pair[0]] = pair[1]; - } - return result; - } - - /** - * Gets the first element of `array`. - * - * @static - * @memberOf _ - * @alias first - * @category Array - * @param {Array} array The array to query. - * @returns {*} Returns the first element of `array`. - * @example - * - * _.head([1, 2, 3]); - * // => 1 - * - * _.head([]); - * // => undefined - */ - function head(array) { - return array ? array[0] : undefined; - } - - /** - * Gets the index at which the first occurrence of `value` is found in `array` - * using [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero) - * for equality comparisons. If `fromIndex` is negative, it's used as the offset - * from the end of `array`. - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The array to search. - * @param {*} value The value to search for. - * @param {number} [fromIndex=0] The index to search from. - * @returns {number} Returns the index of the matched value, else `-1`. - * @example - * - * _.indexOf([1, 2, 1, 2], 2); - * // => 1 - * - * // Search from the `fromIndex`. - * _.indexOf([1, 2, 1, 2], 2, 2); - * // => 3 - */ - function indexOf(array, value, fromIndex) { - var length = array ? array.length : 0; - if (!length) { - return -1; - } - fromIndex = toInteger(fromIndex); - if (fromIndex < 0) { - fromIndex = nativeMax(length + fromIndex, 0); - } - return baseIndexOf(array, value, fromIndex); - } - - /** - * Gets all but the last element of `array`. - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The array to query. - * @returns {Array} Returns the slice of `array`. - * @example - * - * _.initial([1, 2, 3]); - * // => [1, 2] - */ - function initial(array) { - return dropRight(array, 1); - } - - /** - * Creates an array of unique values that are included in all given arrays - * using [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero) - * for equality comparisons. The order of result values is determined by the - * order they occur in the first array. - * - * @static - * @memberOf _ - * @category Array - * @param {...Array} [arrays] The arrays to inspect. - * @returns {Array} Returns the new array of intersecting values. - * @example - * - * _.intersection([2, 1], [4, 2], [1, 2]); - * // => [2] - */ - var intersection = rest(function(arrays) { - var mapped = arrayMap(arrays, baseCastArrayLikeObject); - return (mapped.length && mapped[0] === arrays[0]) - ? baseIntersection(mapped) - : []; - }); - - /** - * This method is like `_.intersection` except that it accepts `iteratee` - * which is invoked for each element of each `arrays` to generate the criterion - * by which they're compared. Result values are chosen from the first array. - * The iteratee is invoked with one argument: (value). - * - * @static - * @memberOf _ - * @category Array - * @param {...Array} [arrays] The arrays to inspect. - * @param {Function|Object|string} [iteratee=_.identity] The iteratee invoked per element. - * @returns {Array} Returns the new array of intersecting values. - * @example - * - * _.intersectionBy([2.1, 1.2], [4.3, 2.4], Math.floor); - * // => [2.1] - * - * // The `_.property` iteratee shorthand. - * _.intersectionBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x'); - * // => [{ 'x': 1 }] - */ - var intersectionBy = rest(function(arrays) { - var iteratee = last(arrays), - mapped = arrayMap(arrays, baseCastArrayLikeObject); - - if (iteratee === last(mapped)) { - iteratee = undefined; - } else { - mapped.pop(); - } - return (mapped.length && mapped[0] === arrays[0]) - ? baseIntersection(mapped, getIteratee(iteratee)) - : []; - }); - - /** - * This method is like `_.intersection` except that it accepts `comparator` - * which is invoked to compare elements of `arrays`. Result values are chosen - * from the first array. The comparator is invoked with two arguments: - * (arrVal, othVal). - * - * @static - * @memberOf _ - * @category Array - * @param {...Array} [arrays] The arrays to inspect. - * @param {Function} [comparator] The comparator invoked per element. - * @returns {Array} Returns the new array of intersecting values. - * @example - * - * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }]; - * var others = [{ 'x': 1, 'y': 1 }, { 'x': 1, 'y': 2 }]; - * - * _.intersectionWith(objects, others, _.isEqual); - * // => [{ 'x': 1, 'y': 2 }] - */ - var intersectionWith = rest(function(arrays) { - var comparator = last(arrays), - mapped = arrayMap(arrays, baseCastArrayLikeObject); - - if (comparator === last(mapped)) { - comparator = undefined; - } else { - mapped.pop(); - } - return (mapped.length && mapped[0] === arrays[0]) - ? baseIntersection(mapped, undefined, comparator) - : []; - }); - - /** - * Converts all elements in `array` into a string separated by `separator`. - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The array to convert. - * @param {string} [separator=','] The element separator. - * @returns {string} Returns the joined string. - * @example - * - * _.join(['a', 'b', 'c'], '~'); - * // => 'a~b~c' - */ - function join(array, separator) { - return array ? nativeJoin.call(array, separator) : ''; - } - - /** - * Gets the last element of `array`. - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The array to query. - * @returns {*} Returns the last element of `array`. - * @example - * - * _.last([1, 2, 3]); - * // => 3 - */ - function last(array) { - var length = array ? array.length : 0; - return length ? array[length - 1] : undefined; - } - - /** - * This method is like `_.indexOf` except that it iterates over elements of - * `array` from right to left. - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The array to search. - * @param {*} value The value to search for. - * @param {number} [fromIndex=array.length-1] The index to search from. - * @returns {number} Returns the index of the matched value, else `-1`. - * @example - * - * _.lastIndexOf([1, 2, 1, 2], 2); - * // => 3 - * - * // Search from the `fromIndex`. - * _.lastIndexOf([1, 2, 1, 2], 2, 2); - * // => 1 - */ - function lastIndexOf(array, value, fromIndex) { - var length = array ? array.length : 0; - if (!length) { - return -1; - } - var index = length; - if (fromIndex !== undefined) { - index = toInteger(fromIndex); - index = (index < 0 ? nativeMax(length + index, 0) : nativeMin(index, length - 1)) + 1; - } - if (value !== value) { - return indexOfNaN(array, index, true); - } - while (index--) { - if (array[index] === value) { - return index; - } - } - return -1; - } - - /** - * Removes all given values from `array` using - * [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero) - * for equality comparisons. - * - * **Note:** Unlike `_.without`, this method mutates `array`. Use `_.remove` - * to remove elements from an array by predicate. - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The array to modify. - * @param {...*} [values] The values to remove. - * @returns {Array} Returns `array`. - * @example - * - * var array = [1, 2, 3, 1, 2, 3]; - * - * _.pull(array, 2, 3); - * console.log(array); - * // => [1, 1] - */ - var pull = rest(pullAll); - - /** - * This method is like `_.pull` except that it accepts an array of values to remove. - * - * **Note:** Unlike `_.difference`, this method mutates `array`. - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The array to modify. - * @param {Array} values The values to remove. - * @returns {Array} Returns `array`. - * @example - * - * var array = [1, 2, 3, 1, 2, 3]; - * - * _.pullAll(array, [2, 3]); - * console.log(array); - * // => [1, 1] - */ - function pullAll(array, values) { - return (array && array.length && values && values.length) - ? basePullAll(array, values) - : array; - } - - /** - * This method is like `_.pullAll` except that it accepts `iteratee` which is - * invoked for each element of `array` and `values` to generate the criterion - * by which they're compared. The iteratee is invoked with one argument: (value). - * - * **Note:** Unlike `_.differenceBy`, this method mutates `array`. - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The array to modify. - * @param {Array} values The values to remove. - * @param {Function|Object|string} [iteratee=_.identity] The iteratee invoked per element. - * @returns {Array} Returns `array`. - * @example - * - * var array = [{ 'x': 1 }, { 'x': 2 }, { 'x': 3 }, { 'x': 1 }]; - * - * _.pullAllBy(array, [{ 'x': 1 }, { 'x': 3 }], 'x'); - * console.log(array); - * // => [{ 'x': 2 }] - */ - function pullAllBy(array, values, iteratee) { - return (array && array.length && values && values.length) - ? basePullAll(array, values, getIteratee(iteratee)) - : array; - } - - /** - * This method is like `_.pullAll` except that it accepts `comparator` which - * is invoked to compare elements of `array` to `values`. The comparator is - * invoked with two arguments: (arrVal, othVal). - * - * **Note:** Unlike `_.differenceWith`, this method mutates `array`. - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The array to modify. - * @param {Array} values The values to remove. - * @param {Function} [comparator] The comparator invoked per element. - * @returns {Array} Returns `array`. - * @example - * - * var array = [{ 'x': 1, 'y': 2 }, { 'x': 3, 'y': 4 }, { 'x': 5, 'y': 6 }]; - * - * _.pullAllWith(array, [{ 'x': 3, 'y': 4 }], _.isEqual); - * console.log(array); - * // => [{ 'x': 1, 'y': 2 }, { 'x': 5, 'y': 6 }] - */ - function pullAllWith(array, values, comparator) { - return (array && array.length && values && values.length) - ? basePullAll(array, values, undefined, comparator) - : array; - } - - /** - * Removes elements from `array` corresponding to `indexes` and returns an - * array of removed elements. - * - * **Note:** Unlike `_.at`, this method mutates `array`. - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The array to modify. - * @param {...(number|number[])} [indexes] The indexes of elements to remove, - * specified individually or in arrays. - * @returns {Array} Returns the new array of removed elements. - * @example - * - * var array = [5, 10, 15, 20]; - * var evens = _.pullAt(array, 1, 3); - * - * console.log(array); - * // => [5, 15] - * - * console.log(evens); - * // => [10, 20] - */ - var pullAt = rest(function(array, indexes) { - indexes = arrayMap(baseFlatten(indexes, 1), String); - - var result = baseAt(array, indexes); - basePullAt(array, indexes.sort(compareAscending)); - return result; - }); - - /** - * Removes all elements from `array` that `predicate` returns truthy for - * and returns an array of the removed elements. The predicate is invoked - * with three arguments: (value, index, array). - * - * **Note:** Unlike `_.filter`, this method mutates `array`. Use `_.pull` - * to pull elements from an array by value. - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The array to modify. - * @param {Function|Object|string} [predicate=_.identity] The function invoked per iteration. - * @returns {Array} Returns the new array of removed elements. - * @example - * - * var array = [1, 2, 3, 4]; - * var evens = _.remove(array, function(n) { - * return n % 2 == 0; - * }); - * - * console.log(array); - * // => [1, 3] - * - * console.log(evens); - * // => [2, 4] - */ - function remove(array, predicate) { - var result = []; - if (!(array && array.length)) { - return result; - } - var index = -1, - indexes = [], - length = array.length; - - predicate = getIteratee(predicate, 3); - while (++index < length) { - var value = array[index]; - if (predicate(value, index, array)) { - result.push(value); - indexes.push(index); - } - } - basePullAt(array, indexes); - return result; - } - - /** - * Reverses `array` so that the first element becomes the last, the second - * element becomes the second to last, and so on. - * - * **Note:** This method mutates `array` and is based on - * [`Array#reverse`](https://mdn.io/Array/reverse). - * - * @static - * @memberOf _ - * @category Array - * @returns {Array} Returns `array`. - * @example - * - * var array = [1, 2, 3]; - * - * _.reverse(array); - * // => [3, 2, 1] - * - * console.log(array); - * // => [3, 2, 1] - */ - function reverse(array) { - return array ? nativeReverse.call(array) : array; - } - - /** - * Creates a slice of `array` from `start` up to, but not including, `end`. - * - * **Note:** This method is used instead of [`Array#slice`](https://mdn.io/Array/slice) - * to ensure dense arrays are returned. - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The array to slice. - * @param {number} [start=0] The start position. - * @param {number} [end=array.length] The end position. - * @returns {Array} Returns the slice of `array`. - */ - function slice(array, start, end) { - var length = array ? array.length : 0; - if (!length) { - return []; - } - if (end && typeof end != 'number' && isIterateeCall(array, start, end)) { - start = 0; - end = length; - } - else { - start = start == null ? 0 : toInteger(start); - end = end === undefined ? length : toInteger(end); - } - return baseSlice(array, start, end); - } - - /** - * Uses a binary search to determine the lowest index at which `value` should - * be inserted into `array` in order to maintain its sort order. - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The sorted array to inspect. - * @param {*} value The value to evaluate. - * @returns {number} Returns the index at which `value` should be inserted into `array`. - * @example - * - * _.sortedIndex([30, 50], 40); - * // => 1 - * - * _.sortedIndex([4, 5], 4); - * // => 0 - */ - function sortedIndex(array, value) { - return baseSortedIndex(array, value); - } - - /** - * This method is like `_.sortedIndex` except that it accepts `iteratee` - * which is invoked for `value` and each element of `array` to compute their - * sort ranking. The iteratee is invoked with one argument: (value). - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The sorted array to inspect. - * @param {*} value The value to evaluate. - * @param {Function|Object|string} [iteratee=_.identity] The iteratee invoked per element. - * @returns {number} Returns the index at which `value` should be inserted into `array`. - * @example - * - * var dict = { 'thirty': 30, 'forty': 40, 'fifty': 50 }; - * - * _.sortedIndexBy(['thirty', 'fifty'], 'forty', _.propertyOf(dict)); - * // => 1 - * - * // The `_.property` iteratee shorthand. - * _.sortedIndexBy([{ 'x': 4 }, { 'x': 5 }], { 'x': 4 }, 'x'); - * // => 0 - */ - function sortedIndexBy(array, value, iteratee) { - return baseSortedIndexBy(array, value, getIteratee(iteratee)); - } - - /** - * This method is like `_.indexOf` except that it performs a binary - * search on a sorted `array`. - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The array to search. - * @param {*} value The value to search for. - * @returns {number} Returns the index of the matched value, else `-1`. - * @example - * - * _.sortedIndexOf([1, 1, 2, 2], 2); - * // => 2 - */ - function sortedIndexOf(array, value) { - var length = array ? array.length : 0; - if (length) { - var index = baseSortedIndex(array, value); - if (index < length && eq(array[index], value)) { - return index; - } - } - return -1; - } - - /** - * This method is like `_.sortedIndex` except that it returns the highest - * index at which `value` should be inserted into `array` in order to - * maintain its sort order. - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The sorted array to inspect. - * @param {*} value The value to evaluate. - * @returns {number} Returns the index at which `value` should be inserted into `array`. - * @example - * - * _.sortedLastIndex([4, 5], 4); - * // => 1 - */ - function sortedLastIndex(array, value) { - return baseSortedIndex(array, value, true); - } - - /** - * This method is like `_.sortedLastIndex` except that it accepts `iteratee` - * which is invoked for `value` and each element of `array` to compute their - * sort ranking. The iteratee is invoked with one argument: (value). - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The sorted array to inspect. - * @param {*} value The value to evaluate. - * @param {Function|Object|string} [iteratee=_.identity] The iteratee invoked per element. - * @returns {number} Returns the index at which `value` should be inserted into `array`. - * @example - * - * // The `_.property` iteratee shorthand. - * _.sortedLastIndexBy([{ 'x': 4 }, { 'x': 5 }], { 'x': 4 }, 'x'); - * // => 1 - */ - function sortedLastIndexBy(array, value, iteratee) { - return baseSortedIndexBy(array, value, getIteratee(iteratee), true); - } - - /** - * This method is like `_.lastIndexOf` except that it performs a binary - * search on a sorted `array`. - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The array to search. - * @param {*} value The value to search for. - * @returns {number} Returns the index of the matched value, else `-1`. - * @example - * - * _.sortedLastIndexOf([1, 1, 2, 2], 2); - * // => 3 - */ - function sortedLastIndexOf(array, value) { - var length = array ? array.length : 0; - if (length) { - var index = baseSortedIndex(array, value, true) - 1; - if (eq(array[index], value)) { - return index; - } - } - return -1; - } - - /** - * This method is like `_.uniq` except that it's designed and optimized - * for sorted arrays. - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The array to inspect. - * @returns {Array} Returns the new duplicate free array. - * @example - * - * _.sortedUniq([1, 1, 2]); - * // => [1, 2] - */ - function sortedUniq(array) { - return (array && array.length) - ? baseSortedUniq(array) - : []; - } - - /** - * This method is like `_.uniqBy` except that it's designed and optimized - * for sorted arrays. - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The array to inspect. - * @param {Function} [iteratee] The iteratee invoked per element. - * @returns {Array} Returns the new duplicate free array. - * @example - * - * _.sortedUniqBy([1.1, 1.2, 2.3, 2.4], Math.floor); - * // => [1.1, 2.3] - */ - function sortedUniqBy(array, iteratee) { - return (array && array.length) - ? baseSortedUniqBy(array, getIteratee(iteratee)) - : []; - } - - /** - * Gets all but the first element of `array`. - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The array to query. - * @returns {Array} Returns the slice of `array`. - * @example - * - * _.tail([1, 2, 3]); - * // => [2, 3] - */ - function tail(array) { - return drop(array, 1); - } - - /** - * Creates a slice of `array` with `n` elements taken from the beginning. - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The array to query. - * @param {number} [n=1] The number of elements to take. - * @param- {Object} [guard] Enables use as an iteratee for functions like `_.map`. - * @returns {Array} Returns the slice of `array`. - * @example - * - * _.take([1, 2, 3]); - * // => [1] - * - * _.take([1, 2, 3], 2); - * // => [1, 2] - * - * _.take([1, 2, 3], 5); - * // => [1, 2, 3] - * - * _.take([1, 2, 3], 0); - * // => [] - */ - function take(array, n, guard) { - if (!(array && array.length)) { - return []; - } - n = (guard || n === undefined) ? 1 : toInteger(n); - return baseSlice(array, 0, n < 0 ? 0 : n); - } - - /** - * Creates a slice of `array` with `n` elements taken from the end. - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The array to query. - * @param {number} [n=1] The number of elements to take. - * @param- {Object} [guard] Enables use as an iteratee for functions like `_.map`. - * @returns {Array} Returns the slice of `array`. - * @example - * - * _.takeRight([1, 2, 3]); - * // => [3] - * - * _.takeRight([1, 2, 3], 2); - * // => [2, 3] - * - * _.takeRight([1, 2, 3], 5); - * // => [1, 2, 3] - * - * _.takeRight([1, 2, 3], 0); - * // => [] - */ - function takeRight(array, n, guard) { - var length = array ? array.length : 0; - if (!length) { - return []; - } - n = (guard || n === undefined) ? 1 : toInteger(n); - n = length - n; - return baseSlice(array, n < 0 ? 0 : n, length); - } - - /** - * Creates a slice of `array` with elements taken from the end. Elements are - * taken until `predicate` returns falsey. The predicate is invoked with three - * arguments: (value, index, array). - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The array to query. - * @param {Function|Object|string} [predicate=_.identity] The function invoked per iteration. - * @returns {Array} Returns the slice of `array`. - * @example - * - * var users = [ - * { 'user': 'barney', 'active': true }, - * { 'user': 'fred', 'active': false }, - * { 'user': 'pebbles', 'active': false } - * ]; - * - * _.takeRightWhile(users, function(o) { return !o.active; }); - * // => objects for ['fred', 'pebbles'] - * - * // The `_.matches` iteratee shorthand. - * _.takeRightWhile(users, { 'user': 'pebbles', 'active': false }); - * // => objects for ['pebbles'] - * - * // The `_.matchesProperty` iteratee shorthand. - * _.takeRightWhile(users, ['active', false]); - * // => objects for ['fred', 'pebbles'] - * - * // The `_.property` iteratee shorthand. - * _.takeRightWhile(users, 'active'); - * // => [] - */ - function takeRightWhile(array, predicate) { - return (array && array.length) - ? baseWhile(array, getIteratee(predicate, 3), false, true) - : []; - } - - /** - * Creates a slice of `array` with elements taken from the beginning. Elements - * are taken until `predicate` returns falsey. The predicate is invoked with - * three arguments: (value, index, array). - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The array to query. - * @param {Function|Object|string} [predicate=_.identity] The function invoked per iteration. - * @returns {Array} Returns the slice of `array`. - * @example - * - * var users = [ - * { 'user': 'barney', 'active': false }, - * { 'user': 'fred', 'active': false}, - * { 'user': 'pebbles', 'active': true } - * ]; - * - * _.takeWhile(users, function(o) { return !o.active; }); - * // => objects for ['barney', 'fred'] - * - * // The `_.matches` iteratee shorthand. - * _.takeWhile(users, { 'user': 'barney', 'active': false }); - * // => objects for ['barney'] - * - * // The `_.matchesProperty` iteratee shorthand. - * _.takeWhile(users, ['active', false]); - * // => objects for ['barney', 'fred'] - * - * // The `_.property` iteratee shorthand. - * _.takeWhile(users, 'active'); - * // => [] - */ - function takeWhile(array, predicate) { - return (array && array.length) - ? baseWhile(array, getIteratee(predicate, 3)) - : []; - } - - /** - * Creates an array of unique values, in order, from all given arrays using - * [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero) - * for equality comparisons. - * - * @static - * @memberOf _ - * @category Array - * @param {...Array} [arrays] The arrays to inspect. - * @returns {Array} Returns the new array of combined values. - * @example - * - * _.union([2, 1], [4, 2], [1, 2]); - * // => [2, 1, 4] - */ - var union = rest(function(arrays) { - return baseUniq(baseFlatten(arrays, 1, true)); - }); - - /** - * This method is like `_.union` except that it accepts `iteratee` which is - * invoked for each element of each `arrays` to generate the criterion by which - * uniqueness is computed. The iteratee is invoked with one argument: (value). - * - * @static - * @memberOf _ - * @category Array - * @param {...Array} [arrays] The arrays to inspect. - * @param {Function|Object|string} [iteratee=_.identity] The iteratee invoked per element. - * @returns {Array} Returns the new array of combined values. - * @example - * - * _.unionBy([2.1, 1.2], [4.3, 2.4], Math.floor); - * // => [2.1, 1.2, 4.3] - * - * // The `_.property` iteratee shorthand. - * _.unionBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x'); - * // => [{ 'x': 1 }, { 'x': 2 }] - */ - var unionBy = rest(function(arrays) { - var iteratee = last(arrays); - if (isArrayLikeObject(iteratee)) { - iteratee = undefined; - } - return baseUniq(baseFlatten(arrays, 1, true), getIteratee(iteratee)); - }); - - /** - * This method is like `_.union` except that it accepts `comparator` which - * is invoked to compare elements of `arrays`. The comparator is invoked - * with two arguments: (arrVal, othVal). - * - * @static - * @memberOf _ - * @category Array - * @param {...Array} [arrays] The arrays to inspect. - * @param {Function} [comparator] The comparator invoked per element. - * @returns {Array} Returns the new array of combined values. - * @example - * - * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }]; - * var others = [{ 'x': 1, 'y': 1 }, { 'x': 1, 'y': 2 }]; - * - * _.unionWith(objects, others, _.isEqual); - * // => [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }, { 'x': 1, 'y': 1 }] - */ - var unionWith = rest(function(arrays) { - var comparator = last(arrays); - if (isArrayLikeObject(comparator)) { - comparator = undefined; - } - return baseUniq(baseFlatten(arrays, 1, true), undefined, comparator); - }); - - /** - * Creates a duplicate-free version of an array, using - * [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero) - * for equality comparisons, in which only the first occurrence of each element - * is kept. - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The array to inspect. - * @returns {Array} Returns the new duplicate free array. - * @example - * - * _.uniq([2, 1, 2]); - * // => [2, 1] - */ - function uniq(array) { - return (array && array.length) - ? baseUniq(array) - : []; - } - - /** - * This method is like `_.uniq` except that it accepts `iteratee` which is - * invoked for each element in `array` to generate the criterion by which - * uniqueness is computed. The iteratee is invoked with one argument: (value). - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The array to inspect. - * @param {Function|Object|string} [iteratee=_.identity] The iteratee invoked per element. - * @returns {Array} Returns the new duplicate free array. - * @example - * - * _.uniqBy([2.1, 1.2, 2.3], Math.floor); - * // => [2.1, 1.2] - * - * // The `_.property` iteratee shorthand. - * _.uniqBy([{ 'x': 1 }, { 'x': 2 }, { 'x': 1 }], 'x'); - * // => [{ 'x': 1 }, { 'x': 2 }] - */ - function uniqBy(array, iteratee) { - return (array && array.length) - ? baseUniq(array, getIteratee(iteratee)) - : []; - } - - /** - * This method is like `_.uniq` except that it accepts `comparator` which - * is invoked to compare elements of `array`. The comparator is invoked with - * two arguments: (arrVal, othVal). - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The array to inspect. - * @param {Function} [comparator] The comparator invoked per element. - * @returns {Array} Returns the new duplicate free array. - * @example - * - * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }, { 'x': 1, 'y': 2 }]; - * - * _.uniqWith(objects, _.isEqual); - * // => [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }] - */ - function uniqWith(array, comparator) { - return (array && array.length) - ? baseUniq(array, undefined, comparator) - : []; - } - - /** - * This method is like `_.zip` except that it accepts an array of grouped - * elements and creates an array regrouping the elements to their pre-zip - * configuration. - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The array of grouped elements to process. - * @returns {Array} Returns the new array of regrouped elements. - * @example - * - * var zipped = _.zip(['fred', 'barney'], [30, 40], [true, false]); - * // => [['fred', 30, true], ['barney', 40, false]] - * - * _.unzip(zipped); - * // => [['fred', 'barney'], [30, 40], [true, false]] - */ - function unzip(array) { - if (!(array && array.length)) { - return []; - } - var length = 0; - array = arrayFilter(array, function(group) { - if (isArrayLikeObject(group)) { - length = nativeMax(group.length, length); - return true; - } - }); - return baseTimes(length, function(index) { - return arrayMap(array, baseProperty(index)); - }); - } - - /** - * This method is like `_.unzip` except that it accepts `iteratee` to specify - * how regrouped values should be combined. The iteratee is invoked with the - * elements of each group: (...group). - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The array of grouped elements to process. - * @param {Function} [iteratee=_.identity] The function to combine regrouped values. - * @returns {Array} Returns the new array of regrouped elements. - * @example - * - * var zipped = _.zip([1, 2], [10, 20], [100, 200]); - * // => [[1, 10, 100], [2, 20, 200]] - * - * _.unzipWith(zipped, _.add); - * // => [3, 30, 300] - */ - function unzipWith(array, iteratee) { - if (!(array && array.length)) { - return []; - } - var result = unzip(array); - if (iteratee == null) { - return result; - } - return arrayMap(result, function(group) { - return apply(iteratee, undefined, group); - }); - } - - /** - * Creates an array excluding all given values using - * [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero) - * for equality comparisons. - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The array to filter. - * @param {...*} [values] The values to exclude. - * @returns {Array} Returns the new array of filtered values. - * @example - * - * _.without([1, 2, 1, 3], 1, 2); - * // => [3] - */ - var without = rest(function(array, values) { - return isArrayLikeObject(array) - ? baseDifference(array, values) - : []; - }); - - /** - * Creates an array of unique values that is the [symmetric difference](https://en.wikipedia.org/wiki/Symmetric_difference) - * of the given arrays. The order of result values is determined by the order - * they occur in the arrays. - * - * @static - * @memberOf _ - * @category Array - * @param {...Array} [arrays] The arrays to inspect. - * @returns {Array} Returns the new array of values. - * @example - * - * _.xor([2, 1], [4, 2]); - * // => [1, 4] - */ - var xor = rest(function(arrays) { - return baseXor(arrayFilter(arrays, isArrayLikeObject)); - }); - - /** - * This method is like `_.xor` except that it accepts `iteratee` which is - * invoked for each element of each `arrays` to generate the criterion by which - * by which they're compared. The iteratee is invoked with one argument: (value). - * - * @static - * @memberOf _ - * @category Array - * @param {...Array} [arrays] The arrays to inspect. - * @param {Function|Object|string} [iteratee=_.identity] The iteratee invoked per element. - * @returns {Array} Returns the new array of values. - * @example - * - * _.xorBy([2.1, 1.2], [4.3, 2.4], Math.floor); - * // => [1.2, 4.3] - * - * // The `_.property` iteratee shorthand. - * _.xorBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x'); - * // => [{ 'x': 2 }] - */ - var xorBy = rest(function(arrays) { - var iteratee = last(arrays); - if (isArrayLikeObject(iteratee)) { - iteratee = undefined; - } - return baseXor(arrayFilter(arrays, isArrayLikeObject), getIteratee(iteratee)); - }); - - /** - * This method is like `_.xor` except that it accepts `comparator` which is - * invoked to compare elements of `arrays`. The comparator is invoked with - * two arguments: (arrVal, othVal). - * - * @static - * @memberOf _ - * @category Array - * @param {...Array} [arrays] The arrays to inspect. - * @param {Function} [comparator] The comparator invoked per element. - * @returns {Array} Returns the new array of values. - * @example - * - * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }]; - * var others = [{ 'x': 1, 'y': 1 }, { 'x': 1, 'y': 2 }]; - * - * _.xorWith(objects, others, _.isEqual); - * // => [{ 'x': 2, 'y': 1 }, { 'x': 1, 'y': 1 }] - */ - var xorWith = rest(function(arrays) { - var comparator = last(arrays); - if (isArrayLikeObject(comparator)) { - comparator = undefined; - } - return baseXor(arrayFilter(arrays, isArrayLikeObject), undefined, comparator); - }); - - /** - * Creates an array of grouped elements, the first of which contains the first - * elements of the given arrays, the second of which contains the second elements - * of the given arrays, and so on. - * - * @static - * @memberOf _ - * @category Array - * @param {...Array} [arrays] The arrays to process. - * @returns {Array} Returns the new array of grouped elements. - * @example - * - * _.zip(['fred', 'barney'], [30, 40], [true, false]); - * // => [['fred', 30, true], ['barney', 40, false]] - */ - var zip = rest(unzip); - - /** - * This method is like `_.fromPairs` except that it accepts two arrays, - * one of property names and one of corresponding values. - * - * @static - * @memberOf _ - * @category Array - * @param {Array} [props=[]] The property names. - * @param {Array} [values=[]] The property values. - * @returns {Object} Returns the new object. - * @example - * - * _.zipObject(['a', 'b'], [1, 2]); - * // => { 'a': 1, 'b': 2 } - */ - function zipObject(props, values) { - return baseZipObject(props || [], values || [], assignValue); - } - - /** - * This method is like `_.zipObject` except that it supports property paths. - * - * @static - * @memberOf _ - * @category Array - * @param {Array} [props=[]] The property names. - * @param {Array} [values=[]] The property values. - * @returns {Object} Returns the new object. - * @example - * - * _.zipObjectDeep(['a.b[0].c', 'a.b[1].d'], [1, 2]); - * // => { 'a': { 'b': [{ 'c': 1 }, { 'd': 2 }] } } - */ - function zipObjectDeep(props, values) { - return baseZipObject(props || [], values || [], baseSet); - } - - /** - * This method is like `_.zip` except that it accepts `iteratee` to specify - * how grouped values should be combined. The iteratee is invoked with the - * elements of each group: (...group). - * - * @static - * @memberOf _ - * @category Array - * @param {...Array} [arrays] The arrays to process. - * @param {Function} [iteratee=_.identity] The function to combine grouped values. - * @returns {Array} Returns the new array of grouped elements. - * @example - * - * _.zipWith([1, 2], [10, 20], [100, 200], function(a, b, c) { - * return a + b + c; - * }); - * // => [111, 222] - */ - var zipWith = rest(function(arrays) { - var length = arrays.length, - iteratee = length > 1 ? arrays[length - 1] : undefined; - - iteratee = typeof iteratee == 'function' ? (arrays.pop(), iteratee) : undefined; - return unzipWith(arrays, iteratee); - }); - - /*------------------------------------------------------------------------*/ - - /** - * Creates a `lodash` object that wraps `value` with explicit method chaining enabled. - * The result of such method chaining must be unwrapped with `_#value`. - * - * @static - * @memberOf _ - * @category Seq - * @param {*} value The value to wrap. - * @returns {Object} Returns the new `lodash` wrapper instance. - * @example - * - * var users = [ - * { 'user': 'barney', 'age': 36 }, - * { 'user': 'fred', 'age': 40 }, - * { 'user': 'pebbles', 'age': 1 } - * ]; - * - * var youngest = _ - * .chain(users) - * .sortBy('age') - * .map(function(o) { - * return o.user + ' is ' + o.age; - * }) - * .head() - * .value(); - * // => 'pebbles is 1' - */ - function chain(value) { - var result = lodash(value); - result.__chain__ = true; - return result; - } - - /** - * This method invokes `interceptor` and returns `value`. The interceptor - * is invoked with one argument; (value). The purpose of this method is to - * "tap into" a method chain in order to modify intermediate results. - * - * @static - * @memberOf _ - * @category Seq - * @param {*} value The value to provide to `interceptor`. - * @param {Function} interceptor The function to invoke. - * @returns {*} Returns `value`. - * @example - * - * _([1, 2, 3]) - * .tap(function(array) { - * // Mutate input array. - * array.pop(); - * }) - * .reverse() - * .value(); - * // => [2, 1] - */ - function tap(value, interceptor) { - interceptor(value); - return value; - } - - /** - * This method is like `_.tap` except that it returns the result of `interceptor`. - * The purpose of this method is to "pass thru" values replacing intermediate - * results in a method chain. - * - * @static - * @memberOf _ - * @category Seq - * @param {*} value The value to provide to `interceptor`. - * @param {Function} interceptor The function to invoke. - * @returns {*} Returns the result of `interceptor`. - * @example - * - * _(' abc ') - * .chain() - * .trim() - * .thru(function(value) { - * return [value]; - * }) - * .value(); - * // => ['abc'] - */ - function thru(value, interceptor) { - return interceptor(value); - } - - /** - * This method is the wrapper version of `_.at`. - * - * @name at - * @memberOf _ - * @category Seq - * @param {...(string|string[])} [paths] The property paths of elements to pick, - * specified individually or in arrays. - * @returns {Object} Returns the new `lodash` wrapper instance. - * @example - * - * var object = { 'a': [{ 'b': { 'c': 3 } }, 4] }; - * - * _(object).at(['a[0].b.c', 'a[1]']).value(); - * // => [3, 4] - * - * _(['a', 'b', 'c']).at(0, 2).value(); - * // => ['a', 'c'] - */ - var wrapperAt = rest(function(paths) { - paths = baseFlatten(paths, 1); - var length = paths.length, - start = length ? paths[0] : 0, - value = this.__wrapped__, - interceptor = function(object) { return baseAt(object, paths); }; - - if (length > 1 || this.__actions__.length || - !(value instanceof LazyWrapper) || !isIndex(start)) { - return this.thru(interceptor); - } - value = value.slice(start, +start + (length ? 1 : 0)); - value.__actions__.push({ - 'func': thru, - 'args': [interceptor], - 'thisArg': undefined - }); - return new LodashWrapper(value, this.__chain__).thru(function(array) { - if (length && !array.length) { - array.push(undefined); - } - return array; - }); - }); - - /** - * Enables explicit method chaining on the wrapper object. - * - * @name chain - * @memberOf _ - * @category Seq - * @returns {Object} Returns the new `lodash` wrapper instance. - * @example - * - * var users = [ - * { 'user': 'barney', 'age': 36 }, - * { 'user': 'fred', 'age': 40 } - * ]; - * - * // A sequence without explicit chaining. - * _(users).head(); - * // => { 'user': 'barney', 'age': 36 } - * - * // A sequence with explicit chaining. - * _(users) - * .chain() - * .head() - * .pick('user') - * .value(); - * // => { 'user': 'barney' } - */ - function wrapperChain() { - return chain(this); - } - - /** - * Executes the chained sequence and returns the wrapped result. - * - * @name commit - * @memberOf _ - * @category Seq - * @returns {Object} Returns the new `lodash` wrapper instance. - * @example - * - * var array = [1, 2]; - * var wrapped = _(array).push(3); - * - * console.log(array); - * // => [1, 2] - * - * wrapped = wrapped.commit(); - * console.log(array); - * // => [1, 2, 3] - * - * wrapped.last(); - * // => 3 - * - * console.log(array); - * // => [1, 2, 3] - */ - function wrapperCommit() { - return new LodashWrapper(this.value(), this.__chain__); - } - - /** - * This method is the wrapper version of `_.flatMap`. - * - * @name flatMap - * @memberOf _ - * @category Seq - * @param {Function|Object|string} [iteratee=_.identity] The function invoked per iteration. - * @returns {Object} Returns the new `lodash` wrapper instance. - * @example - * - * function duplicate(n) { - * return [n, n]; - * } - * - * _([1, 2]).flatMap(duplicate).value(); - * // => [1, 1, 2, 2] - */ - function wrapperFlatMap(iteratee) { - return this.map(iteratee).flatten(); - } - - /** - * Gets the next value on a wrapped object following the - * [iterator protocol](https://mdn.io/iteration_protocols#iterator). - * - * @name next - * @memberOf _ - * @category Seq - * @returns {Object} Returns the next iterator value. - * @example - * - * var wrapped = _([1, 2]); - * - * wrapped.next(); - * // => { 'done': false, 'value': 1 } - * - * wrapped.next(); - * // => { 'done': false, 'value': 2 } - * - * wrapped.next(); - * // => { 'done': true, 'value': undefined } - */ - function wrapperNext() { - if (this.__values__ === undefined) { - this.__values__ = toArray(this.value()); - } - var done = this.__index__ >= this.__values__.length, - value = done ? undefined : this.__values__[this.__index__++]; - - return { 'done': done, 'value': value }; - } - - /** - * Enables the wrapper to be iterable. - * - * @name Symbol.iterator - * @memberOf _ - * @category Seq - * @returns {Object} Returns the wrapper object. - * @example - * - * var wrapped = _([1, 2]); - * - * wrapped[Symbol.iterator]() === wrapped; - * // => true - * - * Array.from(wrapped); - * // => [1, 2] - */ - function wrapperToIterator() { - return this; - } - - /** - * Creates a clone of the chained sequence planting `value` as the wrapped value. - * - * @name plant - * @memberOf _ - * @category Seq - * @param {*} value The value to plant. - * @returns {Object} Returns the new `lodash` wrapper instance. - * @example - * - * function square(n) { - * return n * n; - * } - * - * var wrapped = _([1, 2]).map(square); - * var other = wrapped.plant([3, 4]); - * - * other.value(); - * // => [9, 16] - * - * wrapped.value(); - * // => [1, 4] - */ - function wrapperPlant(value) { - var result, - parent = this; - - while (parent instanceof baseLodash) { - var clone = wrapperClone(parent); - clone.__index__ = 0; - clone.__values__ = undefined; - if (result) { - previous.__wrapped__ = clone; - } else { - result = clone; - } - var previous = clone; - parent = parent.__wrapped__; - } - previous.__wrapped__ = value; - return result; - } - - /** - * This method is the wrapper version of `_.reverse`. - * - * **Note:** This method mutates the wrapped array. - * - * @name reverse - * @memberOf _ - * @category Seq - * @returns {Object} Returns the new `lodash` wrapper instance. - * @example - * - * var array = [1, 2, 3]; - * - * _(array).reverse().value() - * // => [3, 2, 1] - * - * console.log(array); - * // => [3, 2, 1] - */ - function wrapperReverse() { - var value = this.__wrapped__; - if (value instanceof LazyWrapper) { - var wrapped = value; - if (this.__actions__.length) { - wrapped = new LazyWrapper(this); - } - wrapped = wrapped.reverse(); - wrapped.__actions__.push({ - 'func': thru, - 'args': [reverse], - 'thisArg': undefined - }); - return new LodashWrapper(wrapped, this.__chain__); - } - return this.thru(reverse); - } - - /** - * Executes the chained sequence to extract the unwrapped value. - * - * @name value - * @memberOf _ - * @alias toJSON, valueOf - * @category Seq - * @returns {*} Returns the resolved unwrapped value. - * @example - * - * _([1, 2, 3]).value(); - * // => [1, 2, 3] - */ - function wrapperValue() { - return baseWrapperValue(this.__wrapped__, this.__actions__); - } - - /*------------------------------------------------------------------------*/ - - /** - * Creates an object composed of keys generated from the results of running - * each element of `collection` through `iteratee`. The corresponding value - * of each key is the number of times the key was returned by `iteratee`. - * The iteratee is invoked with one argument: (value). - * - * @static - * @memberOf _ - * @category Collection - * @param {Array|Object} collection The collection to iterate over. - * @param {Function|Object|string} [iteratee=_.identity] The iteratee to transform keys. - * @returns {Object} Returns the composed aggregate object. - * @example - * - * _.countBy([6.1, 4.2, 6.3], Math.floor); - * // => { '4': 1, '6': 2 } - * - * _.countBy(['one', 'two', 'three'], 'length'); - * // => { '3': 2, '5': 1 } - */ - var countBy = createAggregator(function(result, value, key) { - hasOwnProperty.call(result, key) ? ++result[key] : (result[key] = 1); - }); - - /** - * Checks if `predicate` returns truthy for **all** elements of `collection`. - * Iteration is stopped once `predicate` returns falsey. The predicate is - * invoked with three arguments: (value, index|key, collection). - * - * @static - * @memberOf _ - * @category Collection - * @param {Array|Object} collection The collection to iterate over. - * @param {Function|Object|string} [predicate=_.identity] The function invoked per iteration. - * @param- {Object} [guard] Enables use as an iteratee for functions like `_.map`. - * @returns {boolean} Returns `true` if all elements pass the predicate check, else `false`. - * @example - * - * _.every([true, 1, null, 'yes'], Boolean); - * // => false - * - * var users = [ - * { 'user': 'barney', 'active': false }, - * { 'user': 'fred', 'active': false } - * ]; - * - * // The `_.matches` iteratee shorthand. - * _.every(users, { 'user': 'barney', 'active': false }); - * // => false - * - * // The `_.matchesProperty` iteratee shorthand. - * _.every(users, ['active', false]); - * // => true - * - * // The `_.property` iteratee shorthand. - * _.every(users, 'active'); - * // => false - */ - function every(collection, predicate, guard) { - var func = isArray(collection) ? arrayEvery : baseEvery; - if (guard && isIterateeCall(collection, predicate, guard)) { - predicate = undefined; - } - return func(collection, getIteratee(predicate, 3)); - } - - /** - * Iterates over elements of `collection`, returning an array of all elements - * `predicate` returns truthy for. The predicate is invoked with three arguments: - * (value, index|key, collection). - * - * @static - * @memberOf _ - * @category Collection - * @param {Array|Object} collection The collection to iterate over. - * @param {Function|Object|string} [predicate=_.identity] The function invoked per iteration. - * @returns {Array} Returns the new filtered array. - * @example - * - * var users = [ - * { 'user': 'barney', 'age': 36, 'active': true }, - * { 'user': 'fred', 'age': 40, 'active': false } - * ]; - * - * _.filter(users, function(o) { return !o.active; }); - * // => objects for ['fred'] - * - * // The `_.matches` iteratee shorthand. - * _.filter(users, { 'age': 36, 'active': true }); - * // => objects for ['barney'] - * - * // The `_.matchesProperty` iteratee shorthand. - * _.filter(users, ['active', false]); - * // => objects for ['fred'] - * - * // The `_.property` iteratee shorthand. - * _.filter(users, 'active'); - * // => objects for ['barney'] - */ - function filter(collection, predicate) { - var func = isArray(collection) ? arrayFilter : baseFilter; - return func(collection, getIteratee(predicate, 3)); - } - - /** - * Iterates over elements of `collection`, returning the first element - * `predicate` returns truthy for. The predicate is invoked with three arguments: - * (value, index|key, collection). - * - * @static - * @memberOf _ - * @category Collection - * @param {Array|Object} collection The collection to search. - * @param {Function|Object|string} [predicate=_.identity] The function invoked per iteration. - * @returns {*} Returns the matched element, else `undefined`. - * @example - * - * var users = [ - * { 'user': 'barney', 'age': 36, 'active': true }, - * { 'user': 'fred', 'age': 40, 'active': false }, - * { 'user': 'pebbles', 'age': 1, 'active': true } - * ]; - * - * _.find(users, function(o) { return o.age < 40; }); - * // => object for 'barney' - * - * // The `_.matches` iteratee shorthand. - * _.find(users, { 'age': 1, 'active': true }); - * // => object for 'pebbles' - * - * // The `_.matchesProperty` iteratee shorthand. - * _.find(users, ['active', false]); - * // => object for 'fred' - * - * // The `_.property` iteratee shorthand. - * _.find(users, 'active'); - * // => object for 'barney' - */ - function find(collection, predicate) { - predicate = getIteratee(predicate, 3); - if (isArray(collection)) { - var index = baseFindIndex(collection, predicate); - return index > -1 ? collection[index] : undefined; - } - return baseFind(collection, predicate, baseEach); - } - - /** - * This method is like `_.find` except that it iterates over elements of - * `collection` from right to left. - * - * @static - * @memberOf _ - * @category Collection - * @param {Array|Object} collection The collection to search. - * @param {Function|Object|string} [predicate=_.identity] The function invoked per iteration. - * @returns {*} Returns the matched element, else `undefined`. - * @example - * - * _.findLast([1, 2, 3, 4], function(n) { - * return n % 2 == 1; - * }); - * // => 3 - */ - function findLast(collection, predicate) { - predicate = getIteratee(predicate, 3); - if (isArray(collection)) { - var index = baseFindIndex(collection, predicate, true); - return index > -1 ? collection[index] : undefined; - } - return baseFind(collection, predicate, baseEachRight); - } - - /** - * Creates an array of flattened values by running each element in `collection` - * through `iteratee` and concating its result to the other mapped values. - * The iteratee is invoked with three arguments: (value, index|key, collection). - * - * @static - * @memberOf _ - * @category Collection - * @param {Array|Object} collection The collection to iterate over. - * @param {Function|Object|string} [iteratee=_.identity] The function invoked per iteration. - * @returns {Array} Returns the new flattened array. - * @example - * - * function duplicate(n) { - * return [n, n]; - * } - * - * _.flatMap([1, 2], duplicate); - * // => [1, 1, 2, 2] - */ - function flatMap(collection, iteratee) { - return baseFlatten(map(collection, iteratee), 1); - } - - /** - * Iterates over elements of `collection` invoking `iteratee` for each element. - * The iteratee is invoked with three arguments: (value, index|key, collection). - * Iteratee functions may exit iteration early by explicitly returning `false`. - * - * **Note:** As with other "Collections" methods, objects with a "length" property - * are iterated like arrays. To avoid this behavior use `_.forIn` or `_.forOwn` - * for object iteration. - * - * @static - * @memberOf _ - * @alias each - * @category Collection - * @param {Array|Object} collection The collection to iterate over. - * @param {Function} [iteratee=_.identity] The function invoked per iteration. - * @returns {Array|Object} Returns `collection`. - * @example - * - * _([1, 2]).forEach(function(value) { - * console.log(value); - * }); - * // => logs `1` then `2` - * - * _.forEach({ 'a': 1, 'b': 2 }, function(value, key) { - * console.log(key); - * }); - * // => logs 'a' then 'b' (iteration order is not guaranteed) - */ - function forEach(collection, iteratee) { - return (typeof iteratee == 'function' && isArray(collection)) - ? arrayEach(collection, iteratee) - : baseEach(collection, baseCastFunction(iteratee)); - } - - /** - * This method is like `_.forEach` except that it iterates over elements of - * `collection` from right to left. - * - * @static - * @memberOf _ - * @alias eachRight - * @category Collection - * @param {Array|Object} collection The collection to iterate over. - * @param {Function} [iteratee=_.identity] The function invoked per iteration. - * @returns {Array|Object} Returns `collection`. - * @example - * - * _.forEachRight([1, 2], function(value) { - * console.log(value); - * }); - * // => logs `2` then `1` - */ - function forEachRight(collection, iteratee) { - return (typeof iteratee == 'function' && isArray(collection)) - ? arrayEachRight(collection, iteratee) - : baseEachRight(collection, baseCastFunction(iteratee)); - } - - /** - * Creates an object composed of keys generated from the results of running - * each element of `collection` through `iteratee`. The corresponding value - * of each key is an array of elements responsible for generating the key. - * The iteratee is invoked with one argument: (value). - * - * @static - * @memberOf _ - * @category Collection - * @param {Array|Object} collection The collection to iterate over. - * @param {Function|Object|string} [iteratee=_.identity] The iteratee to transform keys. - * @returns {Object} Returns the composed aggregate object. - * @example - * - * _.groupBy([6.1, 4.2, 6.3], Math.floor); - * // => { '4': [4.2], '6': [6.1, 6.3] } - * - * // The `_.property` iteratee shorthand. - * _.groupBy(['one', 'two', 'three'], 'length'); - * // => { '3': ['one', 'two'], '5': ['three'] } - */ - var groupBy = createAggregator(function(result, value, key) { - if (hasOwnProperty.call(result, key)) { - result[key].push(value); - } else { - result[key] = [value]; - } - }); - - /** - * Checks if `value` is in `collection`. If `collection` is a string it's checked - * for a substring of `value`, otherwise [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero) - * is used for equality comparisons. If `fromIndex` is negative, it's used as - * the offset from the end of `collection`. - * - * @static - * @memberOf _ - * @category Collection - * @param {Array|Object|string} collection The collection to search. - * @param {*} value The value to search for. - * @param {number} [fromIndex=0] The index to search from. - * @param- {Object} [guard] Enables use as an iteratee for functions like `_.reduce`. - * @returns {boolean} Returns `true` if `value` is found, else `false`. - * @example - * - * _.includes([1, 2, 3], 1); - * // => true - * - * _.includes([1, 2, 3], 1, 2); - * // => false - * - * _.includes({ 'user': 'fred', 'age': 40 }, 'fred'); - * // => true - * - * _.includes('pebbles', 'eb'); - * // => true - */ - function includes(collection, value, fromIndex, guard) { - collection = isArrayLike(collection) ? collection : values(collection); - fromIndex = (fromIndex && !guard) ? toInteger(fromIndex) : 0; - - var length = collection.length; - if (fromIndex < 0) { - fromIndex = nativeMax(length + fromIndex, 0); - } - return isString(collection) - ? (fromIndex <= length && collection.indexOf(value, fromIndex) > -1) - : (!!length && baseIndexOf(collection, value, fromIndex) > -1); - } - - /** - * Invokes the method at `path` of each element in `collection`, returning - * an array of the results of each invoked method. Any additional arguments - * are provided to each invoked method. If `methodName` is a function it's - * invoked for, and `this` bound to, each element in `collection`. - * - * @static - * @memberOf _ - * @category Collection - * @param {Array|Object} collection The collection to iterate over. - * @param {Array|Function|string} path The path of the method to invoke or - * the function invoked per iteration. - * @param {...*} [args] The arguments to invoke each method with. - * @returns {Array} Returns the array of results. - * @example - * - * _.invokeMap([[5, 1, 7], [3, 2, 1]], 'sort'); - * // => [[1, 5, 7], [1, 2, 3]] - * - * _.invokeMap([123, 456], String.prototype.split, ''); - * // => [['1', '2', '3'], ['4', '5', '6']] - */ - var invokeMap = rest(function(collection, path, args) { - var index = -1, - isFunc = typeof path == 'function', - isProp = isKey(path), - result = isArrayLike(collection) ? Array(collection.length) : []; - - baseEach(collection, function(value) { - var func = isFunc ? path : ((isProp && value != null) ? value[path] : undefined); - result[++index] = func ? apply(func, value, args) : baseInvoke(value, path, args); - }); - return result; - }); - - /** - * Creates an object composed of keys generated from the results of running - * each element of `collection` through `iteratee`. The corresponding value - * of each key is the last element responsible for generating the key. The - * iteratee is invoked with one argument: (value). - * - * @static - * @memberOf _ - * @category Collection - * @param {Array|Object} collection The collection to iterate over. - * @param {Function|Object|string} [iteratee=_.identity] The iteratee to transform keys. - * @returns {Object} Returns the composed aggregate object. - * @example - * - * var array = [ - * { 'dir': 'left', 'code': 97 }, - * { 'dir': 'right', 'code': 100 } - * ]; - * - * _.keyBy(array, function(o) { - * return String.fromCharCode(o.code); - * }); - * // => { 'a': { 'dir': 'left', 'code': 97 }, 'd': { 'dir': 'right', 'code': 100 } } - * - * _.keyBy(array, 'dir'); - * // => { 'left': { 'dir': 'left', 'code': 97 }, 'right': { 'dir': 'right', 'code': 100 } } - */ - var keyBy = createAggregator(function(result, value, key) { - result[key] = value; - }); - - /** - * Creates an array of values by running each element in `collection` through - * `iteratee`. The iteratee is invoked with three arguments: - * (value, index|key, collection). - * - * Many lodash methods are guarded to work as iteratees for methods like - * `_.every`, `_.filter`, `_.map`, `_.mapValues`, `_.reject`, and `_.some`. - * - * The guarded methods are: - * `ary`, `curry`, `curryRight`, `drop`, `dropRight`, `every`, `fill`, - * `invert`, `parseInt`, `random`, `range`, `rangeRight`, `slice`, `some`, - * `sortBy`, `take`, `takeRight`, `template`, `trim`, `trimEnd`, `trimStart`, - * and `words` - * - * @static - * @memberOf _ - * @category Collection - * @param {Array|Object} collection The collection to iterate over. - * @param {Function|Object|string} [iteratee=_.identity] The function invoked per iteration. - * @returns {Array} Returns the new mapped array. - * @example - * - * function square(n) { - * return n * n; - * } - * - * _.map([4, 8], square); - * // => [16, 64] - * - * _.map({ 'a': 4, 'b': 8 }, square); - * // => [16, 64] (iteration order is not guaranteed) - * - * var users = [ - * { 'user': 'barney' }, - * { 'user': 'fred' } - * ]; - * - * // The `_.property` iteratee shorthand. - * _.map(users, 'user'); - * // => ['barney', 'fred'] - */ - function map(collection, iteratee) { - var func = isArray(collection) ? arrayMap : baseMap; - return func(collection, getIteratee(iteratee, 3)); - } - - /** - * This method is like `_.sortBy` except that it allows specifying the sort - * orders of the iteratees to sort by. If `orders` is unspecified, all values - * are sorted in ascending order. Otherwise, specify an order of "desc" for - * descending or "asc" for ascending sort order of corresponding values. - * - * @static - * @memberOf _ - * @category Collection - * @param {Array|Object} collection The collection to iterate over. - * @param {Function[]|Object[]|string[]} [iteratees=[_.identity]] The iteratees to sort by. - * @param {string[]} [orders] The sort orders of `iteratees`. - * @param- {Object} [guard] Enables use as an iteratee for functions like `_.reduce`. - * @returns {Array} Returns the new sorted array. - * @example - * - * var users = [ - * { 'user': 'fred', 'age': 48 }, - * { 'user': 'barney', 'age': 34 }, - * { 'user': 'fred', 'age': 42 }, - * { 'user': 'barney', 'age': 36 } - * ]; - * - * // Sort by `user` in ascending order and by `age` in descending order. - * _.orderBy(users, ['user', 'age'], ['asc', 'desc']); - * // => objects for [['barney', 36], ['barney', 34], ['fred', 48], ['fred', 42]] - */ - function orderBy(collection, iteratees, orders, guard) { - if (collection == null) { - return []; - } - if (!isArray(iteratees)) { - iteratees = iteratees == null ? [] : [iteratees]; - } - orders = guard ? undefined : orders; - if (!isArray(orders)) { - orders = orders == null ? [] : [orders]; - } - return baseOrderBy(collection, iteratees, orders); - } - - /** - * Creates an array of elements split into two groups, the first of which - * contains elements `predicate` returns truthy for, the second of which - * contains elements `predicate` returns falsey for. The predicate is - * invoked with one argument: (value). - * - * @static - * @memberOf _ - * @category Collection - * @param {Array|Object} collection The collection to iterate over. - * @param {Function|Object|string} [predicate=_.identity] The function invoked per iteration. - * @returns {Array} Returns the array of grouped elements. - * @example - * - * var users = [ - * { 'user': 'barney', 'age': 36, 'active': false }, - * { 'user': 'fred', 'age': 40, 'active': true }, - * { 'user': 'pebbles', 'age': 1, 'active': false } - * ]; - * - * _.partition(users, function(o) { return o.active; }); - * // => objects for [['fred'], ['barney', 'pebbles']] - * - * // The `_.matches` iteratee shorthand. - * _.partition(users, { 'age': 1, 'active': false }); - * // => objects for [['pebbles'], ['barney', 'fred']] - * - * // The `_.matchesProperty` iteratee shorthand. - * _.partition(users, ['active', false]); - * // => objects for [['barney', 'pebbles'], ['fred']] - * - * // The `_.property` iteratee shorthand. - * _.partition(users, 'active'); - * // => objects for [['fred'], ['barney', 'pebbles']] - */ - var partition = createAggregator(function(result, value, key) { - result[key ? 0 : 1].push(value); - }, function() { return [[], []]; }); - - /** - * Reduces `collection` to a value which is the accumulated result of running - * each element in `collection` through `iteratee`, where each successive - * invocation is supplied the return value of the previous. If `accumulator` - * is not given the first element of `collection` is used as the initial - * value. The iteratee is invoked with four arguments: - * (accumulator, value, index|key, collection). - * - * Many lodash methods are guarded to work as iteratees for methods like - * `_.reduce`, `_.reduceRight`, and `_.transform`. - * - * The guarded methods are: - * `assign`, `defaults`, `defaultsDeep`, `includes`, `merge`, `orderBy`, - * and `sortBy` - * - * @static - * @memberOf _ - * @category Collection - * @param {Array|Object} collection The collection to iterate over. - * @param {Function} [iteratee=_.identity] The function invoked per iteration. - * @param {*} [accumulator] The initial value. - * @returns {*} Returns the accumulated value. - * @example - * - * _.reduce([1, 2], function(sum, n) { - * return sum + n; - * }, 0); - * // => 3 - * - * _.reduce({ 'a': 1, 'b': 2, 'c': 1 }, function(result, value, key) { - * (result[value] || (result[value] = [])).push(key); - * return result; - * }, {}); - * // => { '1': ['a', 'c'], '2': ['b'] } (iteration order is not guaranteed) - */ - function reduce(collection, iteratee, accumulator) { - var func = isArray(collection) ? arrayReduce : baseReduce, - initAccum = arguments.length < 3; - - return func(collection, getIteratee(iteratee, 4), accumulator, initAccum, baseEach); - } - - /** - * This method is like `_.reduce` except that it iterates over elements of - * `collection` from right to left. - * - * @static - * @memberOf _ - * @category Collection - * @param {Array|Object} collection The collection to iterate over. - * @param {Function} [iteratee=_.identity] The function invoked per iteration. - * @param {*} [accumulator] The initial value. - * @returns {*} Returns the accumulated value. - * @example - * - * var array = [[0, 1], [2, 3], [4, 5]]; - * - * _.reduceRight(array, function(flattened, other) { - * return flattened.concat(other); - * }, []); - * // => [4, 5, 2, 3, 0, 1] - */ - function reduceRight(collection, iteratee, accumulator) { - var func = isArray(collection) ? arrayReduceRight : baseReduce, - initAccum = arguments.length < 3; - - return func(collection, getIteratee(iteratee, 4), accumulator, initAccum, baseEachRight); - } - - /** - * The opposite of `_.filter`; this method returns the elements of `collection` - * that `predicate` does **not** return truthy for. - * - * @static - * @memberOf _ - * @category Collection - * @param {Array|Object} collection The collection to iterate over. - * @param {Function|Object|string} [predicate=_.identity] The function invoked per iteration. - * @returns {Array} Returns the new filtered array. - * @example - * - * var users = [ - * { 'user': 'barney', 'age': 36, 'active': false }, - * { 'user': 'fred', 'age': 40, 'active': true } - * ]; - * - * _.reject(users, function(o) { return !o.active; }); - * // => objects for ['fred'] - * - * // The `_.matches` iteratee shorthand. - * _.reject(users, { 'age': 40, 'active': true }); - * // => objects for ['barney'] - * - * // The `_.matchesProperty` iteratee shorthand. - * _.reject(users, ['active', false]); - * // => objects for ['fred'] - * - * // The `_.property` iteratee shorthand. - * _.reject(users, 'active'); - * // => objects for ['barney'] - */ - function reject(collection, predicate) { - var func = isArray(collection) ? arrayFilter : baseFilter; - predicate = getIteratee(predicate, 3); - return func(collection, function(value, index, collection) { - return !predicate(value, index, collection); - }); - } - - /** - * Gets a random element from `collection`. - * - * @static - * @memberOf _ - * @category Collection - * @param {Array|Object} collection The collection to sample. - * @returns {*} Returns the random element. - * @example - * - * _.sample([1, 2, 3, 4]); - * // => 2 - */ - function sample(collection) { - var array = isArrayLike(collection) ? collection : values(collection), - length = array.length; - - return length > 0 ? array[baseRandom(0, length - 1)] : undefined; - } - - /** - * Gets `n` random elements at unique keys from `collection` up to the - * size of `collection`. - * - * @static - * @memberOf _ - * @category Collection - * @param {Array|Object} collection The collection to sample. - * @param {number} [n=0] The number of elements to sample. - * @returns {Array} Returns the random elements. - * @example - * - * _.sampleSize([1, 2, 3], 2); - * // => [3, 1] - * - * _.sampleSize([1, 2, 3], 4); - * // => [2, 3, 1] - */ - function sampleSize(collection, n) { - var index = -1, - result = toArray(collection), - length = result.length, - lastIndex = length - 1; - - n = baseClamp(toInteger(n), 0, length); - while (++index < n) { - var rand = baseRandom(index, lastIndex), - value = result[rand]; - - result[rand] = result[index]; - result[index] = value; - } - result.length = n; - return result; - } - - /** - * Creates an array of shuffled values, using a version of the - * [Fisher-Yates shuffle](https://en.wikipedia.org/wiki/Fisher-Yates_shuffle). - * - * @static - * @memberOf _ - * @category Collection - * @param {Array|Object} collection The collection to shuffle. - * @returns {Array} Returns the new shuffled array. - * @example - * - * _.shuffle([1, 2, 3, 4]); - * // => [4, 1, 3, 2] - */ - function shuffle(collection) { - return sampleSize(collection, MAX_ARRAY_LENGTH); - } - - /** - * Gets the size of `collection` by returning its length for array-like - * values or the number of own enumerable properties for objects. - * - * @static - * @memberOf _ - * @category Collection - * @param {Array|Object} collection The collection to inspect. - * @returns {number} Returns the collection size. - * @example - * - * _.size([1, 2, 3]); - * // => 3 - * - * _.size({ 'a': 1, 'b': 2 }); - * // => 2 - * - * _.size('pebbles'); - * // => 7 - */ - function size(collection) { - if (collection == null) { - return 0; - } - if (isArrayLike(collection)) { - var result = collection.length; - return (result && isString(collection)) ? stringSize(collection) : result; - } - return keys(collection).length; - } - - /** - * Checks if `predicate` returns truthy for **any** element of `collection`. - * Iteration is stopped once `predicate` returns truthy. The predicate is - * invoked with three arguments: (value, index|key, collection). - * - * @static - * @memberOf _ - * @category Collection - * @param {Array|Object} collection The collection to iterate over. - * @param {Function|Object|string} [predicate=_.identity] The function invoked per iteration. - * @param- {Object} [guard] Enables use as an iteratee for functions like `_.map`. - * @returns {boolean} Returns `true` if any element passes the predicate check, else `false`. - * @example - * - * _.some([null, 0, 'yes', false], Boolean); - * // => true - * - * var users = [ - * { 'user': 'barney', 'active': true }, - * { 'user': 'fred', 'active': false } - * ]; - * - * // The `_.matches` iteratee shorthand. - * _.some(users, { 'user': 'barney', 'active': false }); - * // => false - * - * // The `_.matchesProperty` iteratee shorthand. - * _.some(users, ['active', false]); - * // => true - * - * // The `_.property` iteratee shorthand. - * _.some(users, 'active'); - * // => true - */ - function some(collection, predicate, guard) { - var func = isArray(collection) ? arraySome : baseSome; - if (guard && isIterateeCall(collection, predicate, guard)) { - predicate = undefined; - } - return func(collection, getIteratee(predicate, 3)); - } - - /** - * Creates an array of elements, sorted in ascending order by the results of - * running each element in a collection through each iteratee. This method - * performs a stable sort, that is, it preserves the original sort order of - * equal elements. The iteratees are invoked with one argument: (value). - * - * @static - * @memberOf _ - * @category Collection - * @param {Array|Object} collection The collection to iterate over. - * @param {...(Function|Function[]|Object|Object[]|string|string[])} [iteratees=[_.identity]] - * The iteratees to sort by, specified individually or in arrays. - * @returns {Array} Returns the new sorted array. - * @example - * - * var users = [ - * { 'user': 'fred', 'age': 48 }, - * { 'user': 'barney', 'age': 36 }, - * { 'user': 'fred', 'age': 42 }, - * { 'user': 'barney', 'age': 34 } - * ]; - * - * _.sortBy(users, function(o) { return o.user; }); - * // => objects for [['barney', 36], ['barney', 34], ['fred', 48], ['fred', 42]] - * - * _.sortBy(users, ['user', 'age']); - * // => objects for [['barney', 34], ['barney', 36], ['fred', 42], ['fred', 48]] - * - * _.sortBy(users, 'user', function(o) { - * return Math.floor(o.age / 10); - * }); - * // => objects for [['barney', 36], ['barney', 34], ['fred', 48], ['fred', 42]] - */ - var sortBy = rest(function(collection, iteratees) { - if (collection == null) { - return []; - } - var length = iteratees.length; - if (length > 1 && isIterateeCall(collection, iteratees[0], iteratees[1])) { - iteratees = []; - } else if (length > 2 && isIterateeCall(iteratees[0], iteratees[1], iteratees[2])) { - iteratees.length = 1; - } - return baseOrderBy(collection, baseFlatten(iteratees, 1), []); - }); - - /*------------------------------------------------------------------------*/ - - /** - * Gets the timestamp of the number of milliseconds that have elapsed since - * the Unix epoch (1 January 1970 00:00:00 UTC). - * - * @static - * @memberOf _ - * @type {Function} - * @category Date - * @returns {number} Returns the timestamp. - * @example - * - * _.defer(function(stamp) { - * console.log(_.now() - stamp); - * }, _.now()); - * // => logs the number of milliseconds it took for the deferred function to be invoked - */ - var now = Date.now; - - /*------------------------------------------------------------------------*/ - - /** - * The opposite of `_.before`; this method creates a function that invokes - * `func` once it's called `n` or more times. - * - * @static - * @memberOf _ - * @category Function - * @param {number} n The number of calls before `func` is invoked. - * @param {Function} func The function to restrict. - * @returns {Function} Returns the new restricted function. - * @example - * - * var saves = ['profile', 'settings']; - * - * var done = _.after(saves.length, function() { - * console.log('done saving!'); - * }); - * - * _.forEach(saves, function(type) { - * asyncSave({ 'type': type, 'complete': done }); - * }); - * // => logs 'done saving!' after the two async saves have completed - */ - function after(n, func) { - if (typeof func != 'function') { - throw new TypeError(FUNC_ERROR_TEXT); - } - n = toInteger(n); - return function() { - if (--n < 1) { - return func.apply(this, arguments); - } - }; - } - - /** - * Creates a function that accepts up to `n` arguments, ignoring any - * additional arguments. - * - * @static - * @memberOf _ - * @category Function - * @param {Function} func The function to cap arguments for. - * @param {number} [n=func.length] The arity cap. - * @param- {Object} [guard] Enables use as an iteratee for functions like `_.map`. - * @returns {Function} Returns the new function. - * @example - * - * _.map(['6', '8', '10'], _.ary(parseInt, 1)); - * // => [6, 8, 10] - */ - function ary(func, n, guard) { - n = guard ? undefined : n; - n = (func && n == null) ? func.length : n; - return createWrapper(func, ARY_FLAG, undefined, undefined, undefined, undefined, n); - } - - /** - * Creates a function that invokes `func`, with the `this` binding and arguments - * of the created function, while it's called less than `n` times. Subsequent - * calls to the created function return the result of the last `func` invocation. - * - * @static - * @memberOf _ - * @category Function - * @param {number} n The number of calls at which `func` is no longer invoked. - * @param {Function} func The function to restrict. - * @returns {Function} Returns the new restricted function. - * @example - * - * jQuery(element).on('click', _.before(5, addContactToList)); - * // => allows adding up to 4 contacts to the list - */ - function before(n, func) { - var result; - if (typeof func != 'function') { - throw new TypeError(FUNC_ERROR_TEXT); - } - n = toInteger(n); - return function() { - if (--n > 0) { - result = func.apply(this, arguments); - } - if (n <= 1) { - func = undefined; - } - return result; - }; - } - - /** - * Creates a function that invokes `func` with the `this` binding of `thisArg` - * and prepends any additional `_.bind` arguments to those provided to the - * bound function. - * - * The `_.bind.placeholder` value, which defaults to `_` in monolithic builds, - * may be used as a placeholder for partially applied arguments. - * - * **Note:** Unlike native `Function#bind` this method doesn't set the "length" - * property of bound functions. - * - * @static - * @memberOf _ - * @category Function - * @param {Function} func The function to bind. - * @param {*} thisArg The `this` binding of `func`. - * @param {...*} [partials] The arguments to be partially applied. - * @returns {Function} Returns the new bound function. - * @example - * - * var greet = function(greeting, punctuation) { - * return greeting + ' ' + this.user + punctuation; - * }; - * - * var object = { 'user': 'fred' }; - * - * var bound = _.bind(greet, object, 'hi'); - * bound('!'); - * // => 'hi fred!' - * - * // Bound with placeholders. - * var bound = _.bind(greet, object, _, '!'); - * bound('hi'); - * // => 'hi fred!' - */ - var bind = rest(function(func, thisArg, partials) { - var bitmask = BIND_FLAG; - if (partials.length) { - var holders = replaceHolders(partials, getPlaceholder(bind)); - bitmask |= PARTIAL_FLAG; - } - return createWrapper(func, bitmask, thisArg, partials, holders); - }); - - /** - * Creates a function that invokes the method at `object[key]` and prepends - * any additional `_.bindKey` arguments to those provided to the bound function. - * - * This method differs from `_.bind` by allowing bound functions to reference - * methods that may be redefined or don't yet exist. - * See [Peter Michaux's article](http://peter.michaux.ca/articles/lazy-function-definition-pattern) - * for more details. - * - * The `_.bindKey.placeholder` value, which defaults to `_` in monolithic - * builds, may be used as a placeholder for partially applied arguments. - * - * @static - * @memberOf _ - * @category Function - * @param {Object} object The object to invoke the method on. - * @param {string} key The key of the method. - * @param {...*} [partials] The arguments to be partially applied. - * @returns {Function} Returns the new bound function. - * @example - * - * var object = { - * 'user': 'fred', - * 'greet': function(greeting, punctuation) { - * return greeting + ' ' + this.user + punctuation; - * } - * }; - * - * var bound = _.bindKey(object, 'greet', 'hi'); - * bound('!'); - * // => 'hi fred!' - * - * object.greet = function(greeting, punctuation) { - * return greeting + 'ya ' + this.user + punctuation; - * }; - * - * bound('!'); - * // => 'hiya fred!' - * - * // Bound with placeholders. - * var bound = _.bindKey(object, 'greet', _, '!'); - * bound('hi'); - * // => 'hiya fred!' - */ - var bindKey = rest(function(object, key, partials) { - var bitmask = BIND_FLAG | BIND_KEY_FLAG; - if (partials.length) { - var holders = replaceHolders(partials, getPlaceholder(bindKey)); - bitmask |= PARTIAL_FLAG; - } - return createWrapper(key, bitmask, object, partials, holders); - }); - - /** - * Creates a function that accepts arguments of `func` and either invokes - * `func` returning its result, if at least `arity` number of arguments have - * been provided, or returns a function that accepts the remaining `func` - * arguments, and so on. The arity of `func` may be specified if `func.length` - * is not sufficient. - * - * The `_.curry.placeholder` value, which defaults to `_` in monolithic builds, - * may be used as a placeholder for provided arguments. - * - * **Note:** This method doesn't set the "length" property of curried functions. - * - * @static - * @memberOf _ - * @category Function - * @param {Function} func The function to curry. - * @param {number} [arity=func.length] The arity of `func`. - * @param- {Object} [guard] Enables use as an iteratee for functions like `_.map`. - * @returns {Function} Returns the new curried function. - * @example - * - * var abc = function(a, b, c) { - * return [a, b, c]; - * }; - * - * var curried = _.curry(abc); - * - * curried(1)(2)(3); - * // => [1, 2, 3] - * - * curried(1, 2)(3); - * // => [1, 2, 3] - * - * curried(1, 2, 3); - * // => [1, 2, 3] - * - * // Curried with placeholders. - * curried(1)(_, 3)(2); - * // => [1, 2, 3] - */ - function curry(func, arity, guard) { - arity = guard ? undefined : arity; - var result = createWrapper(func, CURRY_FLAG, undefined, undefined, undefined, undefined, undefined, arity); - result.placeholder = curry.placeholder; - return result; - } - - /** - * This method is like `_.curry` except that arguments are applied to `func` - * in the manner of `_.partialRight` instead of `_.partial`. - * - * The `_.curryRight.placeholder` value, which defaults to `_` in monolithic - * builds, may be used as a placeholder for provided arguments. - * - * **Note:** This method doesn't set the "length" property of curried functions. - * - * @static - * @memberOf _ - * @category Function - * @param {Function} func The function to curry. - * @param {number} [arity=func.length] The arity of `func`. - * @param- {Object} [guard] Enables use as an iteratee for functions like `_.map`. - * @returns {Function} Returns the new curried function. - * @example - * - * var abc = function(a, b, c) { - * return [a, b, c]; - * }; - * - * var curried = _.curryRight(abc); - * - * curried(3)(2)(1); - * // => [1, 2, 3] - * - * curried(2, 3)(1); - * // => [1, 2, 3] - * - * curried(1, 2, 3); - * // => [1, 2, 3] - * - * // Curried with placeholders. - * curried(3)(1, _)(2); - * // => [1, 2, 3] - */ - function curryRight(func, arity, guard) { - arity = guard ? undefined : arity; - var result = createWrapper(func, CURRY_RIGHT_FLAG, undefined, undefined, undefined, undefined, undefined, arity); - result.placeholder = curryRight.placeholder; - return result; - } - - /** - * Creates a debounced function that delays invoking `func` until after `wait` - * milliseconds have elapsed since the last time the debounced function was - * invoked. The debounced function comes with a `cancel` method to cancel - * delayed `func` invocations and a `flush` method to immediately invoke them. - * Provide an options object to indicate whether `func` should be invoked on - * the leading and/or trailing edge of the `wait` timeout. The `func` is invoked - * with the last arguments provided to the debounced function. Subsequent calls - * to the debounced function return the result of the last `func` invocation. - * - * **Note:** If `leading` and `trailing` options are `true`, `func` is invoked - * on the trailing edge of the timeout only if the debounced function is - * invoked more than once during the `wait` timeout. - * - * See [David Corbacho's article](http://drupalmotion.com/article/debounce-and-throttle-visual-explanation) - * for details over the differences between `_.debounce` and `_.throttle`. - * - * @static - * @memberOf _ - * @category Function - * @param {Function} func The function to debounce. - * @param {number} [wait=0] The number of milliseconds to delay. - * @param {Object} [options] The options object. - * @param {boolean} [options.leading=false] Specify invoking on the leading - * edge of the timeout. - * @param {number} [options.maxWait] The maximum time `func` is allowed to be - * delayed before it's invoked. - * @param {boolean} [options.trailing=true] Specify invoking on the trailing - * edge of the timeout. - * @returns {Function} Returns the new debounced function. - * @example - * - * // Avoid costly calculations while the window size is in flux. - * jQuery(window).on('resize', _.debounce(calculateLayout, 150)); - * - * // Invoke `sendMail` when clicked, debouncing subsequent calls. - * jQuery(element).on('click', _.debounce(sendMail, 300, { - * 'leading': true, - * 'trailing': false - * })); - * - * // Ensure `batchLog` is invoked once after 1 second of debounced calls. - * var debounced = _.debounce(batchLog, 250, { 'maxWait': 1000 }); - * var source = new EventSource('/stream'); - * jQuery(source).on('message', debounced); - * - * // Cancel the trailing debounced invocation. - * jQuery(window).on('popstate', debounced.cancel); - */ - function debounce(func, wait, options) { - var args, - maxTimeoutId, - result, - stamp, - thisArg, - timeoutId, - trailingCall, - lastCalled = 0, - leading = false, - maxWait = false, - trailing = true; - - if (typeof func != 'function') { - throw new TypeError(FUNC_ERROR_TEXT); - } - wait = toNumber(wait) || 0; - if (isObject(options)) { - leading = !!options.leading; - maxWait = 'maxWait' in options && nativeMax(toNumber(options.maxWait) || 0, wait); - trailing = 'trailing' in options ? !!options.trailing : trailing; - } - - function cancel() { - if (timeoutId) { - clearTimeout(timeoutId); - } - if (maxTimeoutId) { - clearTimeout(maxTimeoutId); - } - lastCalled = 0; - args = maxTimeoutId = thisArg = timeoutId = trailingCall = undefined; - } - - function complete(isCalled, id) { - if (id) { - clearTimeout(id); - } - maxTimeoutId = timeoutId = trailingCall = undefined; - if (isCalled) { - lastCalled = now(); - result = func.apply(thisArg, args); - if (!timeoutId && !maxTimeoutId) { - args = thisArg = undefined; - } - } - } - - function delayed() { - var remaining = wait - (now() - stamp); - if (remaining <= 0 || remaining > wait) { - complete(trailingCall, maxTimeoutId); - } else { - timeoutId = setTimeout(delayed, remaining); - } - } - - function flush() { - if ((timeoutId && trailingCall) || (maxTimeoutId && trailing)) { - result = func.apply(thisArg, args); - } - cancel(); - return result; - } - - function maxDelayed() { - complete(trailing, timeoutId); - } - - function debounced() { - args = arguments; - stamp = now(); - thisArg = this; - trailingCall = trailing && (timeoutId || !leading); - - if (maxWait === false) { - var leadingCall = leading && !timeoutId; - } else { - if (!lastCalled && !maxTimeoutId && !leading) { - lastCalled = stamp; - } - var remaining = maxWait - (stamp - lastCalled); - - var isCalled = (remaining <= 0 || remaining > maxWait) && - (leading || maxTimeoutId); - - if (isCalled) { - if (maxTimeoutId) { - maxTimeoutId = clearTimeout(maxTimeoutId); - } - lastCalled = stamp; - result = func.apply(thisArg, args); - } - else if (!maxTimeoutId) { - maxTimeoutId = setTimeout(maxDelayed, remaining); - } - } - if (isCalled && timeoutId) { - timeoutId = clearTimeout(timeoutId); - } - else if (!timeoutId && wait !== maxWait) { - timeoutId = setTimeout(delayed, wait); - } - if (leadingCall) { - isCalled = true; - result = func.apply(thisArg, args); - } - if (isCalled && !timeoutId && !maxTimeoutId) { - args = thisArg = undefined; - } - return result; - } - debounced.cancel = cancel; - debounced.flush = flush; - return debounced; - } - - /** - * Defers invoking the `func` until the current call stack has cleared. Any - * additional arguments are provided to `func` when it's invoked. - * - * @static - * @memberOf _ - * @category Function - * @param {Function} func The function to defer. - * @param {...*} [args] The arguments to invoke `func` with. - * @returns {number} Returns the timer id. - * @example - * - * _.defer(function(text) { - * console.log(text); - * }, 'deferred'); - * // => logs 'deferred' after one or more milliseconds - */ - var defer = rest(function(func, args) { - return baseDelay(func, 1, args); - }); - - /** - * Invokes `func` after `wait` milliseconds. Any additional arguments are - * provided to `func` when it's invoked. - * - * @static - * @memberOf _ - * @category Function - * @param {Function} func The function to delay. - * @param {number} wait The number of milliseconds to delay invocation. - * @param {...*} [args] The arguments to invoke `func` with. - * @returns {number} Returns the timer id. - * @example - * - * _.delay(function(text) { - * console.log(text); - * }, 1000, 'later'); - * // => logs 'later' after one second - */ - var delay = rest(function(func, wait, args) { - return baseDelay(func, toNumber(wait) || 0, args); - }); - - /** - * Creates a function that invokes `func` with arguments reversed. - * - * @static - * @memberOf _ - * @category Function - * @param {Function} func The function to flip arguments for. - * @returns {Function} Returns the new function. - * @example - * - * var flipped = _.flip(function() { - * return _.toArray(arguments); - * }); - * - * flipped('a', 'b', 'c', 'd'); - * // => ['d', 'c', 'b', 'a'] - */ - function flip(func) { - return createWrapper(func, FLIP_FLAG); - } - - /** - * Creates a function that memoizes the result of `func`. If `resolver` is - * provided it determines the cache key for storing the result based on the - * arguments provided to the memoized function. By default, the first argument - * provided to the memoized function is used as the map cache key. The `func` - * is invoked with the `this` binding of the memoized function. - * - * **Note:** The cache is exposed as the `cache` property on the memoized - * function. Its creation may be customized by replacing the `_.memoize.Cache` - * constructor with one whose instances implement the [`Map`](http://ecma-international.org/ecma-262/6.0/#sec-properties-of-the-map-prototype-object) - * method interface of `delete`, `get`, `has`, and `set`. - * - * @static - * @memberOf _ - * @category Function - * @param {Function} func The function to have its output memoized. - * @param {Function} [resolver] The function to resolve the cache key. - * @returns {Function} Returns the new memoizing function. - * @example - * - * var object = { 'a': 1, 'b': 2 }; - * var other = { 'c': 3, 'd': 4 }; - * - * var values = _.memoize(_.values); - * values(object); - * // => [1, 2] - * - * values(other); - * // => [3, 4] - * - * object.a = 2; - * values(object); - * // => [1, 2] - * - * // Modify the result cache. - * values.cache.set(object, ['a', 'b']); - * values(object); - * // => ['a', 'b'] - * - * // Replace `_.memoize.Cache`. - * _.memoize.Cache = WeakMap; - */ - function memoize(func, resolver) { - if (typeof func != 'function' || (resolver && typeof resolver != 'function')) { - throw new TypeError(FUNC_ERROR_TEXT); - } - var memoized = function() { - var args = arguments, - key = resolver ? resolver.apply(this, args) : args[0], - cache = memoized.cache; - - if (cache.has(key)) { - return cache.get(key); - } - var result = func.apply(this, args); - memoized.cache = cache.set(key, result); - return result; - }; - memoized.cache = new memoize.Cache; - return memoized; - } - - /** - * Creates a function that negates the result of the predicate `func`. The - * `func` predicate is invoked with the `this` binding and arguments of the - * created function. - * - * @static - * @memberOf _ - * @category Function - * @param {Function} predicate The predicate to negate. - * @returns {Function} Returns the new function. - * @example - * - * function isEven(n) { - * return n % 2 == 0; - * } - * - * _.filter([1, 2, 3, 4, 5, 6], _.negate(isEven)); - * // => [1, 3, 5] - */ - function negate(predicate) { - if (typeof predicate != 'function') { - throw new TypeError(FUNC_ERROR_TEXT); - } - return function() { - return !predicate.apply(this, arguments); - }; - } - - /** - * Creates a function that is restricted to invoking `func` once. Repeat calls - * to the function return the value of the first invocation. The `func` is - * invoked with the `this` binding and arguments of the created function. - * - * @static - * @memberOf _ - * @category Function - * @param {Function} func The function to restrict. - * @returns {Function} Returns the new restricted function. - * @example - * - * var initialize = _.once(createApplication); - * initialize(); - * initialize(); - * // `initialize` invokes `createApplication` once - */ - function once(func) { - return before(2, func); - } - - /** - * Creates a function that invokes `func` with arguments transformed by - * corresponding `transforms`. - * - * @static - * @memberOf _ - * @category Function - * @param {Function} func The function to wrap. - * @param {...(Function|Function[])} [transforms] The functions to transform - * arguments, specified individually or in arrays. - * @returns {Function} Returns the new function. - * @example - * - * function doubled(n) { - * return n * 2; - * } - * - * function square(n) { - * return n * n; - * } - * - * var func = _.overArgs(function(x, y) { - * return [x, y]; - * }, square, doubled); - * - * func(9, 3); - * // => [81, 6] - * - * func(10, 5); - * // => [100, 10] - */ - var overArgs = rest(function(func, transforms) { - transforms = arrayMap(baseFlatten(transforms, 1), getIteratee()); - - var funcsLength = transforms.length; - return rest(function(args) { - var index = -1, - length = nativeMin(args.length, funcsLength); - - while (++index < length) { - args[index] = transforms[index].call(this, args[index]); - } - return apply(func, this, args); - }); - }); - - /** - * Creates a function that invokes `func` with `partial` arguments prepended - * to those provided to the new function. This method is like `_.bind` except - * it does **not** alter the `this` binding. - * - * The `_.partial.placeholder` value, which defaults to `_` in monolithic - * builds, may be used as a placeholder for partially applied arguments. - * - * **Note:** This method doesn't set the "length" property of partially - * applied functions. - * - * @static - * @memberOf _ - * @category Function - * @param {Function} func The function to partially apply arguments to. - * @param {...*} [partials] The arguments to be partially applied. - * @returns {Function} Returns the new partially applied function. - * @example - * - * var greet = function(greeting, name) { - * return greeting + ' ' + name; - * }; - * - * var sayHelloTo = _.partial(greet, 'hello'); - * sayHelloTo('fred'); - * // => 'hello fred' - * - * // Partially applied with placeholders. - * var greetFred = _.partial(greet, _, 'fred'); - * greetFred('hi'); - * // => 'hi fred' - */ - var partial = rest(function(func, partials) { - var holders = replaceHolders(partials, getPlaceholder(partial)); - return createWrapper(func, PARTIAL_FLAG, undefined, partials, holders); - }); + // ensure `new lodashWrapper` is an instance of `lodash` + lodashWrapper.prototype = lodash.prototype; /** - * This method is like `_.partial` except that partially applied arguments - * are appended to those provided to the new function. - * - * The `_.partialRight.placeholder` value, which defaults to `_` in monolithic - * builds, may be used as a placeholder for partially applied arguments. - * - * **Note:** This method doesn't set the "length" property of partially - * applied functions. + * An object used to flag environments features. * * @static * @memberOf _ - * @category Function - * @param {Function} func The function to partially apply arguments to. - * @param {...*} [partials] The arguments to be partially applied. - * @returns {Function} Returns the new partially applied function. - * @example - * - * var greet = function(greeting, name) { - * return greeting + ' ' + name; - * }; - * - * var greetFred = _.partialRight(greet, 'fred'); - * greetFred('hi'); - * // => 'hi fred' - * - * // Partially applied with placeholders. - * var sayHelloTo = _.partialRight(greet, 'hello', _); - * sayHelloTo('fred'); - * // => 'hello fred' + * @type Object */ - var partialRight = rest(function(func, partials) { - var holders = replaceHolders(partials, getPlaceholder(partialRight)); - return createWrapper(func, PARTIAL_RIGHT_FLAG, undefined, partials, holders); - }); + var support = lodash.support = {}; - /** - * Creates a function that invokes `func` with arguments arranged according - * to the specified indexes where the argument value at the first index is - * provided as the first argument, the argument value at the second index is - * provided as the second argument, and so on. - * - * @static - * @memberOf _ - * @category Function - * @param {Function} func The function to rearrange arguments for. - * @param {...(number|number[])} indexes The arranged argument indexes, - * specified individually or in arrays. - * @returns {Function} Returns the new function. - * @example - * - * var rearged = _.rearg(function(a, b, c) { - * return [a, b, c]; - * }, 2, 0, 1); - * - * rearged('b', 'c', 'a') - * // => ['a', 'b', 'c'] - */ - var rearg = rest(function(func, indexes) { - return createWrapper(func, REARG_FLAG, undefined, undefined, undefined, baseFlatten(indexes, 1)); - }); + (function() { + var ctor = function() { this.x = 1; }, + object = { '0': 1, 'length': 1 }, + props = []; - /** - * Creates a function that invokes `func` with the `this` binding of the - * created function and arguments from `start` and beyond provided as an array. - * - * **Note:** This method is based on the [rest parameter](https://mdn.io/rest_parameters). - * - * @static - * @memberOf _ - * @category Function - * @param {Function} func The function to apply a rest parameter to. - * @param {number} [start=func.length-1] The start position of the rest parameter. - * @returns {Function} Returns the new function. - * @example - * - * var say = _.rest(function(what, names) { - * return what + ' ' + _.initial(names).join(', ') + - * (_.size(names) > 1 ? ', & ' : '') + _.last(names); - * }); - * - * say('hello', 'fred', 'barney', 'pebbles'); - * // => 'hello fred, barney, & pebbles' - */ - function rest(func, start) { - if (typeof func != 'function') { - throw new TypeError(FUNC_ERROR_TEXT); - } - start = nativeMax(start === undefined ? (func.length - 1) : toInteger(start), 0); - return function() { - var args = arguments, - index = -1, - length = nativeMax(args.length - start, 0), - array = Array(length); + ctor.prototype = { 'valueOf': 1, 'y': 1 }; + for (var key in new ctor) { props.push(key); } + for (key in arguments) { } - while (++index < length) { - array[index] = args[start + index]; - } - switch (start) { - case 0: return func.call(this, array); - case 1: return func.call(this, args[0], array); - case 2: return func.call(this, args[0], args[1], array); - } - var otherArgs = Array(start + 1); - index = -1; - while (++index < start) { - otherArgs[index] = args[index]; - } - otherArgs[start] = array; - return apply(func, this, otherArgs); - }; - } + /** + * Detect if an `arguments` object's [[Class]] is resolvable (all but Firefox < 4, IE < 9). + * + * @memberOf _.support + * @type boolean + */ + support.argsClass = toString.call(arguments) == argsClass; - /** - * Creates a function that invokes `func` with the `this` binding of the created - * function and an array of arguments much like [`Function#apply`](https://es5.github.io/#x15.3.4.3). - * - * **Note:** This method is based on the [spread operator](https://mdn.io/spread_operator). - * - * @static - * @memberOf _ - * @category Function - * @param {Function} func The function to spread arguments over. - * @param {number} [start=0] The start position of the spread. - * @returns {Function} Returns the new function. - * @example - * - * var say = _.spread(function(who, what) { - * return who + ' says ' + what; - * }); - * - * say(['fred', 'hello']); - * // => 'fred says hello' - * - * var numbers = Promise.all([ - * Promise.resolve(40), - * Promise.resolve(36) - * ]); - * - * numbers.then(_.spread(function(x, y) { - * return x + y; - * })); - * // => a Promise of 76 - */ - function spread(func, start) { - if (typeof func != 'function') { - throw new TypeError(FUNC_ERROR_TEXT); - } - start = start === undefined ? 0 : nativeMax(toInteger(start), 0); - return rest(function(args) { - var array = args[start], - otherArgs = args.slice(0, start); + /** + * Detect if `arguments` objects are `Object` objects (all but Narwhal and Opera < 10.5). + * + * @memberOf _.support + * @type boolean + */ + support.argsObject = arguments.constructor == Object && !(arguments instanceof Array); - if (array) { - arrayPush(otherArgs, array); - } - return apply(func, this, otherArgs); - }); - } + /** + * Detect if `name` or `message` properties of `Error.prototype` are + * enumerable by default. (IE < 9, Safari < 5.1) + * + * @memberOf _.support + * @type boolean + */ + support.enumErrorProps = propertyIsEnumerable.call(errorProto, 'message') || propertyIsEnumerable.call(errorProto, 'name'); - /** - * Creates a throttled function that only invokes `func` at most once per - * every `wait` milliseconds. The throttled function comes with a `cancel` - * method to cancel delayed `func` invocations and a `flush` method to - * immediately invoke them. Provide an options object to indicate whether - * `func` should be invoked on the leading and/or trailing edge of the `wait` - * timeout. The `func` is invoked with the last arguments provided to the - * throttled function. Subsequent calls to the throttled function return the - * result of the last `func` invocation. - * - * **Note:** If `leading` and `trailing` options are `true`, `func` is invoked - * on the trailing edge of the timeout only if the throttled function is - * invoked more than once during the `wait` timeout. - * - * See [David Corbacho's article](http://drupalmotion.com/article/debounce-and-throttle-visual-explanation) - * for details over the differences between `_.throttle` and `_.debounce`. - * - * @static - * @memberOf _ - * @category Function - * @param {Function} func The function to throttle. - * @param {number} [wait=0] The number of milliseconds to throttle invocations to. - * @param {Object} [options] The options object. - * @param {boolean} [options.leading=true] Specify invoking on the leading - * edge of the timeout. - * @param {boolean} [options.trailing=true] Specify invoking on the trailing - * edge of the timeout. - * @returns {Function} Returns the new throttled function. - * @example - * - * // Avoid excessively updating the position while scrolling. - * jQuery(window).on('scroll', _.throttle(updatePosition, 100)); - * - * // Invoke `renewToken` when the click event is fired, but not more than once every 5 minutes. - * var throttled = _.throttle(renewToken, 300000, { 'trailing': false }); - * jQuery(element).on('click', throttled); - * - * // Cancel the trailing throttled invocation. - * jQuery(window).on('popstate', throttled.cancel); - */ - function throttle(func, wait, options) { - var leading = true, - trailing = true; + /** + * Detect if `prototype` properties are enumerable by default. + * + * Firefox < 3.6, Opera > 9.50 - Opera < 11.60, and Safari < 5.1 + * (if the prototype or a property on the prototype has been set) + * incorrectly sets a function's `prototype` property [[Enumerable]] + * value to `true`. + * + * @memberOf _.support + * @type boolean + */ + support.enumPrototypes = propertyIsEnumerable.call(ctor, 'prototype'); - if (typeof func != 'function') { - throw new TypeError(FUNC_ERROR_TEXT); - } - if (isObject(options)) { - leading = 'leading' in options ? !!options.leading : leading; - trailing = 'trailing' in options ? !!options.trailing : trailing; - } - return debounce(func, wait, { - 'leading': leading, - 'maxWait': wait, - 'trailing': trailing - }); - } + /** + * Detect if functions can be decompiled by `Function#toString` + * (all but PS3 and older Opera mobile browsers & avoided in Windows 8 apps). + * + * @memberOf _.support + * @type boolean + */ + support.funcDecomp = !isNative(context.WinRTError) && reThis.test(runInContext); - /** - * Creates a function that accepts up to one argument, ignoring any - * additional arguments. - * - * @static - * @memberOf _ - * @category Function - * @param {Function} func The function to cap arguments for. - * @returns {Function} Returns the new function. - * @example - * - * _.map(['6', '8', '10'], _.unary(parseInt)); - * // => [6, 8, 10] - */ - function unary(func) { - return ary(func, 1); - } + /** + * Detect if `Function#name` is supported (all but IE). + * + * @memberOf _.support + * @type boolean + */ + support.funcNames = typeof Function.name == 'string'; - /** - * Creates a function that provides `value` to the wrapper function as its - * first argument. Any additional arguments provided to the function are - * appended to those provided to the wrapper function. The wrapper is invoked - * with the `this` binding of the created function. - * - * @static - * @memberOf _ - * @category Function - * @param {*} value The value to wrap. - * @param {Function} [wrapper=identity] The wrapper function. - * @returns {Function} Returns the new function. - * @example - * - * var p = _.wrap(_.escape, function(func, text) { - * return '

' + func(text) + '

'; - * }); - * - * p('fred, barney, & pebbles'); - * // => '

fred, barney, & pebbles

' - */ - function wrap(value, wrapper) { - wrapper = wrapper == null ? identity : wrapper; - return partial(wrapper, value); - } + /** + * Detect if `arguments` object indexes are non-enumerable + * (Firefox < 4, IE < 9, PhantomJS, Safari < 5.1). + * + * @memberOf _.support + * @type boolean + */ + support.nonEnumArgs = key != 0; - /*------------------------------------------------------------------------*/ + /** + * Detect if properties shadowing those on `Object.prototype` are non-enumerable. + * + * In IE < 9 an objects own properties, shadowing non-enumerable ones, are + * made non-enumerable as well (a.k.a the JScript [[DontEnum]] bug). + * + * @memberOf _.support + * @type boolean + */ + support.nonEnumShadows = !/valueOf/.test(props); - /** - * Casts `value` as an array if it's not one. - * - * @static - * @memberOf _ - * @category Lang - * @param {*} value The value to inspect. - * @returns {Array} Returns the cast array. - * @example - * - * _.castArray(1); - * // => [1] - * - * _.castArray({ 'a': 1 }); - * // => [{ 'a': 1 }] - * - * _.castArray('abc'); - * // => ['abc'] - * - * _.castArray(null); - * // => [null] - * - * _.castArray(undefined); - * // => [undefined] - * - * _.castArray(); - * // => [] - * - * var array = [1, 2, 3]; - * console.log(_.castArray(array) === array); - * // => true - */ - function castArray() { - if (!arguments.length) { - return []; + /** + * Detect if own properties are iterated after inherited properties (all but IE < 9). + * + * @memberOf _.support + * @type boolean + */ + support.ownLast = props[0] != 'x'; + + /** + * Detect if `Array#shift` and `Array#splice` augment array-like objects correctly. + * + * Firefox < 10, IE compatibility mode, and IE < 9 have buggy Array `shift()` + * and `splice()` functions that fail to remove the last element, `value[0]`, + * of array-like objects even though the `length` property is set to `0`. + * The `shift()` method is buggy in IE 8 compatibility mode, while `splice()` + * is buggy regardless of mode in IE < 9 and buggy in compatibility mode in IE 9. + * + * @memberOf _.support + * @type boolean + */ + support.spliceObjects = (arrayRef.splice.call(object, 0, 1), !object[0]); + + /** + * Detect lack of support for accessing string characters by index. + * + * IE < 8 can't access characters by index and IE 8 can only access + * characters by index on string literals. + * + * @memberOf _.support + * @type boolean + */ + support.unindexedChars = ('x'[0] + Object('x')[0]) != 'xx'; + + /** + * Detect if a DOM node's [[Class]] is resolvable (all but IE < 9) + * and that the JS engine errors when attempting to coerce an object to + * a string without a `toString` function. + * + * @memberOf _.support + * @type boolean + */ + try { + support.nodeClass = !(toString.call(document) == objectClass && !({ 'toString': 0 } + '')); + } catch(e) { + support.nodeClass = true; } - var value = arguments[0]; - return isArray(value) ? value : [value]; - } + }(1)); /** - * Creates a shallow clone of `value`. - * - * **Note:** This method is loosely based on the - * [structured clone algorithm](https://mdn.io/Structured_clone_algorithm) - * and supports cloning arrays, array buffers, booleans, date objects, maps, - * numbers, `Object` objects, regexes, sets, strings, symbols, and typed - * arrays. The own enumerable properties of `arguments` objects are cloned - * as plain objects. An empty object is returned for uncloneable values such - * as error objects, functions, DOM nodes, and WeakMaps. + * By default, the template delimiters used by Lo-Dash are similar to those in + * embedded Ruby (ERB). Change the following template settings to use alternative + * delimiters. * * @static * @memberOf _ - * @category Lang - * @param {*} value The value to clone. - * @returns {*} Returns the cloned value. - * @example - * - * var objects = [{ 'a': 1 }, { 'b': 2 }]; - * - * var shallow = _.clone(objects); - * console.log(shallow[0] === objects[0]); - * // => true + * @type Object */ - function clone(value) { - return baseClone(value, false, true); - } + lodash.templateSettings = { - /** - * This method is like `_.clone` except that it accepts `customizer` which - * is invoked to produce the cloned value. If `customizer` returns `undefined` - * cloning is handled by the method instead. The `customizer` is invoked with - * up to four arguments; (value [, index|key, object, stack]). - * - * @static - * @memberOf _ - * @category Lang - * @param {*} value The value to clone. - * @param {Function} [customizer] The function to customize cloning. - * @returns {*} Returns the cloned value. - * @example - * - * function customizer(value) { - * if (_.isElement(value)) { - * return value.cloneNode(false); - * } - * } - * - * var el = _.cloneWith(document.body, customizer); - * - * console.log(el === document.body); - * // => false - * console.log(el.nodeName); - * // => 'BODY' - * console.log(el.childNodes.length); - * // => 0 - */ - function cloneWith(value, customizer) { - return baseClone(value, false, true, customizer); - } + /** + * Used to detect `data` property values to be HTML-escaped. + * + * @memberOf _.templateSettings + * @type RegExp + */ + 'escape': /<%-([\s\S]+?)%>/g, - /** - * This method is like `_.clone` except that it recursively clones `value`. - * - * @static - * @memberOf _ - * @category Lang - * @param {*} value The value to recursively clone. - * @returns {*} Returns the deep cloned value. - * @example - * - * var objects = [{ 'a': 1 }, { 'b': 2 }]; - * - * var deep = _.cloneDeep(objects); - * console.log(deep[0] === objects[0]); - * // => false - */ - function cloneDeep(value) { - return baseClone(value, true, true); - } + /** + * Used to detect code to be evaluated. + * + * @memberOf _.templateSettings + * @type RegExp + */ + 'evaluate': /<%([\s\S]+?)%>/g, + + /** + * Used to detect `data` property values to inject. + * + * @memberOf _.templateSettings + * @type RegExp + */ + 'interpolate': reInterpolate, + + /** + * Used to reference the data object in the template text. + * + * @memberOf _.templateSettings + * @type string + */ + 'variable': '', + + /** + * Used to import variables into the compiled template. + * + * @memberOf _.templateSettings + * @type Object + */ + 'imports': { + + /** + * A reference to the `lodash` function. + * + * @memberOf _.templateSettings.imports + * @type Function + */ + '_': lodash + } + }; + + /*--------------------------------------------------------------------------*/ + + /** + * The template used to create iterator functions. + * + * @private + * @param {Object} data The data object used to populate the text. + * @returns {string} Returns the interpolated text. + */ + var iteratorTemplate = template( + // the `iterable` may be reassigned by the `top` snippet + 'var index, iterable = <%= firstArg %>, ' + + // assign the `result` variable an initial value + 'result = <%= init %>;\n' + + // exit early if the first argument is falsey + 'if (!iterable) return result;\n' + + // add code before the iteration branches + '<%= top %>;' + + + // array-like iteration: + '<% if (array) { %>\n' + + 'var length = iterable.length; index = -1;\n' + + 'if (<%= array %>) {' + + + // add support for accessing string characters by index if needed + ' <% if (support.unindexedChars) { %>\n' + + ' if (isString(iterable)) {\n' + + " iterable = iterable.split('')\n" + + ' }' + + ' <% } %>\n' + + + // iterate over the array-like value + ' while (++index < length) {\n' + + ' <%= loop %>;\n' + + ' }\n' + + '}\n' + + 'else {' + + + // object iteration: + // add support for iterating over `arguments` objects if needed + ' <% } else if (support.nonEnumArgs) { %>\n' + + ' var length = iterable.length; index = -1;\n' + + ' if (length && isArguments(iterable)) {\n' + + ' while (++index < length) {\n' + + " index += '';\n" + + ' <%= loop %>;\n' + + ' }\n' + + ' } else {' + + ' <% } %>' + + + // avoid iterating over `prototype` properties in older Firefox, Opera, and Safari + ' <% if (support.enumPrototypes) { %>\n' + + " var skipProto = typeof iterable == 'function';\n" + + ' <% } %>' + + + // avoid iterating over `Error.prototype` properties in older IE and Safari + ' <% if (support.enumErrorProps) { %>\n' + + ' var skipErrorProps = iterable === errorProto || iterable instanceof Error;\n' + + ' <% } %>' + + + // define conditions used in the loop + ' <%' + + ' var conditions = [];' + + ' if (support.enumPrototypes) { conditions.push(\'!(skipProto && index == "prototype")\'); }' + + ' if (support.enumErrorProps) { conditions.push(\'!(skipErrorProps && (index == "message" || index == "name"))\'); }' + + ' %>' + + + // iterate own properties using `Object.keys` + ' <% if (useHas && keys) { %>\n' + + ' var ownIndex = -1,\n' + + ' ownProps = objectTypes[typeof iterable] && keys(iterable),\n' + + ' length = ownProps ? ownProps.length : 0;\n\n' + + ' while (++ownIndex < length) {\n' + + ' index = ownProps[ownIndex];\n<%' + + " if (conditions.length) { %> if (<%= conditions.join(' && ') %>) {\n <% } %>" + + ' <%= loop %>;' + + ' <% if (conditions.length) { %>\n }<% } %>\n' + + ' }' + + + // else using a for-in loop + ' <% } else { %>\n' + + ' for (index in iterable) {\n<%' + + ' if (useHas) { conditions.push("hasOwnProperty.call(iterable, index)"); }' + + " if (conditions.length) { %> if (<%= conditions.join(' && ') %>) {\n <% } %>" + + ' <%= loop %>;' + + ' <% if (conditions.length) { %>\n }<% } %>\n' + + ' }' + + + // Because IE < 9 can't set the `[[Enumerable]]` attribute of an + // existing property and the `constructor` property of a prototype + // defaults to non-enumerable, Lo-Dash skips the `constructor` + // property when it infers it's iterating over a `prototype` object. + ' <% if (support.nonEnumShadows) { %>\n\n' + + ' if (iterable !== objectProto) {\n' + + " var ctor = iterable.constructor,\n" + + ' isProto = iterable === (ctor && ctor.prototype),\n' + + ' className = iterable === stringProto ? stringClass : iterable === errorProto ? errorClass : toString.call(iterable),\n' + + ' nonEnum = nonEnumProps[className];\n' + + ' <% for (k = 0; k < 7; k++) { %>\n' + + " index = '<%= shadowedProps[k] %>';\n" + + ' if ((!(isProto && nonEnum[index]) && hasOwnProperty.call(iterable, index))<%' + + ' if (!useHas) { %> || (!nonEnum[index] && iterable[index] !== objectProto[index])<% }' + + ' %>) {\n' + + ' <%= loop %>;\n' + + ' }' + + ' <% } %>\n' + + ' }' + + ' <% } %>' + + ' <% } %>' + + ' <% if (array || support.nonEnumArgs) { %>\n}<% } %>\n' + + + // add code to the bottom of the iteration function + '<%= bottom %>;\n' + + // finally, return the `result` + 'return result' + ); + + /*--------------------------------------------------------------------------*/ /** - * This method is like `_.cloneWith` except that it recursively clones `value`. - * - * @static - * @memberOf _ - * @category Lang - * @param {*} value The value to recursively clone. - * @param {Function} [customizer] The function to customize cloning. - * @returns {*} Returns the deep cloned value. - * @example - * - * function customizer(value) { - * if (_.isElement(value)) { - * return value.cloneNode(true); - * } - * } + * The base implementation of `_.bind` that creates the bound function and + * sets its meta data. * - * var el = _.cloneDeepWith(document.body, customizer); - * - * console.log(el === document.body); - * // => false - * console.log(el.nodeName); - * // => 'BODY' - * console.log(el.childNodes.length); - * // => 20 + * @private + * @param {Array} bindData The bind data array. + * @returns {Function} Returns the new bound function. */ - function cloneDeepWith(value, customizer) { - return baseClone(value, true, true, customizer); + function baseBind(bindData) { + var func = bindData[0], + partialArgs = bindData[2], + thisArg = bindData[4]; + + function bound() { + // `Function#bind` spec + // http://es5.github.io/#x15.3.4.5 + if (partialArgs) { + // avoid `arguments` object deoptimizations by using `slice` instead + // of `Array.prototype.slice.call` and not assigning `arguments` to a + // variable as a ternary expression + var args = slice(partialArgs); + push.apply(args, arguments); + } + // mimic the constructor's `return` behavior + // http://es5.github.io/#x13.2.2 + if (this instanceof bound) { + // ensure `new bound` is an instance of `func` + var thisBinding = baseCreate(func.prototype), + result = func.apply(thisBinding, args || arguments); + return isObject(result) ? result : thisBinding; + } + return func.apply(thisArg, args || arguments); + } + setBindData(bound, bindData); + return bound; } /** - * Performs a [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero) - * comparison between two values to determine if they are equivalent. - * - * @static - * @memberOf _ - * @category Lang - * @param {*} value The value to compare. - * @param {*} other The other value to compare. - * @returns {boolean} Returns `true` if the values are equivalent, else `false`. - * @example - * - * var object = { 'user': 'fred' }; - * var other = { 'user': 'fred' }; - * - * _.eq(object, object); - * // => true - * - * _.eq(object, other); - * // => false + * The base implementation of `_.clone` without argument juggling or support + * for `thisArg` binding. * - * _.eq('a', 'a'); - * // => true - * - * _.eq('a', Object('a')); - * // => false - * - * _.eq(NaN, NaN); - * // => true + * @private + * @param {*} value The value to clone. + * @param {boolean} [isDeep=false] Specify a deep clone. + * @param {Function} [callback] The function to customize cloning values. + * @param {Array} [stackA=[]] Tracks traversed source objects. + * @param {Array} [stackB=[]] Associates clones with source counterparts. + * @returns {*} Returns the cloned value. */ - function eq(value, other) { - return value === other || (value !== value && other !== other); + function baseClone(value, isDeep, callback, stackA, stackB) { + if (callback) { + var result = callback(value); + if (typeof result != 'undefined') { + return result; + } + } + // inspect [[Class]] + var isObj = isObject(value); + if (isObj) { + var className = toString.call(value); + if (!cloneableClasses[className] || (!support.nodeClass && isNode(value))) { + return value; + } + var ctor = ctorByClass[className]; + switch (className) { + case boolClass: + case dateClass: + return new ctor(+value); + + case numberClass: + case stringClass: + return new ctor(value); + + case regexpClass: + result = ctor(value.source, reFlags.exec(value)); + result.lastIndex = value.lastIndex; + return result; + } + } else { + return value; + } + var isArr = isArray(value); + if (isDeep) { + // check for circular references and return corresponding clone + var initedStack = !stackA; + stackA || (stackA = getArray()); + stackB || (stackB = getArray()); + + var length = stackA.length; + while (length--) { + if (stackA[length] == value) { + return stackB[length]; + } + } + result = isArr ? ctor(value.length) : {}; + } + else { + result = isArr ? slice(value) : assign({}, value); + } + // add array properties assigned by `RegExp#exec` + if (isArr) { + if (hasOwnProperty.call(value, 'index')) { + result.index = value.index; + } + if (hasOwnProperty.call(value, 'input')) { + result.input = value.input; + } + } + // exit for shallow clone + if (!isDeep) { + return result; + } + // add the source value to the stack of traversed objects + // and associate it with its clone + stackA.push(value); + stackB.push(result); + + // recursively populate clone (susceptible to call stack limits) + (isArr ? baseEach : forOwn)(value, function(objValue, key) { + result[key] = baseClone(objValue, isDeep, callback, stackA, stackB); + }); + + if (initedStack) { + releaseArray(stackA); + releaseArray(stackB); + } + return result; } /** - * Checks if `value` is greater than `other`. - * - * @static - * @memberOf _ - * @category Lang - * @param {*} value The value to compare. - * @param {*} other The other value to compare. - * @returns {boolean} Returns `true` if `value` is greater than `other`, else `false`. - * @example - * - * _.gt(3, 1); - * // => true - * - * _.gt(3, 3); - * // => false + * The base implementation of `_.create` without support for assigning + * properties to the created object. * - * _.gt(1, 3); - * // => false + * @private + * @param {Object} prototype The object to inherit from. + * @returns {Object} Returns the new object. */ - function gt(value, other) { - return value > other; + function baseCreate(prototype, properties) { + return isObject(prototype) ? nativeCreate(prototype) : {}; + } + // fallback for browsers without `Object.create` + if (!nativeCreate) { + baseCreate = (function() { + function Object() {} + return function(prototype) { + if (isObject(prototype)) { + Object.prototype = prototype; + var result = new Object; + Object.prototype = null; + } + return result || context.Object(); + }; + }()); } /** - * Checks if `value` is greater than or equal to `other`. - * - * @static - * @memberOf _ - * @category Lang - * @param {*} value The value to compare. - * @param {*} other The other value to compare. - * @returns {boolean} Returns `true` if `value` is greater than or equal to `other`, else `false`. - * @example - * - * _.gte(3, 1); - * // => true - * - * _.gte(3, 3); - * // => true + * The base implementation of `_.createCallback` without support for creating + * "_.pluck" or "_.where" style callbacks. * - * _.gte(1, 3); - * // => false + * @private + * @param {*} [func=identity] The value to convert to a callback. + * @param {*} [thisArg] The `this` binding of the created callback. + * @param {number} [argCount] The number of arguments the callback accepts. + * @returns {Function} Returns a callback function. */ - function gte(value, other) { - return value >= other; + function baseCreateCallback(func, thisArg, argCount) { + if (typeof func != 'function') { + return identity; + } + // exit early for no `thisArg` or already bound by `Function#bind` + if (typeof thisArg == 'undefined' || !('prototype' in func)) { + return func; + } + var bindData = func.__bindData__; + if (typeof bindData == 'undefined') { + if (support.funcNames) { + bindData = !func.name; + } + bindData = bindData || !support.funcDecomp; + if (!bindData) { + var source = fnToString.call(func); + if (!support.funcNames) { + bindData = !reFuncName.test(source); + } + if (!bindData) { + // checks if `func` references the `this` keyword and stores the result + bindData = reThis.test(source); + setBindData(func, bindData); + } + } + } + // exit early if there are no `this` references or `func` is bound + if (bindData === false || (bindData !== true && bindData[1] & 1)) { + return func; + } + switch (argCount) { + case 1: return function(value) { + return func.call(thisArg, value); + }; + case 2: return function(a, b) { + return func.call(thisArg, a, b); + }; + case 3: return function(value, index, collection) { + return func.call(thisArg, value, index, collection); + }; + case 4: return function(accumulator, value, index, collection) { + return func.call(thisArg, accumulator, value, index, collection); + }; + } + return bind(func, thisArg); } /** - * Checks if `value` is likely an `arguments` object. + * The base implementation of `createWrapper` that creates the wrapper and + * sets its meta data. * - * @static - * @memberOf _ - * @category Lang - * @param {*} value The value to check. - * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`. - * @example - * - * _.isArguments(function() { return arguments; }()); - * // => true - * - * _.isArguments([1, 2, 3]); - * // => false + * @private + * @param {Array} bindData The bind data array. + * @returns {Function} Returns the new function. */ - function isArguments(value) { - // Safari 8.1 incorrectly makes `arguments.callee` enumerable in strict mode. - return isArrayLikeObject(value) && hasOwnProperty.call(value, 'callee') && - (!propertyIsEnumerable.call(value, 'callee') || objectToString.call(value) == argsTag); + function baseCreateWrapper(bindData) { + var func = bindData[0], + bitmask = bindData[1], + partialArgs = bindData[2], + partialRightArgs = bindData[3], + thisArg = bindData[4], + arity = bindData[5]; + + var isBind = bitmask & 1, + isBindKey = bitmask & 2, + isCurry = bitmask & 4, + isCurryBound = bitmask & 8, + key = func; + + function bound() { + var thisBinding = isBind ? thisArg : this; + if (partialArgs) { + var args = slice(partialArgs); + push.apply(args, arguments); + } + if (partialRightArgs || isCurry) { + args || (args = slice(arguments)); + if (partialRightArgs) { + push.apply(args, partialRightArgs); + } + if (isCurry && args.length < arity) { + bitmask |= 16 & ~32; + return baseCreateWrapper([func, (isCurryBound ? bitmask : bitmask & ~3), args, null, thisArg, arity]); + } + } + args || (args = arguments); + if (isBindKey) { + func = thisBinding[key]; + } + if (this instanceof bound) { + thisBinding = baseCreate(func.prototype); + var result = func.apply(thisBinding, args); + return isObject(result) ? result : thisBinding; + } + return func.apply(thisBinding, args); + } + setBindData(bound, bindData); + return bound; } /** - * Checks if `value` is classified as an `Array` object. - * - * @static - * @memberOf _ - * @type {Function} - * @category Lang - * @param {*} value The value to check. - * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`. - * @example - * - * _.isArray([1, 2, 3]); - * // => true - * - * _.isArray(document.body.children); - * // => false + * The base implementation of `_.difference` that accepts a single array + * of values to exclude. * - * _.isArray('abc'); - * // => false - * - * _.isArray(_.noop); - * // => false + * @private + * @param {Array} array The array to process. + * @param {Array} [values] The array of values to exclude. + * @returns {Array} Returns a new array of filtered values. */ - var isArray = Array.isArray; + function baseDifference(array, values) { + var index = -1, + indexOf = getIndexOf(), + length = array ? array.length : 0, + isLarge = length >= largeArraySize && indexOf === baseIndexOf, + result = []; - /** - * Checks if `value` is classified as an `ArrayBuffer` object. - * - * @static - * @memberOf _ - * @category Lang - * @param {*} value The value to check. - * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`. - * @example - * - * _.isArrayBuffer(new ArrayBuffer(2)); - * // => true - * - * _.isArrayBuffer(new Array(2)); - * // => false - */ - function isArrayBuffer(value) { - return isObjectLike(value) && objectToString.call(value) == arrayBufferTag; + if (isLarge) { + var cache = createCache(values); + if (cache) { + indexOf = cacheIndexOf; + values = cache; + } else { + isLarge = false; + } + } + while (++index < length) { + var value = array[index]; + if (indexOf(values, value) < 0) { + result.push(value); + } + } + if (isLarge) { + releaseObject(values); + } + return result; } /** - * Checks if `value` is array-like. A value is considered array-like if it's - * not a function and has a `value.length` that's an integer greater than or - * equal to `0` and less than or equal to `Number.MAX_SAFE_INTEGER`. - * - * @static - * @memberOf _ - * @category Lang - * @param {*} value The value to check. - * @returns {boolean} Returns `true` if `value` is array-like, else `false`. - * @example - * - * _.isArrayLike([1, 2, 3]); - * // => true + * The base implementation of `_.flatten` without support for callback + * shorthands or `thisArg` binding. * - * _.isArrayLike(document.body.children); - * // => true - * - * _.isArrayLike('abc'); - * // => true - * - * _.isArrayLike(_.noop); - * // => false + * @private + * @param {Array} array The array to flatten. + * @param {boolean} [isShallow=false] A flag to restrict flattening to a single level. + * @param {boolean} [isStrict=false] A flag to restrict flattening to arrays and `arguments` objects. + * @param {number} [fromIndex=0] The index to start from. + * @returns {Array} Returns a new flattened array. */ - function isArrayLike(value) { - return value != null && isLength(getLength(value)) && !isFunction(value); - } + function baseFlatten(array, isShallow, isStrict, fromIndex) { + var index = (fromIndex || 0) - 1, + length = array ? array.length : 0, + result = []; - /** - * This method is like `_.isArrayLike` except that it also checks if `value` - * is an object. - * - * @static - * @memberOf _ - * @category Lang - * @param {*} value The value to check. - * @returns {boolean} Returns `true` if `value` is an array-like object, else `false`. - * @example - * - * _.isArrayLikeObject([1, 2, 3]); - * // => true - * - * _.isArrayLikeObject(document.body.children); - * // => true - * - * _.isArrayLikeObject('abc'); - * // => false - * - * _.isArrayLikeObject(_.noop); - * // => false - */ - function isArrayLikeObject(value) { - return isObjectLike(value) && isArrayLike(value); + while (++index < length) { + var value = array[index]; + + if (value && typeof value == 'object' && typeof value.length == 'number' + && (isArray(value) || isArguments(value))) { + // recursively flatten arrays (susceptible to call stack limits) + if (!isShallow) { + value = baseFlatten(value, isShallow, isStrict); + } + var valIndex = -1, + valLength = value.length, + resIndex = result.length; + + result.length += valLength; + while (++valIndex < valLength) { + result[resIndex++] = value[valIndex]; + } + } else if (!isStrict) { + result.push(value); + } + } + return result; } /** - * Checks if `value` is classified as a boolean primitive or object. - * - * @static - * @memberOf _ - * @category Lang - * @param {*} value The value to check. - * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`. - * @example - * - * _.isBoolean(false); - * // => true + * The base implementation of `_.isEqual`, without support for `thisArg` binding, + * that allows partial "_.where" style comparisons. * - * _.isBoolean(null); - * // => false + * @private + * @param {*} a The value to compare. + * @param {*} b The other value to compare. + * @param {Function} [callback] The function to customize comparing values. + * @param {Function} [isWhere=false] A flag to indicate performing partial comparisons. + * @param {Array} [stackA=[]] Tracks traversed `a` objects. + * @param {Array} [stackB=[]] Tracks traversed `b` objects. + * @returns {boolean} Returns `true` if the values are equivalent, else `false`. */ - function isBoolean(value) { - return value === true || value === false || - (isObjectLike(value) && objectToString.call(value) == boolTag); + function baseIsEqual(a, b, callback, isWhere, stackA, stackB) { + // used to indicate that when comparing objects, `a` has at least the properties of `b` + if (callback) { + var result = callback(a, b); + if (typeof result != 'undefined') { + return !!result; + } + } + // exit early for identical values + if (a === b) { + // treat `+0` vs. `-0` as not equal + return a !== 0 || (1 / a == 1 / b); + } + var type = typeof a, + otherType = typeof b; + + // exit early for unlike primitive values + if (a === a && + !(a && objectTypes[type]) && + !(b && objectTypes[otherType])) { + return false; + } + // exit early for `null` and `undefined` avoiding ES3's Function#call behavior + // http://es5.github.io/#x15.3.4.4 + if (a == null || b == null) { + return a === b; + } + // compare [[Class]] names + var className = toString.call(a), + otherClass = toString.call(b); + + if (className == argsClass) { + className = objectClass; + } + if (otherClass == argsClass) { + otherClass = objectClass; + } + if (className != otherClass) { + return false; + } + switch (className) { + case boolClass: + case dateClass: + // coerce dates and booleans to numbers, dates to milliseconds and booleans + // to `1` or `0` treating invalid dates coerced to `NaN` as not equal + return +a == +b; + + case numberClass: + // treat `NaN` vs. `NaN` as equal + return (a != +a) + ? b != +b + // but treat `+0` vs. `-0` as not equal + : (a == 0 ? (1 / a == 1 / b) : a == +b); + + case regexpClass: + case stringClass: + // coerce regexes to strings (http://es5.github.io/#x15.10.6.4) + // treat string primitives and their corresponding object instances as equal + return a == String(b); + } + var isArr = className == arrayClass; + if (!isArr) { + // unwrap any `lodash` wrapped values + var aWrapped = hasOwnProperty.call(a, '__wrapped__'), + bWrapped = hasOwnProperty.call(b, '__wrapped__'); + + if (aWrapped || bWrapped) { + return baseIsEqual(aWrapped ? a.__wrapped__ : a, bWrapped ? b.__wrapped__ : b, callback, isWhere, stackA, stackB); + } + // exit for functions and DOM nodes + if (className != objectClass || (!support.nodeClass && (isNode(a) || isNode(b)))) { + return false; + } + // in older versions of Opera, `arguments` objects have `Array` constructors + var ctorA = !support.argsObject && isArguments(a) ? Object : a.constructor, + ctorB = !support.argsObject && isArguments(b) ? Object : b.constructor; + + // non `Object` object instances with different constructors are not equal + if (ctorA != ctorB && + !(isFunction(ctorA) && ctorA instanceof ctorA && isFunction(ctorB) && ctorB instanceof ctorB) && + ('constructor' in a && 'constructor' in b) + ) { + return false; + } + } + // assume cyclic structures are equal + // the algorithm for detecting cyclic structures is adapted from ES 5.1 + // section 15.12.3, abstract operation `JO` (http://es5.github.io/#x15.12.3) + var initedStack = !stackA; + stackA || (stackA = getArray()); + stackB || (stackB = getArray()); + + var length = stackA.length; + while (length--) { + if (stackA[length] == a) { + return stackB[length] == b; + } + } + var size = 0; + result = true; + + // add `a` and `b` to the stack of traversed objects + stackA.push(a); + stackB.push(b); + + // recursively compare objects and arrays (susceptible to call stack limits) + if (isArr) { + // compare lengths to determine if a deep comparison is necessary + length = a.length; + size = b.length; + result = size == length; + + if (result || isWhere) { + // deep compare the contents, ignoring non-numeric properties + while (size--) { + var index = length, + value = b[size]; + + if (isWhere) { + while (index--) { + if ((result = baseIsEqual(a[index], value, callback, isWhere, stackA, stackB))) { + break; + } + } + } else if (!(result = baseIsEqual(a[size], value, callback, isWhere, stackA, stackB))) { + break; + } + } + } + } + else { + // deep compare objects using `forIn`, instead of `forOwn`, to avoid `Object.keys` + // which, in this case, is more costly + forIn(b, function(value, key, b) { + if (hasOwnProperty.call(b, key)) { + // count the number of properties. + size++; + // deep compare each property value. + return (result = hasOwnProperty.call(a, key) && baseIsEqual(a[key], value, callback, isWhere, stackA, stackB)); + } + }); + + if (result && !isWhere) { + // ensure both objects have the same number of properties + forIn(a, function(value, key, a) { + if (hasOwnProperty.call(a, key)) { + // `size` will be `-1` if `a` has more properties than `b` + return (result = --size > -1); + } + }); + } + } + stackA.pop(); + stackB.pop(); + + if (initedStack) { + releaseArray(stackA); + releaseArray(stackB); + } + return result; } /** - * Checks if `value` is a buffer. - * - * @static - * @memberOf _ - * @category Lang - * @param {*} value The value to check. - * @returns {boolean} Returns `true` if `value` is a buffer, else `false`. - * @example - * - * _.isBuffer(new Buffer(2)); - * // => true + * The base implementation of `_.merge` without argument juggling or support + * for `thisArg` binding. * - * _.isBuffer(new Uint8Array(2)); - * // => false - */ - var isBuffer = !Buffer ? constant(false) : function(value) { - return value instanceof Buffer; - }; + * @private + * @param {Object} object The destination object. + * @param {Object} source The source object. + * @param {Function} [callback] The function to customize merging properties. + * @param {Array} [stackA=[]] Tracks traversed source objects. + * @param {Array} [stackB=[]] Associates values with source counterparts. + */ + function baseMerge(object, source, callback, stackA, stackB) { + (isArray(source) ? forEach : forOwn)(source, function(source, key) { + var found, + isArr, + result = source, + value = object[key]; + + if (source && ((isArr = isArray(source)) || isPlainObject(source))) { + // avoid merging previously merged cyclic sources + var stackLength = stackA.length; + while (stackLength--) { + if ((found = stackA[stackLength] == source)) { + value = stackB[stackLength]; + break; + } + } + if (!found) { + var isShallow; + if (callback) { + result = callback(value, source); + if ((isShallow = typeof result != 'undefined')) { + value = result; + } + } + if (!isShallow) { + value = isArr + ? (isArray(value) ? value : []) + : (isPlainObject(value) ? value : {}); + } + // add `source` and associated `value` to the stack of traversed objects + stackA.push(source); + stackB.push(value); - /** - * Checks if `value` is classified as a `Date` object. - * - * @static - * @memberOf _ - * @category Lang - * @param {*} value The value to check. - * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`. - * @example - * - * _.isDate(new Date); - * // => true - * - * _.isDate('Mon April 23 2012'); - * // => false - */ - function isDate(value) { - return isObjectLike(value) && objectToString.call(value) == dateTag; + // recursively merge objects and arrays (susceptible to call stack limits) + if (!isShallow) { + baseMerge(value, source, callback, stackA, stackB); + } + } + } + else { + if (callback) { + result = callback(value, source); + if (typeof result == 'undefined') { + result = source; + } + } + if (typeof result != 'undefined') { + value = result; + } + } + object[key] = value; + }); } /** - * Checks if `value` is likely a DOM element. - * - * @static - * @memberOf _ - * @category Lang - * @param {*} value The value to check. - * @returns {boolean} Returns `true` if `value` is a DOM element, else `false`. - * @example - * - * _.isElement(document.body); - * // => true + * The base implementation of `_.random` without argument juggling or support + * for returning floating-point numbers. * - * _.isElement(''); - * // => false + * @private + * @param {number} min The minimum possible value. + * @param {number} max The maximum possible value. + * @returns {number} Returns a random number. */ - function isElement(value) { - return !!value && value.nodeType === 1 && isObjectLike(value) && !isPlainObject(value); + function baseRandom(min, max) { + return min + floor(nativeRandom() * (max - min + 1)); } /** - * Checks if `value` is an empty collection or object. A value is considered - * empty if it's an `arguments` object, array, string, or jQuery-like collection - * with a length of `0` or has no own enumerable properties. - * - * @static - * @memberOf _ - * @category Lang - * @param {*} value The value to check. - * @returns {boolean} Returns `true` if `value` is empty, else `false`. - * @example - * - * _.isEmpty(null); - * // => true - * - * _.isEmpty(true); - * // => true - * - * _.isEmpty(1); - * // => true + * The base implementation of `_.uniq` without support for callback shorthands + * or `thisArg` binding. * - * _.isEmpty([1, 2, 3]); - * // => false - * - * _.isEmpty({ 'a': 1 }); - * // => false + * @private + * @param {Array} array The array to process. + * @param {boolean} [isSorted=false] A flag to indicate that `array` is sorted. + * @param {Function} [callback] The function called per iteration. + * @returns {Array} Returns a duplicate-value-free array. */ - function isEmpty(value) { - if (isArrayLike(value) && - (isArray(value) || isString(value) || - isFunction(value.splice) || isArguments(value))) { - return !value.length; + function baseUniq(array, isSorted, callback) { + var index = -1, + indexOf = getIndexOf(), + length = array ? array.length : 0, + result = []; + + var isLarge = !isSorted && length >= largeArraySize && indexOf === baseIndexOf, + seen = (callback || isLarge) ? getArray() : result; + + if (isLarge) { + var cache = createCache(seen); + indexOf = cacheIndexOf; + seen = cache; } - for (var key in value) { - if (hasOwnProperty.call(value, key)) { - return false; + while (++index < length) { + var value = array[index], + computed = callback ? callback(value, index, array) : value; + + if (isSorted + ? !index || seen[seen.length - 1] !== computed + : indexOf(seen, computed) < 0 + ) { + if (callback || isLarge) { + seen.push(computed); + } + result.push(value); } } - return true; + if (isLarge) { + releaseArray(seen.array); + releaseObject(seen); + } else if (callback) { + releaseArray(seen); + } + return result; } /** - * Performs a deep comparison between two values to determine if they are - * equivalent. - * - * **Note:** This method supports comparing arrays, array buffers, booleans, - * date objects, error objects, maps, numbers, `Object` objects, regexes, - * sets, strings, symbols, and typed arrays. `Object` objects are compared - * by their own, not inherited, enumerable properties. Functions and DOM - * nodes are **not** supported. + * Creates a function that aggregates a collection, creating an object composed + * of keys generated from the results of running each element of the collection + * through a callback. The given `setter` function sets the keys and values + * of the composed object. * - * @static - * @memberOf _ - * @category Lang - * @param {*} value The value to compare. - * @param {*} other The other value to compare. - * @returns {boolean} Returns `true` if the values are equivalent, else `false`. - * @example - * - * var object = { 'user': 'fred' }; - * var other = { 'user': 'fred' }; - * - * _.isEqual(object, other); - * // => true - * - * object === other; - * // => false + * @private + * @param {Function} setter The setter function. + * @returns {Function} Returns the new aggregator function. */ - function isEqual(value, other) { - return baseIsEqual(value, other); + function createAggregator(setter) { + return function(collection, callback, thisArg) { + var result = {}; + callback = lodash.createCallback(callback, thisArg, 3); + + if (isArray(collection)) { + var index = -1, + length = collection.length; + + while (++index < length) { + var value = collection[index]; + setter(result, value, callback(value, index, collection), collection); + } + } else { + baseEach(collection, function(value, key, collection) { + setter(result, value, callback(value, key, collection), collection); + }); + } + return result; + }; } /** - * This method is like `_.isEqual` except that it accepts `customizer` which - * is invoked to compare values. If `customizer` returns `undefined` comparisons - * are handled by the method instead. The `customizer` is invoked with up to - * six arguments: (objValue, othValue [, index|key, object, other, stack]). - * - * @static - * @memberOf _ - * @category Lang - * @param {*} value The value to compare. - * @param {*} other The other value to compare. - * @param {Function} [customizer] The function to customize comparisons. - * @returns {boolean} Returns `true` if the values are equivalent, else `false`. - * @example - * - * function isGreeting(value) { - * return /^h(?:i|ello)$/.test(value); - * } - * - * function customizer(objValue, othValue) { - * if (isGreeting(objValue) && isGreeting(othValue)) { - * return true; - * } - * } + * Creates a function that, when called, either curries or invokes `func` + * with an optional `this` binding and partially applied arguments. * - * var array = ['hello', 'goodbye']; - * var other = ['hi', 'goodbye']; - * - * _.isEqualWith(array, other, customizer); - * // => true + * @private + * @param {Function|string} func The function or method name to reference. + * @param {number} bitmask The bitmask of method flags to compose. + * The bitmask may be composed of the following flags: + * 1 - `_.bind` + * 2 - `_.bindKey` + * 4 - `_.curry` + * 8 - `_.curry` (bound) + * 16 - `_.partial` + * 32 - `_.partialRight` + * @param {Array} [partialArgs] An array of arguments to prepend to those + * provided to the new function. + * @param {Array} [partialRightArgs] An array of arguments to append to those + * provided to the new function. + * @param {*} [thisArg] The `this` binding of `func`. + * @param {number} [arity] The arity of `func`. + * @returns {Function} Returns the new function. */ - function isEqualWith(value, other, customizer) { - customizer = typeof customizer == 'function' ? customizer : undefined; - var result = customizer ? customizer(value, other) : undefined; - return result === undefined ? baseIsEqual(value, other, customizer) : !!result; + function createWrapper(func, bitmask, partialArgs, partialRightArgs, thisArg, arity) { + var isBind = bitmask & 1, + isBindKey = bitmask & 2, + isCurry = bitmask & 4, + isCurryBound = bitmask & 8, + isPartial = bitmask & 16, + isPartialRight = bitmask & 32; + + if (!isBindKey && !isFunction(func)) { + throw new TypeError; + } + if (isPartial && !partialArgs.length) { + bitmask &= ~16; + isPartial = partialArgs = false; + } + if (isPartialRight && !partialRightArgs.length) { + bitmask &= ~32; + isPartialRight = partialRightArgs = false; + } + var bindData = func && func.__bindData__; + if (bindData && bindData !== true) { + // clone `bindData` + bindData = slice(bindData); + if (bindData[2]) { + bindData[2] = slice(bindData[2]); + } + if (bindData[3]) { + bindData[3] = slice(bindData[3]); + } + // set `thisBinding` is not previously bound + if (isBind && !(bindData[1] & 1)) { + bindData[4] = thisArg; + } + // set if previously bound but not currently (subsequent curried functions) + if (!isBind && bindData[1] & 1) { + bitmask |= 8; + } + // set curried arity if not yet set + if (isCurry && !(bindData[1] & 4)) { + bindData[5] = arity; + } + // append partial left arguments + if (isPartial) { + push.apply(bindData[2] || (bindData[2] = []), partialArgs); + } + // append partial right arguments + if (isPartialRight) { + unshift.apply(bindData[3] || (bindData[3] = []), partialRightArgs); + } + // merge flags + bindData[1] |= bitmask; + return createWrapper.apply(null, bindData); + } + // fast path for `_.bind` + var creater = (bitmask == 1 || bitmask === 17) ? baseBind : baseCreateWrapper; + return creater([func, bitmask, partialArgs, partialRightArgs, thisArg, arity]); } /** - * Checks if `value` is an `Error`, `EvalError`, `RangeError`, `ReferenceError`, - * `SyntaxError`, `TypeError`, or `URIError` object. - * - * @static - * @memberOf _ - * @category Lang - * @param {*} value The value to check. - * @returns {boolean} Returns `true` if `value` is an error object, else `false`. - * @example - * - * _.isError(new Error); - * // => true + * Creates compiled iteration functions. * - * _.isError(Error); - * // => false + * @private + * @param {...Object} [options] The compile options object(s). + * @param {string} [options.array] Code to determine if the iterable is an array or array-like. + * @param {boolean} [options.useHas] Specify using `hasOwnProperty` checks in the object loop. + * @param {Function} [options.keys] A reference to `_.keys` for use in own property iteration. + * @param {string} [options.args] A comma separated string of iteration function arguments. + * @param {string} [options.top] Code to execute before the iteration branches. + * @param {string} [options.loop] Code to execute in the object loop. + * @param {string} [options.bottom] Code to execute after the iteration branches. + * @returns {Function} Returns the compiled function. */ - function isError(value) { - if (!isObjectLike(value)) { - return false; + function createIterator() { + // data properties + iteratorData.shadowedProps = shadowedProps; + iteratorData.support = support; + + // iterator options + iteratorData.array = iteratorData.bottom = iteratorData.loop = iteratorData.top = ''; + iteratorData.init = 'iterable'; + iteratorData.useHas = true; + + // merge options into a template data object + for (var object, index = 0; object = arguments[index]; index++) { + for (var key in object) { + iteratorData[key] = object[key]; + } } - return (objectToString.call(value) == errorTag) || - (typeof value.message == 'string' && typeof value.name == 'string'); + var args = iteratorData.args; + iteratorData.firstArg = /^[^,]+/.exec(args)[0]; + + // create the function factory + var factory = Function( + 'baseCreateCallback, errorClass, errorProto, hasOwnProperty, ' + + 'indicatorObject, isArguments, isArray, isString, keys, objectProto, ' + + 'objectTypes, nonEnumProps, stringClass, stringProto, toString', + 'return function(' + args + ') {\n' + iteratorTemplate(iteratorData) + '\n}' + ); + + // return the compiled function + return factory( + baseCreateCallback, errorClass, errorProto, hasOwnProperty, + indicatorObject, isArguments, isArray, isString, iteratorData.keys, objectProto, + objectTypes, nonEnumProps, stringClass, stringProto, toString + ); } /** - * Checks if `value` is a finite primitive number. - * - * **Note:** This method is based on [`Number.isFinite`](https://mdn.io/Number/isFinite). - * - * @static - * @memberOf _ - * @category Lang - * @param {*} value The value to check. - * @returns {boolean} Returns `true` if `value` is a finite number, else `false`. - * @example + * Used by `escape` to convert characters to HTML entities. * - * _.isFinite(3); - * // => true - * - * _.isFinite(Number.MAX_VALUE); - * // => true - * - * _.isFinite(3.14); - * // => true - * - * _.isFinite(Infinity); - * // => false + * @private + * @param {string} match The matched character to escape. + * @returns {string} Returns the escaped character. */ - function isFinite(value) { - return typeof value == 'number' && nativeIsFinite(value); + function escapeHtmlChar(match) { + return htmlEscapes[match]; } /** - * Checks if `value` is classified as a `Function` object. - * - * @static - * @memberOf _ - * @category Lang - * @param {*} value The value to check. - * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`. - * @example - * - * _.isFunction(_); - * // => true + * Gets the appropriate "indexOf" function. If the `_.indexOf` method is + * customized, this method returns the custom method, otherwise it returns + * the `baseIndexOf` function. * - * _.isFunction(/abc/); - * // => false + * @private + * @returns {Function} Returns the "indexOf" function. */ - function isFunction(value) { - // The use of `Object#toString` avoids issues with the `typeof` operator - // in Safari 8 which returns 'object' for typed array and weak map constructors, - // and PhantomJS 1.9 which returns 'function' for `NodeList` instances. - var tag = isObject(value) ? objectToString.call(value) : ''; - return tag == funcTag || tag == genTag; + function getIndexOf() { + var result = (result = lodash.indexOf) === indexOf ? baseIndexOf : result; + return result; } /** - * Checks if `value` is an integer. - * - * **Note:** This method is based on [`Number.isInteger`](https://mdn.io/Number/isInteger). + * Checks if `value` is a native function. * - * @static - * @memberOf _ - * @category Lang + * @private * @param {*} value The value to check. - * @returns {boolean} Returns `true` if `value` is an integer, else `false`. - * @example - * - * _.isInteger(3); - * // => true - * - * _.isInteger(Number.MIN_VALUE); - * // => false - * - * _.isInteger(Infinity); - * // => false - * - * _.isInteger('3'); - * // => false + * @returns {boolean} Returns `true` if the `value` is a native function, else `false`. */ - function isInteger(value) { - return typeof value == 'number' && value == toInteger(value); + function isNative(value) { + return typeof value == 'function' && reNative.test(value); } /** - * Checks if `value` is a valid array-like length. - * - * **Note:** This function is loosely based on [`ToLength`](http://ecma-international.org/ecma-262/6.0/#sec-tolength). - * - * @static - * @memberOf _ - * @category Lang - * @param {*} value The value to check. - * @returns {boolean} Returns `true` if `value` is a valid length, else `false`. - * @example - * - * _.isLength(3); - * // => true - * - * _.isLength(Number.MIN_VALUE); - * // => false - * - * _.isLength(Infinity); - * // => false + * Sets `this` binding data on a given function. * - * _.isLength('3'); - * // => false + * @private + * @param {Function} func The function to set data on. + * @param {Array} value The data array to set. */ - function isLength(value) { - return typeof value == 'number' && - value > -1 && value % 1 == 0 && value <= MAX_SAFE_INTEGER; - } + var setBindData = !defineProperty ? noop : function(func, value) { + descriptor.value = value; + defineProperty(func, '__bindData__', descriptor); + }; /** - * Checks if `value` is the [language type](https://es5.github.io/#x8) of `Object`. - * (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`) + * A fallback implementation of `isPlainObject` which checks if a given value + * is an object created by the `Object` constructor, assuming objects created + * by the `Object` constructor have no inherited enumerable properties and that + * there are no `Object.prototype` extensions. * - * @static - * @memberOf _ - * @category Lang + * @private * @param {*} value The value to check. - * @returns {boolean} Returns `true` if `value` is an object, else `false`. - * @example - * - * _.isObject({}); - * // => true - * - * _.isObject([1, 2, 3]); - * // => true - * - * _.isObject(_.noop); - * // => true - * - * _.isObject(null); - * // => false + * @returns {boolean} Returns `true` if `value` is a plain object, else `false`. */ - function isObject(value) { - var type = typeof value; - return !!value && (type == 'object' || type == 'function'); - } + function shimIsPlainObject(value) { + var ctor, + result; - /** - * Checks if `value` is object-like. A value is object-like if it's not `null` - * and has a `typeof` result of "object". - * - * @static - * @memberOf _ - * @category Lang - * @param {*} value The value to check. - * @returns {boolean} Returns `true` if `value` is object-like, else `false`. - * @example - * - * _.isObjectLike({}); - * // => true - * - * _.isObjectLike([1, 2, 3]); - * // => true - * - * _.isObjectLike(_.noop); - * // => false + // avoid non Object objects, `arguments` objects, and DOM elements + if (!(value && toString.call(value) == objectClass) || + (ctor = value.constructor, isFunction(ctor) && !(ctor instanceof ctor)) || + (!support.argsClass && isArguments(value)) || + (!support.nodeClass && isNode(value))) { + return false; + } + // IE < 9 iterates inherited properties before own properties. If the first + // iterated property is an object's own property then there are no inherited + // enumerable properties. + if (support.ownLast) { + forIn(value, function(value, key, object) { + result = hasOwnProperty.call(object, key); + return false; + }); + return result !== false; + } + // In most environments an object's own properties are iterated before + // its inherited properties. If the last iterated property is an object's + // own property then there are no inherited enumerable properties. + forIn(value, function(value, key) { + result = key; + }); + return typeof result == 'undefined' || hasOwnProperty.call(value, result); + } + + /** + * Used by `unescape` to convert HTML entities to characters. * - * _.isObjectLike(null); - * // => false + * @private + * @param {string} match The matched character to unescape. + * @returns {string} Returns the unescaped character. */ - function isObjectLike(value) { - return !!value && typeof value == 'object'; + function unescapeHtmlChar(match) { + return htmlUnescapes[match]; } + /*--------------------------------------------------------------------------*/ + /** - * Checks if `value` is classified as a `Map` object. + * Checks if `value` is an `arguments` object. * * @static * @memberOf _ - * @category Lang + * @category Objects * @param {*} value The value to check. - * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`. + * @returns {boolean} Returns `true` if the `value` is an `arguments` object, else `false`. * @example * - * _.isMap(new Map); + * (function() { return _.isArguments(arguments); })(1, 2, 3); * // => true * - * _.isMap(new WeakMap); + * _.isArguments([1, 2, 3]); * // => false */ - function isMap(value) { - return isObjectLike(value) && getTag(value) == mapTag; + function isArguments(value) { + return value && typeof value == 'object' && typeof value.length == 'number' && + toString.call(value) == argsClass || false; + } + // fallback for browsers that can't detect `arguments` objects by [[Class]] + if (!support.argsClass) { + isArguments = function(value) { + return value && typeof value == 'object' && typeof value.length == 'number' && + hasOwnProperty.call(value, 'callee') && !propertyIsEnumerable.call(value, 'callee') || false; + }; } /** - * Performs a partial deep comparison between `object` and `source` to - * determine if `object` contains equivalent property values. This method is - * equivalent to a `_.matches` function when `source` is partially applied. - * - * **Note:** This method supports comparing the same values as `_.isEqual`. + * Checks if `value` is an array. * * @static * @memberOf _ - * @category Lang - * @param {Object} object The object to inspect. - * @param {Object} source The object of property values to match. - * @returns {boolean} Returns `true` if `object` is a match, else `false`. + * @type Function + * @category Objects + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if the `value` is an array, else `false`. * @example * - * var object = { 'user': 'fred', 'age': 40 }; + * (function() { return _.isArray(arguments); })(); + * // => false * - * _.isMatch(object, { 'age': 40 }); + * _.isArray([1, 2, 3]); * // => true + */ + var isArray = nativeIsArray || function(value) { + return value && typeof value == 'object' && typeof value.length == 'number' && + toString.call(value) == arrayClass || false; + }; + + /** + * A fallback implementation of `Object.keys` which produces an array of the + * given object's own enumerable property names. * - * _.isMatch(object, { 'age': 36 }); - * // => false + * @private + * @type Function + * @param {Object} object The object to inspect. + * @returns {Array} Returns an array of property names. */ - function isMatch(object, source) { - return object === source || baseIsMatch(object, source, getMatchData(source)); - } + var shimKeys = createIterator({ + 'args': 'object', + 'init': '[]', + 'top': 'if (!(objectTypes[typeof object])) return result', + 'loop': 'result.push(index)' + }); /** - * This method is like `_.isMatch` except that it accepts `customizer` which - * is invoked to compare values. If `customizer` returns `undefined` comparisons - * are handled by the method instead. The `customizer` is invoked with five - * arguments: (objValue, srcValue, index|key, object, source). + * Creates an array composed of the own enumerable property names of an object. * * @static * @memberOf _ - * @category Lang + * @category Objects * @param {Object} object The object to inspect. - * @param {Object} source The object of property values to match. - * @param {Function} [customizer] The function to customize comparisons. - * @returns {boolean} Returns `true` if `object` is a match, else `false`. + * @returns {Array} Returns an array of property names. * @example * - * function isGreeting(value) { - * return /^h(?:i|ello)$/.test(value); - * } - * - * function customizer(objValue, srcValue) { - * if (isGreeting(objValue) && isGreeting(srcValue)) { - * return true; - * } - * } - * - * var object = { 'greeting': 'hello' }; - * var source = { 'greeting': 'hi' }; + * _.keys({ 'one': 1, 'two': 2, 'three': 3 }); + * // => ['one', 'two', 'three'] (property order is not guaranteed across environments) + */ + var keys = !nativeKeys ? shimKeys : function(object) { + if (!isObject(object)) { + return []; + } + if ((support.enumPrototypes && typeof object == 'function') || + (support.nonEnumArgs && object.length && isArguments(object))) { + return shimKeys(object); + } + return nativeKeys(object); + }; + + /** Reusable iterator options shared by `each`, `forIn`, and `forOwn` */ + var eachIteratorOptions = { + 'args': 'collection, callback, thisArg', + 'top': "callback = callback && typeof thisArg == 'undefined' ? callback : baseCreateCallback(callback, thisArg, 3)", + 'array': "typeof length == 'number'", + 'keys': keys, + 'loop': 'if (callback(iterable[index], index, collection) === false) return result' + }; + + /** Reusable iterator options for `assign` and `defaults` */ + var defaultsIteratorOptions = { + 'args': 'object, source, guard', + 'top': + 'var args = arguments,\n' + + ' argsIndex = 0,\n' + + " argsLength = typeof guard == 'number' ? 2 : args.length;\n" + + 'while (++argsIndex < argsLength) {\n' + + ' iterable = args[argsIndex];\n' + + ' if (iterable && objectTypes[typeof iterable]) {', + 'keys': keys, + 'loop': "if (typeof result[index] == 'undefined') result[index] = iterable[index]", + 'bottom': ' }\n}' + }; + + /** Reusable iterator options for `forIn` and `forOwn` */ + var forOwnIteratorOptions = { + 'top': 'if (!objectTypes[typeof iterable]) return result;\n' + eachIteratorOptions.top, + 'array': false + }; + + /** + * Used to convert characters to HTML entities: * - * _.isMatchWith(object, source, customizer); - * // => true + * Though the `>` character is escaped for symmetry, characters like `>` and `/` + * don't require escaping in HTML and have no special meaning unless they're part + * of a tag or an unquoted attribute value. + * http://mathiasbynens.be/notes/ambiguous-ampersands (under "semi-related fun fact") */ - function isMatchWith(object, source, customizer) { - customizer = typeof customizer == 'function' ? customizer : undefined; - return baseIsMatch(object, source, getMatchData(source), customizer); - } + var htmlEscapes = { + '&': '&', + '<': '<', + '>': '>', + '"': '"', + "'": ''' + }; + + /** Used to convert HTML entities to characters */ + var htmlUnescapes = invert(htmlEscapes); + + /** Used to match HTML entities and HTML characters */ + var reEscapedHtml = RegExp('(' + keys(htmlUnescapes).join('|') + ')', 'g'), + reUnescapedHtml = RegExp('[' + keys(htmlEscapes).join('') + ']', 'g'); /** - * Checks if `value` is `NaN`. + * A function compiled to iterate `arguments` objects, arrays, objects, and + * strings consistenly across environments, executing the callback for each + * element in the collection. The callback is bound to `thisArg` and invoked + * with three arguments; (value, index|key, collection). Callbacks may exit + * iteration early by explicitly returning `false`. * - * **Note:** This method is not the same as [`isNaN`](https://es5.github.io/#x15.1.2.4) - * which returns `true` for `undefined` and other non-numeric values. + * @private + * @type Function + * @param {Array|Object|string} collection The collection to iterate over. + * @param {Function} [callback=identity] The function called per iteration. + * @param {*} [thisArg] The `this` binding of `callback`. + * @returns {Array|Object|string} Returns `collection`. + */ + var baseEach = createIterator(eachIteratorOptions); + + /*--------------------------------------------------------------------------*/ + + /** + * Assigns own enumerable properties of source object(s) to the destination + * object. Subsequent sources will overwrite property assignments of previous + * sources. If a callback is provided it will be executed to produce the + * assigned values. The callback is bound to `thisArg` and invoked with two + * arguments; (objectValue, sourceValue). * * @static * @memberOf _ - * @category Lang - * @param {*} value The value to check. - * @returns {boolean} Returns `true` if `value` is `NaN`, else `false`. + * @type Function + * @alias extend + * @category Objects + * @param {Object} object The destination object. + * @param {...Object} [source] The source objects. + * @param {Function} [callback] The function to customize assigning values. + * @param {*} [thisArg] The `this` binding of `callback`. + * @returns {Object} Returns the destination object. * @example * - * _.isNaN(NaN); - * // => true - * - * _.isNaN(new Number(NaN)); - * // => true + * _.assign({ 'name': 'fred' }, { 'employer': 'slate' }); + * // => { 'name': 'fred', 'employer': 'slate' } * - * isNaN(undefined); - * // => true + * var defaults = _.partialRight(_.assign, function(a, b) { + * return typeof a == 'undefined' ? b : a; + * }); * - * _.isNaN(undefined); - * // => false - */ - function isNaN(value) { - // An `NaN` primitive is the only value that is not equal to itself. - // Perform the `toStringTag` check first to avoid errors with some ActiveX objects in IE. - return isNumber(value) && value != +value; - } + * var object = { 'name': 'barney' }; + * defaults(object, { 'name': 'fred', 'employer': 'slate' }); + * // => { 'name': 'barney', 'employer': 'slate' } + */ + var assign = createIterator(defaultsIteratorOptions, { + 'top': + defaultsIteratorOptions.top.replace(';', + ';\n' + + "if (argsLength > 3 && typeof args[argsLength - 2] == 'function') {\n" + + ' var callback = baseCreateCallback(args[--argsLength - 1], args[argsLength--], 2);\n' + + "} else if (argsLength > 2 && typeof args[argsLength - 1] == 'function') {\n" + + ' callback = args[--argsLength];\n' + + '}' + ), + 'loop': 'result[index] = callback ? callback(result[index], iterable[index]) : iterable[index]' + }); /** - * Checks if `value` is a native function. + * Creates a clone of `value`. If `isDeep` is `true` nested objects will also + * be cloned, otherwise they will be assigned by reference. If a callback + * is provided it will be executed to produce the cloned values. If the + * callback returns `undefined` cloning will be handled by the method instead. + * The callback is bound to `thisArg` and invoked with one argument; (value). * * @static * @memberOf _ - * @category Lang - * @param {*} value The value to check. - * @returns {boolean} Returns `true` if `value` is a native function, else `false`. + * @category Objects + * @param {*} value The value to clone. + * @param {boolean} [isDeep=false] Specify a deep clone. + * @param {Function} [callback] The function to customize cloning values. + * @param {*} [thisArg] The `this` binding of `callback`. + * @returns {*} Returns the cloned value. * @example * - * _.isNative(Array.prototype.push); + * var characters = [ + * { 'name': 'barney', 'age': 36 }, + * { 'name': 'fred', 'age': 40 } + * ]; + * + * var shallow = _.clone(characters); + * shallow[0] === characters[0]; * // => true * - * _.isNative(_); + * var deep = _.clone(characters, true); + * deep[0] === characters[0]; * // => false + * + * _.mixin({ + * 'clone': _.partialRight(_.clone, function(value) { + * return _.isElement(value) ? value.cloneNode(false) : undefined; + * }) + * }); + * + * var clone = _.clone(document.body); + * clone.childNodes.length; + * // => 0 */ - function isNative(value) { - if (value == null) { - return false; - } - if (isFunction(value)) { - return reIsNative.test(funcToString.call(value)); + function clone(value, isDeep, callback, thisArg) { + // allows working with "Collections" methods without using their `index` + // and `collection` arguments for `isDeep` and `callback` + if (typeof isDeep != 'boolean' && isDeep != null) { + thisArg = callback; + callback = isDeep; + isDeep = false; } - return isObjectLike(value) && - (isHostObject(value) ? reIsNative : reIsHostCtor).test(value); + return baseClone(value, isDeep, typeof callback == 'function' && baseCreateCallback(callback, thisArg, 1)); } /** - * Checks if `value` is `null`. + * Creates a deep clone of `value`. If a callback is provided it will be + * executed to produce the cloned values. If the callback returns `undefined` + * cloning will be handled by the method instead. The callback is bound to + * `thisArg` and invoked with one argument; (value). + * + * Note: This method is loosely based on the structured clone algorithm. Functions + * and DOM nodes are **not** cloned. The enumerable properties of `arguments` objects and + * objects created by constructors other than `Object` are cloned to plain `Object` objects. + * See http://www.w3.org/TR/html5/infrastructure.html#internal-structured-cloning-algorithm. * * @static * @memberOf _ - * @category Lang - * @param {*} value The value to check. - * @returns {boolean} Returns `true` if `value` is `null`, else `false`. + * @category Objects + * @param {*} value The value to deep clone. + * @param {Function} [callback] The function to customize cloning values. + * @param {*} [thisArg] The `this` binding of `callback`. + * @returns {*} Returns the deep cloned value. * @example * - * _.isNull(null); - * // => true + * var characters = [ + * { 'name': 'barney', 'age': 36 }, + * { 'name': 'fred', 'age': 40 } + * ]; + * + * var deep = _.cloneDeep(characters); + * deep[0] === characters[0]; + * // => false + * + * var view = { + * 'label': 'docs', + * 'node': element + * }; + * + * var clone = _.cloneDeep(view, function(value) { + * return _.isElement(value) ? value.cloneNode(true) : undefined; + * }); * - * _.isNull(void 0); + * clone.node == view.node; * // => false */ - function isNull(value) { - return value === null; + function cloneDeep(value, callback, thisArg) { + return baseClone(value, true, typeof callback == 'function' && baseCreateCallback(callback, thisArg, 1)); } /** - * Checks if `value` is `null` or `undefined`. + * Creates an object that inherits from the given `prototype` object. If a + * `properties` object is provided its own enumerable properties are assigned + * to the created object. * * @static * @memberOf _ - * @category Lang - * @param {*} value The value to check. - * @returns {boolean} Returns `true` if `value` is nullish, else `false`. + * @category Objects + * @param {Object} prototype The object to inherit from. + * @param {Object} [properties] The properties to assign to the object. + * @returns {Object} Returns the new object. * @example * - * _.isNil(null); - * // => true + * function Shape() { + * this.x = 0; + * this.y = 0; + * } * - * _.isNil(void 0); + * function Circle() { + * Shape.call(this); + * } + * + * Circle.prototype = _.create(Shape.prototype, { 'constructor': Circle }); + * + * var circle = new Circle; + * circle instanceof Circle; * // => true * - * _.isNil(NaN); - * // => false + * circle instanceof Shape; + * // => true */ - function isNil(value) { - return value == null; + function create(prototype, properties) { + var result = baseCreate(prototype); + return properties ? assign(result, properties) : result; } /** - * Checks if `value` is classified as a `Number` primitive or object. - * - * **Note:** To exclude `Infinity`, `-Infinity`, and `NaN`, which are classified - * as numbers, use the `_.isFinite` method. + * Assigns own enumerable properties of source object(s) to the destination + * object for all destination properties that resolve to `undefined`. Once a + * property is set, additional defaults of the same property will be ignored. * * @static * @memberOf _ - * @category Lang - * @param {*} value The value to check. - * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`. + * @type Function + * @category Objects + * @param {Object} object The destination object. + * @param {...Object} [source] The source objects. + * @param- {Object} [guard] Allows working with `_.reduce` without using its + * `key` and `object` arguments as sources. + * @returns {Object} Returns the destination object. * @example * - * _.isNumber(3); - * // => true - * - * _.isNumber(Number.MIN_VALUE); - * // => true - * - * _.isNumber(Infinity); - * // => true - * - * _.isNumber('3'); - * // => false + * var object = { 'name': 'barney' }; + * _.defaults(object, { 'name': 'fred', 'employer': 'slate' }); + * // => { 'name': 'barney', 'employer': 'slate' } */ - function isNumber(value) { - return typeof value == 'number' || - (isObjectLike(value) && objectToString.call(value) == numberTag); - } + var defaults = createIterator(defaultsIteratorOptions); /** - * Checks if `value` is a plain object, that is, an object created by the - * `Object` constructor or one with a `[[Prototype]]` of `null`. + * This method is like `_.findIndex` except that it returns the key of the + * first element that passes the callback check, instead of the element itself. + * + * If a property name is provided for `callback` the created "_.pluck" style + * callback will return the property value of the given element. + * + * If an object is provided for `callback` the created "_.where" style callback + * will return `true` for elements that have the properties of the given object, + * else `false`. * * @static * @memberOf _ - * @category Lang - * @param {*} value The value to check. - * @returns {boolean} Returns `true` if `value` is a plain object, else `false`. + * @category Objects + * @param {Object} object The object to search. + * @param {Function|Object|string} [callback=identity] The function called per + * iteration. If a property name or object is provided it will be used to + * create a "_.pluck" or "_.where" style callback, respectively. + * @param {*} [thisArg] The `this` binding of `callback`. + * @returns {string|undefined} Returns the key of the found element, else `undefined`. * @example * - * function Foo() { - * this.a = 1; - * } - * - * _.isPlainObject(new Foo); - * // => false + * var characters = { + * 'barney': { 'age': 36, 'blocked': false }, + * 'fred': { 'age': 40, 'blocked': true }, + * 'pebbles': { 'age': 1, 'blocked': false } + * }; * - * _.isPlainObject([1, 2, 3]); - * // => false + * _.findKey(characters, function(chr) { + * return chr.age < 40; + * }); + * // => 'barney' (property order is not guaranteed across environments) * - * _.isPlainObject({ 'x': 0, 'y': 0 }); - * // => true + * // using "_.where" callback shorthand + * _.findKey(characters, { 'age': 1 }); + * // => 'pebbles' * - * _.isPlainObject(Object.create(null)); - * // => true + * // using "_.pluck" callback shorthand + * _.findKey(characters, 'blocked'); + * // => 'fred' */ - function isPlainObject(value) { - if (!isObjectLike(value) || - objectToString.call(value) != objectTag || isHostObject(value)) { - return false; - } - var proto = getPrototypeOf(value); - if (proto === null) { - return true; - } - var Ctor = proto.constructor; - return (typeof Ctor == 'function' && - Ctor instanceof Ctor && funcToString.call(Ctor) == objectCtorString); + function findKey(object, callback, thisArg) { + var result; + callback = lodash.createCallback(callback, thisArg, 3); + forOwn(object, function(value, key, object) { + if (callback(value, key, object)) { + result = key; + return false; + } + }); + return result; } /** - * Checks if `value` is classified as a `RegExp` object. + * This method is like `_.findKey` except that it iterates over elements + * of a `collection` in the opposite order. + * + * If a property name is provided for `callback` the created "_.pluck" style + * callback will return the property value of the given element. + * + * If an object is provided for `callback` the created "_.where" style callback + * will return `true` for elements that have the properties of the given object, + * else `false`. * * @static * @memberOf _ - * @category Lang - * @param {*} value The value to check. - * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`. + * @category Objects + * @param {Object} object The object to search. + * @param {Function|Object|string} [callback=identity] The function called per + * iteration. If a property name or object is provided it will be used to + * create a "_.pluck" or "_.where" style callback, respectively. + * @param {*} [thisArg] The `this` binding of `callback`. + * @returns {string|undefined} Returns the key of the found element, else `undefined`. * @example * - * _.isRegExp(/abc/); - * // => true + * var characters = { + * 'barney': { 'age': 36, 'blocked': true }, + * 'fred': { 'age': 40, 'blocked': false }, + * 'pebbles': { 'age': 1, 'blocked': true } + * }; * - * _.isRegExp('/abc/'); - * // => false + * _.findLastKey(characters, function(chr) { + * return chr.age < 40; + * }); + * // => returns `pebbles`, assuming `_.findKey` returns `barney` + * + * // using "_.where" callback shorthand + * _.findLastKey(characters, { 'age': 40 }); + * // => 'fred' + * + * // using "_.pluck" callback shorthand + * _.findLastKey(characters, 'blocked'); + * // => 'pebbles' */ - function isRegExp(value) { - return isObject(value) && objectToString.call(value) == regexpTag; + function findLastKey(object, callback, thisArg) { + var result; + callback = lodash.createCallback(callback, thisArg, 3); + forOwnRight(object, function(value, key, object) { + if (callback(value, key, object)) { + result = key; + return false; + } + }); + return result; } /** - * Checks if `value` is a safe integer. An integer is safe if it's an IEEE-754 - * double precision number which isn't the result of a rounded unsafe integer. - * - * **Note:** This method is based on [`Number.isSafeInteger`](https://mdn.io/Number/isSafeInteger). + * Iterates over own and inherited enumerable properties of an object, + * executing the callback for each property. The callback is bound to `thisArg` + * and invoked with three arguments; (value, key, object). Callbacks may exit + * iteration early by explicitly returning `false`. * * @static * @memberOf _ - * @category Lang - * @param {*} value The value to check. - * @returns {boolean} Returns `true` if `value` is a safe integer, else `false`. + * @type Function + * @category Objects + * @param {Object} object The object to iterate over. + * @param {Function} [callback=identity] The function called per iteration. + * @param {*} [thisArg] The `this` binding of `callback`. + * @returns {Object} Returns `object`. * @example * - * _.isSafeInteger(3); - * // => true - * - * _.isSafeInteger(Number.MIN_VALUE); - * // => false + * function Shape() { + * this.x = 0; + * this.y = 0; + * } * - * _.isSafeInteger(Infinity); - * // => false + * Shape.prototype.move = function(x, y) { + * this.x += x; + * this.y += y; + * }; * - * _.isSafeInteger('3'); - * // => false + * _.forIn(new Shape, function(value, key) { + * console.log(key); + * }); + * // => logs 'x', 'y', and 'move' (property order is not guaranteed across environments) */ - function isSafeInteger(value) { - return isInteger(value) && value >= -MAX_SAFE_INTEGER && value <= MAX_SAFE_INTEGER; - } + var forIn = createIterator(eachIteratorOptions, forOwnIteratorOptions, { + 'useHas': false + }); /** - * Checks if `value` is classified as a `Set` object. + * This method is like `_.forIn` except that it iterates over elements + * of a `collection` in the opposite order. * * @static * @memberOf _ - * @category Lang - * @param {*} value The value to check. - * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`. + * @category Objects + * @param {Object} object The object to iterate over. + * @param {Function} [callback=identity] The function called per iteration. + * @param {*} [thisArg] The `this` binding of `callback`. + * @returns {Object} Returns `object`. * @example * - * _.isSet(new Set); - * // => true + * function Shape() { + * this.x = 0; + * this.y = 0; + * } * - * _.isSet(new WeakSet); - * // => false + * Shape.prototype.move = function(x, y) { + * this.x += x; + * this.y += y; + * }; + * + * _.forInRight(new Shape, function(value, key) { + * console.log(key); + * }); + * // => logs 'move', 'y', and 'x' assuming `_.forIn ` logs 'x', 'y', and 'move' */ - function isSet(value) { - return isObjectLike(value) && getTag(value) == setTag; + function forInRight(object, callback, thisArg) { + var pairs = []; + + forIn(object, function(value, key) { + pairs.push(key, value); + }); + + var length = pairs.length; + callback = baseCreateCallback(callback, thisArg, 3); + while (length--) { + if (callback(pairs[length--], pairs[length], object) === false) { + break; + } + } + return object; } /** - * Checks if `value` is classified as a `String` primitive or object. + * Iterates over own enumerable properties of an object, executing the callback + * for each property. The callback is bound to `thisArg` and invoked with three + * arguments; (value, key, object). Callbacks may exit iteration early by + * explicitly returning `false`. * * @static * @memberOf _ - * @category Lang - * @param {*} value The value to check. - * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`. + * @type Function + * @category Objects + * @param {Object} object The object to iterate over. + * @param {Function} [callback=identity] The function called per iteration. + * @param {*} [thisArg] The `this` binding of `callback`. + * @returns {Object} Returns `object`. * @example * - * _.isString('abc'); - * // => true - * - * _.isString(1); - * // => false + * _.forOwn({ '0': 'zero', '1': 'one', 'length': 2 }, function(num, key) { + * console.log(key); + * }); + * // => logs '0', '1', and 'length' (property order is not guaranteed across environments) */ - function isString(value) { - return typeof value == 'string' || - (!isArray(value) && isObjectLike(value) && objectToString.call(value) == stringTag); - } + var forOwn = createIterator(eachIteratorOptions, forOwnIteratorOptions); /** - * Checks if `value` is classified as a `Symbol` primitive or object. + * This method is like `_.forOwn` except that it iterates over elements + * of a `collection` in the opposite order. * * @static * @memberOf _ - * @category Lang - * @param {*} value The value to check. - * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`. + * @category Objects + * @param {Object} object The object to iterate over. + * @param {Function} [callback=identity] The function called per iteration. + * @param {*} [thisArg] The `this` binding of `callback`. + * @returns {Object} Returns `object`. * @example * - * _.isSymbol(Symbol.iterator); - * // => true - * - * _.isSymbol('abc'); - * // => false + * _.forOwnRight({ '0': 'zero', '1': 'one', 'length': 2 }, function(num, key) { + * console.log(key); + * }); + * // => logs 'length', '1', and '0' assuming `_.forOwn` logs '0', '1', and 'length' */ - function isSymbol(value) { - return typeof value == 'symbol' || - (isObjectLike(value) && objectToString.call(value) == symbolTag); + function forOwnRight(object, callback, thisArg) { + var props = keys(object), + length = props.length; + + callback = baseCreateCallback(callback, thisArg, 3); + while (length--) { + var key = props[length]; + if (callback(object[key], key, object) === false) { + break; + } + } + return object; } /** - * Checks if `value` is classified as a typed array. + * Creates a sorted array of property names of all enumerable properties, + * own and inherited, of `object` that have function values. * * @static * @memberOf _ - * @category Lang - * @param {*} value The value to check. - * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`. + * @alias methods + * @category Objects + * @param {Object} object The object to inspect. + * @returns {Array} Returns an array of property names that have function values. * @example * - * _.isTypedArray(new Uint8Array); - * // => true - * - * _.isTypedArray([]); - * // => false + * _.functions(_); + * // => ['all', 'any', 'bind', 'bindAll', 'clone', 'compact', 'compose', ...] */ - function isTypedArray(value) { - return isObjectLike(value) && - isLength(value.length) && !!typedArrayTags[objectToString.call(value)]; + function functions(object) { + var result = []; + forIn(object, function(value, key) { + if (isFunction(value)) { + result.push(key); + } + }); + return result.sort(); } /** - * Checks if `value` is `undefined`. + * Checks if the specified property name exists as a direct property of `object`, + * instead of an inherited property. * * @static * @memberOf _ - * @category Lang - * @param {*} value The value to check. - * @returns {boolean} Returns `true` if `value` is `undefined`, else `false`. + * @category Objects + * @param {Object} object The object to inspect. + * @param {string} key The name of the property to check. + * @returns {boolean} Returns `true` if key is a direct property, else `false`. * @example * - * _.isUndefined(void 0); + * _.has({ 'a': 1, 'b': 2, 'c': 3 }, 'b'); * // => true - * - * _.isUndefined(null); - * // => false */ - function isUndefined(value) { - return value === undefined; + function has(object, key) { + return object ? hasOwnProperty.call(object, key) : false; } /** - * Checks if `value` is classified as a `WeakMap` object. + * Creates an object composed of the inverted keys and values of the given object. * * @static * @memberOf _ - * @category Lang - * @param {*} value The value to check. - * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`. + * @category Objects + * @param {Object} object The object to invert. + * @returns {Object} Returns the created inverted object. * @example * - * _.isWeakMap(new WeakMap); - * // => true - * - * _.isWeakMap(new Map); - * // => false + * _.invert({ 'first': 'fred', 'second': 'barney' }); + * // => { 'fred': 'first', 'barney': 'second' } */ - function isWeakMap(value) { - return isObjectLike(value) && getTag(value) == weakMapTag; + function invert(object) { + var index = -1, + props = keys(object), + length = props.length, + result = {}; + + while (++index < length) { + var key = props[index]; + result[object[key]] = key; + } + return result; } /** - * Checks if `value` is classified as a `WeakSet` object. + * Checks if `value` is a boolean value. * * @static * @memberOf _ - * @category Lang + * @category Objects * @param {*} value The value to check. - * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`. + * @returns {boolean} Returns `true` if the `value` is a boolean value, else `false`. * @example * - * _.isWeakSet(new WeakSet); - * // => true - * - * _.isWeakSet(new Set); + * _.isBoolean(null); * // => false */ - function isWeakSet(value) { - return isObjectLike(value) && objectToString.call(value) == weakSetTag; + function isBoolean(value) { + return value === true || value === false || + value && typeof value == 'object' && toString.call(value) == boolClass || false; } /** - * Checks if `value` is less than `other`. + * Checks if `value` is a date. * * @static * @memberOf _ - * @category Lang - * @param {*} value The value to compare. - * @param {*} other The other value to compare. - * @returns {boolean} Returns `true` if `value` is less than `other`, else `false`. + * @category Objects + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if the `value` is a date, else `false`. * @example * - * _.lt(1, 3); + * _.isDate(new Date); * // => true - * - * _.lt(3, 3); - * // => false - * - * _.lt(3, 1); - * // => false */ - function lt(value, other) { - return value < other; + function isDate(value) { + return value && typeof value == 'object' && toString.call(value) == dateClass || false; } /** - * Checks if `value` is less than or equal to `other`. + * Checks if `value` is a DOM element. * * @static * @memberOf _ - * @category Lang - * @param {*} value The value to compare. - * @param {*} other The other value to compare. - * @returns {boolean} Returns `true` if `value` is less than or equal to `other`, else `false`. + * @category Objects + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if the `value` is a DOM element, else `false`. * @example * - * _.lte(1, 3); - * // => true - * - * _.lte(3, 3); + * _.isElement(document.body); * // => true - * - * _.lte(3, 1); - * // => false */ - function lte(value, other) { - return value <= other; + function isElement(value) { + return value && value.nodeType === 1 || false; } /** - * Converts `value` to an array. + * Checks if `value` is empty. Arrays, strings, or `arguments` objects with a + * length of `0` and objects with no own enumerable properties are considered + * "empty". * * @static * @memberOf _ - * @category Lang - * @param {*} value The value to convert. - * @returns {Array} Returns the converted array. + * @category Objects + * @param {Array|Object|string} value The value to inspect. + * @returns {boolean} Returns `true` if the `value` is empty, else `false`. * @example * - * _.toArray({ 'a': 1, 'b': 2 }); - * // => [1, 2] - * - * _.toArray('abc'); - * // => ['a', 'b', 'c'] + * _.isEmpty([1, 2, 3]); + * // => false * - * _.toArray(1); - * // => [] + * _.isEmpty({}); + * // => true * - * _.toArray(null); - * // => [] + * _.isEmpty(''); + * // => true */ - function toArray(value) { + function isEmpty(value) { + var result = true; if (!value) { - return []; - } - if (isArrayLike(value)) { - return isString(value) ? stringToArray(value) : copyArray(value); - } - if (iteratorSymbol && value[iteratorSymbol]) { - return iteratorToArray(value[iteratorSymbol]()); + return result; } - var tag = getTag(value), - func = tag == mapTag ? mapToArray : (tag == setTag ? setToArray : values); + var className = toString.call(value), + length = value.length; - return func(value); + if ((className == arrayClass || className == stringClass || + (support.argsClass ? className == argsClass : isArguments(value))) || + (className == objectClass && typeof length == 'number' && isFunction(value.splice))) { + return !length; + } + forOwn(value, function() { + return (result = false); + }); + return result; } /** - * Converts `value` to an integer. - * - * **Note:** This function is loosely based on [`ToInteger`](http://www.ecma-international.org/ecma-262/6.0/#sec-tointeger). + * Performs a deep comparison between two values to determine if they are + * equivalent to each other. If a callback is provided it will be executed + * to compare values. If the callback returns `undefined` comparisons will + * be handled by the method instead. The callback is bound to `thisArg` and + * invoked with two arguments; (a, b). * * @static * @memberOf _ - * @category Lang - * @param {*} value The value to convert. - * @returns {number} Returns the converted integer. + * @category Objects + * @param {*} a The value to compare. + * @param {*} b The other value to compare. + * @param {Function} [callback] The function to customize comparing values. + * @param {*} [thisArg] The `this` binding of `callback`. + * @returns {boolean} Returns `true` if the values are equivalent, else `false`. * @example * - * _.toInteger(3); - * // => 3 + * var object = { 'name': 'fred' }; + * var copy = { 'name': 'fred' }; * - * _.toInteger(Number.MIN_VALUE); - * // => 0 + * object == copy; + * // => false + * + * _.isEqual(object, copy); + * // => true * - * _.toInteger(Infinity); - * // => 1.7976931348623157e+308 + * var words = ['hello', 'goodbye']; + * var otherWords = ['hi', 'goodbye']; * - * _.toInteger('3'); - * // => 3 + * _.isEqual(words, otherWords, function(a, b) { + * var reGreet = /^(?:hello|hi)$/i, + * aGreet = _.isString(a) && reGreet.test(a), + * bGreet = _.isString(b) && reGreet.test(b); + * + * return (aGreet || bGreet) ? (aGreet == bGreet) : undefined; + * }); + * // => true */ - function toInteger(value) { - if (!value) { - return value === 0 ? value : 0; - } - value = toNumber(value); - if (value === INFINITY || value === -INFINITY) { - var sign = (value < 0 ? -1 : 1); - return sign * MAX_INTEGER; - } - var remainder = value % 1; - return value === value ? (remainder ? value - remainder : value) : 0; + function isEqual(a, b, callback, thisArg) { + return baseIsEqual(a, b, typeof callback == 'function' && baseCreateCallback(callback, thisArg, 2)); } /** - * Converts `value` to an integer suitable for use as the length of an - * array-like object. + * Checks if `value` is, or can be coerced to, a finite number. * - * **Note:** This method is based on [`ToLength`](http://ecma-international.org/ecma-262/6.0/#sec-tolength). + * Note: This is not the same as native `isFinite` which will return true for + * booleans and empty strings. See http://es5.github.io/#x15.1.2.5. * * @static * @memberOf _ - * @category Lang - * @param {*} value The value to convert. - * @returns {number} Returns the converted integer. + * @category Objects + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if the `value` is finite, else `false`. * @example * - * _.toLength(3); - * // => 3 + * _.isFinite(-101); + * // => true * - * _.toLength(Number.MIN_VALUE); - * // => 0 + * _.isFinite('10'); + * // => true * - * _.toLength(Infinity); - * // => 4294967295 + * _.isFinite(true); + * // => false * - * _.toLength('3'); - * // => 3 + * _.isFinite(''); + * // => false + * + * _.isFinite(Infinity); + * // => false */ - function toLength(value) { - return value ? baseClamp(toInteger(value), 0, MAX_ARRAY_LENGTH) : 0; + function isFinite(value) { + return nativeIsFinite(value) && !nativeIsNaN(parseFloat(value)); } /** - * Converts `value` to a number. + * Checks if `value` is a function. * * @static * @memberOf _ - * @category Lang - * @param {*} value The value to process. - * @returns {number} Returns the number. + * @category Objects + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if the `value` is a function, else `false`. * @example * - * _.toNumber(3); - * // => 3 - * - * _.toNumber(Number.MIN_VALUE); - * // => 5e-324 - * - * _.toNumber(Infinity); - * // => Infinity - * - * _.toNumber('3'); - * // => 3 + * _.isFunction(_); + * // => true */ - function toNumber(value) { - if (isObject(value)) { - var other = isFunction(value.valueOf) ? value.valueOf() : value; - value = isObject(other) ? (other + '') : other; - } - if (typeof value != 'string') { - return value === 0 ? value : +value; - } - value = value.replace(reTrim, ''); - var isBinary = reIsBinary.test(value); - return (isBinary || reIsOctal.test(value)) - ? freeParseInt(value.slice(2), isBinary ? 2 : 8) - : (reIsBadHex.test(value) ? NAN : +value); + function isFunction(value) { + return typeof value == 'function'; + } + // fallback for older versions of Chrome and Safari + if (isFunction(/x/)) { + isFunction = function(value) { + return typeof value == 'function' && toString.call(value) == funcClass; + }; } /** - * Converts `value` to a plain object flattening inherited enumerable - * properties of `value` to own properties of the plain object. + * Checks if `value` is the language type of Object. + * (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`) * * @static * @memberOf _ - * @category Lang - * @param {*} value The value to convert. - * @returns {Object} Returns the converted plain object. + * @category Objects + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if the `value` is an object, else `false`. * @example * - * function Foo() { - * this.b = 2; - * } - * - * Foo.prototype.c = 3; + * _.isObject({}); + * // => true * - * _.assign({ 'a': 1 }, new Foo); - * // => { 'a': 1, 'b': 2 } + * _.isObject([1, 2, 3]); + * // => true * - * _.assign({ 'a': 1 }, _.toPlainObject(new Foo)); - * // => { 'a': 1, 'b': 2, 'c': 3 } + * _.isObject(1); + * // => false */ - function toPlainObject(value) { - return copyObject(value, keysIn(value)); + function isObject(value) { + // check if the value is the ECMAScript language type of Object + // http://es5.github.io/#x8 + // and avoid a V8 bug + // http://code.google.com/p/v8/issues/detail?id=2291 + return !!(value && objectTypes[typeof value]); } /** - * Converts `value` to a safe integer. A safe integer can be compared and - * represented correctly. + * Checks if `value` is `NaN`. + * + * Note: This is not the same as native `isNaN` which will return `true` for + * `undefined` and other non-numeric values. See http://es5.github.io/#x15.1.2.4. * * @static * @memberOf _ - * @category Lang - * @param {*} value The value to convert. - * @returns {number} Returns the converted integer. + * @category Objects + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if the `value` is `NaN`, else `false`. * @example * - * _.toSafeInteger(3); - * // => 3 + * _.isNaN(NaN); + * // => true * - * _.toSafeInteger(Number.MIN_VALUE); - * // => 0 + * _.isNaN(new Number(NaN)); + * // => true * - * _.toSafeInteger(Infinity); - * // => 9007199254740991 + * isNaN(undefined); + * // => true * - * _.toSafeInteger('3'); - * // => 3 + * _.isNaN(undefined); + * // => false */ - function toSafeInteger(value) { - return baseClamp(toInteger(value), -MAX_SAFE_INTEGER, MAX_SAFE_INTEGER); + function isNaN(value) { + // `NaN` as a primitive is the only value that is not equal to itself + // (perform the [[Class]] check first to avoid errors with some host objects in IE) + return isNumber(value) && value != +value; } /** - * Converts `value` to a string if it's not one. An empty string is returned - * for `null` and `undefined` values. The sign of `-0` is preserved. + * Checks if `value` is `null`. * * @static * @memberOf _ - * @category Lang - * @param {*} value The value to process. - * @returns {string} Returns the string. + * @category Objects + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if the `value` is `null`, else `false`. * @example * - * _.toString(null); - * // => '' - * - * _.toString(-0); - * // => '-0' + * _.isNull(null); + * // => true * - * _.toString([1, 2, 3]); - * // => '1,2,3' + * _.isNull(undefined); + * // => false */ - function toString(value) { - // Exit early for strings to avoid a performance hit in some environments. - if (typeof value == 'string') { - return value; - } - if (value == null) { - return ''; - } - if (isSymbol(value)) { - return symbolToString ? symbolToString.call(value) : ''; - } - var result = (value + ''); - return (result == '0' && (1 / value) == -INFINITY) ? '-0' : result; + function isNull(value) { + return value === null; } - /*------------------------------------------------------------------------*/ - /** - * Assigns own enumerable properties of source objects to the destination - * object. Source objects are applied from left to right. Subsequent sources - * overwrite property assignments of previous sources. + * Checks if `value` is a number. * - * **Note:** This method mutates `object` and is loosely based on - * [`Object.assign`](https://mdn.io/Object/assign). + * Note: `NaN` is considered a number. See http://es5.github.io/#x8.5. * * @static * @memberOf _ - * @category Object - * @param {Object} object The destination object. - * @param {...Object} [sources] The source objects. - * @returns {Object} Returns `object`. + * @category Objects + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if the `value` is a number, else `false`. * @example * - * function Foo() { - * this.c = 3; - * } - * - * function Bar() { - * this.e = 5; - * } - * - * Foo.prototype.d = 4; - * Bar.prototype.f = 6; - * - * _.assign({ 'a': 1 }, new Foo, new Bar); - * // => { 'a': 1, 'c': 3, 'e': 5 } + * _.isNumber(8.4 * 5); + * // => true */ - var assign = createAssigner(function(object, source) { - if (nonEnumShadows || isPrototype(source) || isArrayLike(source)) { - copyObject(source, keys(source), object); - return; - } - for (var key in source) { - if (hasOwnProperty.call(source, key)) { - assignValue(object, key, source[key]); - } - } - }); + function isNumber(value) { + return typeof value == 'number' || + value && typeof value == 'object' && toString.call(value) == numberClass || false; + } /** - * This method is like `_.assign` except that it iterates over own and - * inherited source properties. - * - * **Note:** This method mutates `object`. + * Checks if `value` is an object created by the `Object` constructor. * * @static * @memberOf _ - * @alias extend - * @category Object - * @param {Object} object The destination object. - * @param {...Object} [sources] The source objects. - * @returns {Object} Returns `object`. + * @category Objects + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a plain object, else `false`. * @example * - * function Foo() { - * this.b = 2; + * function Shape() { + * this.x = 0; + * this.y = 0; * } * - * function Bar() { - * this.d = 4; - * } + * _.isPlainObject(new Shape); + * // => false * - * Foo.prototype.c = 3; - * Bar.prototype.e = 5; + * _.isPlainObject([1, 2, 3]); + * // => false * - * _.assignIn({ 'a': 1 }, new Foo, new Bar); - * // => { 'a': 1, 'b': 2, 'c': 3, 'd': 4, 'e': 5 } + * _.isPlainObject({ 'x': 0, 'y': 0 }); + * // => true */ - var assignIn = createAssigner(function(object, source) { - if (nonEnumShadows || isPrototype(source) || isArrayLike(source)) { - copyObject(source, keysIn(source), object); - return; - } - for (var key in source) { - assignValue(object, key, source[key]); + var isPlainObject = !getPrototypeOf ? shimIsPlainObject : function(value) { + if (!(value && toString.call(value) == objectClass) || (!support.argsClass && isArguments(value))) { + return false; } - }); + var valueOf = value.valueOf, + objProto = isNative(valueOf) && (objProto = getPrototypeOf(valueOf)) && getPrototypeOf(objProto); + + return objProto + ? (value == objProto || getPrototypeOf(value) == objProto) + : shimIsPlainObject(value); + }; /** - * This method is like `_.assignIn` except that it accepts `customizer` which - * is invoked to produce the assigned values. If `customizer` returns `undefined` - * assignment is handled by the method instead. The `customizer` is invoked - * with five arguments: (objValue, srcValue, key, object, source). - * - * **Note:** This method mutates `object`. + * Checks if `value` is a regular expression. * * @static * @memberOf _ - * @alias extendWith - * @category Object - * @param {Object} object The destination object. - * @param {...Object} sources The source objects. - * @param {Function} [customizer] The function to customize assigned values. - * @returns {Object} Returns `object`. + * @category Objects + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if the `value` is a regular expression, else `false`. * @example * - * function customizer(objValue, srcValue) { - * return _.isUndefined(objValue) ? srcValue : objValue; - * } - * - * var defaults = _.partialRight(_.assignInWith, customizer); - * - * defaults({ 'a': 1 }, { 'b': 2 }, { 'a': 3 }); - * // => { 'a': 1, 'b': 2 } + * _.isRegExp(/fred/); + * // => true */ - var assignInWith = createAssigner(function(object, source, srcIndex, customizer) { - copyObjectWith(source, keysIn(source), object, customizer); - }); + function isRegExp(value) { + return value && objectTypes[typeof value] && toString.call(value) == regexpClass || false; + } /** - * This method is like `_.assign` except that it accepts `customizer` which - * is invoked to produce the assigned values. If `customizer` returns `undefined` - * assignment is handled by the method instead. The `customizer` is invoked - * with five arguments: (objValue, srcValue, key, object, source). - * - * **Note:** This method mutates `object`. + * Checks if `value` is a string. * * @static * @memberOf _ - * @category Object - * @param {Object} object The destination object. - * @param {...Object} sources The source objects. - * @param {Function} [customizer] The function to customize assigned values. - * @returns {Object} Returns `object`. + * @category Objects + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if the `value` is a string, else `false`. * @example * - * function customizer(objValue, srcValue) { - * return _.isUndefined(objValue) ? srcValue : objValue; - * } + * _.isString('fred'); + * // => true + */ + function isString(value) { + return typeof value == 'string' || + value && typeof value == 'object' && toString.call(value) == stringClass || false; + } + + /** + * Checks if `value` is `undefined`. * - * var defaults = _.partialRight(_.assignWith, customizer); + * @static + * @memberOf _ + * @category Objects + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if the `value` is `undefined`, else `false`. + * @example * - * defaults({ 'a': 1 }, { 'b': 2 }, { 'a': 3 }); - * // => { 'a': 1, 'b': 2 } + * _.isUndefined(void 0); + * // => true */ - var assignWith = createAssigner(function(object, source, srcIndex, customizer) { - copyObjectWith(source, keys(source), object, customizer); - }); + function isUndefined(value) { + return typeof value == 'undefined'; + } /** - * Creates an array of values corresponding to `paths` of `object`. + * Creates an object with the same keys as `object` and values generated by + * running each own enumerable property of `object` through the callback. + * The callback is bound to `thisArg` and invoked with three arguments; + * (value, key, object). + * + * If a property name is provided for `callback` the created "_.pluck" style + * callback will return the property value of the given element. + * + * If an object is provided for `callback` the created "_.where" style callback + * will return `true` for elements that have the properties of the given object, + * else `false`. * * @static * @memberOf _ - * @category Object + * @category Objects * @param {Object} object The object to iterate over. - * @param {...(string|string[])} [paths] The property paths of elements to pick, - * specified individually or in arrays. - * @returns {Array} Returns the new array of picked elements. + * @param {Function|Object|string} [callback=identity] The function called + * per iteration. If a property name or object is provided it will be used + * to create a "_.pluck" or "_.where" style callback, respectively. + * @param {*} [thisArg] The `this` binding of `callback`. + * @returns {Array} Returns a new object with values of the results of each `callback` execution. * @example * - * var object = { 'a': [{ 'b': { 'c': 3 } }, 4] }; + * _.mapValues({ 'a': 1, 'b': 2, 'c': 3} , function(num) { return num * 3; }); + * // => { 'a': 3, 'b': 6, 'c': 9 } * - * _.at(object, ['a[0].b.c', 'a[1]']); - * // => [3, 4] + * var characters = { + * 'fred': { 'name': 'fred', 'age': 40 }, + * 'pebbles': { 'name': 'pebbles', 'age': 1 } + * }; * - * _.at(['a', 'b', 'c'], 0, 2); - * // => ['a', 'c'] + * // using "_.pluck" callback shorthand + * _.mapValues(characters, 'age'); + * // => { 'fred': 40, 'pebbles': 1 } */ - var at = rest(function(object, paths) { - return baseAt(object, baseFlatten(paths, 1)); - }); + function mapValues(object, callback, thisArg) { + var result = {}; + callback = lodash.createCallback(callback, thisArg, 3); + + forOwn(object, function(value, key, object) { + result[key] = callback(value, key, object); + }); + return result; + } /** - * Creates an object that inherits from the `prototype` object. If a `properties` - * object is given its own enumerable properties are assigned to the created object. + * Recursively merges own enumerable properties of the source object(s), that + * don't resolve to `undefined` into the destination object. Subsequent sources + * will overwrite property assignments of previous sources. If a callback is + * provided it will be executed to produce the merged values of the destination + * and source properties. If the callback returns `undefined` merging will + * be handled by the method instead. The callback is bound to `thisArg` and + * invoked with two arguments; (objectValue, sourceValue). * * @static * @memberOf _ - * @category Object - * @param {Object} prototype The object to inherit from. - * @param {Object} [properties] The properties to assign to the object. - * @returns {Object} Returns the new object. + * @category Objects + * @param {Object} object The destination object. + * @param {...Object} [source] The source objects. + * @param {Function} [callback] The function to customize merging properties. + * @param {*} [thisArg] The `this` binding of `callback`. + * @returns {Object} Returns the destination object. * @example * - * function Shape() { - * this.x = 0; - * this.y = 0; - * } + * var names = { + * 'characters': [ + * { 'name': 'barney' }, + * { 'name': 'fred' } + * ] + * }; * - * function Circle() { - * Shape.call(this); - * } + * var ages = { + * 'characters': [ + * { 'age': 36 }, + * { 'age': 40 } + * ] + * }; * - * Circle.prototype = _.create(Shape.prototype, { - * 'constructor': Circle - * }); + * _.merge(names, ages); + * // => { 'characters': [{ 'name': 'barney', 'age': 36 }, { 'name': 'fred', 'age': 40 }] } * - * var circle = new Circle; - * circle instanceof Circle; - * // => true + * var food = { + * 'fruits': ['apple'], + * 'vegetables': ['beet'] + * }; * - * circle instanceof Shape; - * // => true + * var otherFood = { + * 'fruits': ['banana'], + * 'vegetables': ['carrot'] + * }; + * + * _.merge(food, otherFood, function(a, b) { + * return _.isArray(a) ? a.concat(b) : undefined; + * }); + * // => { 'fruits': ['apple', 'banana'], 'vegetables': ['beet', 'carrot] } */ - function create(prototype, properties) { - var result = baseCreate(prototype); - return properties ? baseAssign(result, properties) : result; + function merge(object) { + var args = arguments, + length = 2; + + if (!isObject(object)) { + return object; + } + // allows working with `_.reduce` and `_.reduceRight` without using + // their `index` and `collection` arguments + if (typeof args[2] != 'number') { + length = args.length; + } + if (length > 3 && typeof args[length - 2] == 'function') { + var callback = baseCreateCallback(args[--length - 1], args[length--], 2); + } else if (length > 2 && typeof args[length - 1] == 'function') { + callback = args[--length]; + } + var sources = slice(arguments, 1, length), + index = -1, + stackA = getArray(), + stackB = getArray(); + + while (++index < length) { + baseMerge(object, sources[index], callback, stackA, stackB); + } + releaseArray(stackA); + releaseArray(stackB); + return object; } /** - * Assigns own and inherited enumerable properties of source objects to the - * destination object for all destination properties that resolve to `undefined`. - * Source objects are applied from left to right. Once a property is set, - * additional values of the same property are ignored. - * - * **Note:** This method mutates `object`. + * Creates a shallow clone of `object` excluding the specified properties. + * Property names may be specified as individual arguments or as arrays of + * property names. If a callback is provided it will be executed for each + * property of `object` omitting the properties the callback returns truey + * for. The callback is bound to `thisArg` and invoked with three arguments; + * (value, key, object). * * @static * @memberOf _ - * @category Object - * @param {Object} object The destination object. - * @param {...Object} [sources] The source objects. - * @returns {Object} Returns `object`. + * @category Objects + * @param {Object} object The source object. + * @param {Function|...string|string[]} [callback] The properties to omit or the + * function called per iteration. + * @param {*} [thisArg] The `this` binding of `callback`. + * @returns {Object} Returns an object without the omitted properties. * @example * - * _.defaults({ 'user': 'barney' }, { 'age': 36 }, { 'user': 'fred' }); - * // => { 'user': 'barney', 'age': 36 } + * _.omit({ 'name': 'fred', 'age': 40 }, 'age'); + * // => { 'name': 'fred' } + * + * _.omit({ 'name': 'fred', 'age': 40 }, function(value) { + * return typeof value == 'number'; + * }); + * // => { 'name': 'fred' } */ - var defaults = rest(function(args) { - args.push(undefined, assignInDefaults); - return apply(assignInWith, undefined, args); - }); + function omit(object, callback, thisArg) { + var result = {}; + if (typeof callback != 'function') { + var props = []; + forIn(object, function(value, key) { + props.push(key); + }); + props = baseDifference(props, baseFlatten(arguments, true, false, 1)); + + var index = -1, + length = props.length; + + while (++index < length) { + var key = props[index]; + result[key] = object[key]; + } + } else { + callback = lodash.createCallback(callback, thisArg, 3); + forIn(object, function(value, key, object) { + if (!callback(value, key, object)) { + result[key] = value; + } + }); + } + return result; + } /** - * This method is like `_.defaults` except that it recursively assigns - * default properties. - * - * **Note:** This method mutates `object`. + * Creates a two dimensional array of an object's key-value pairs, + * i.e. `[[key1, value1], [key2, value2]]`. * * @static * @memberOf _ - * @category Object - * @param {Object} object The destination object. - * @param {...Object} [sources] The source objects. - * @returns {Object} Returns `object`. + * @category Objects + * @param {Object} object The object to inspect. + * @returns {Array} Returns new array of key-value pairs. * @example * - * _.defaultsDeep({ 'user': { 'name': 'barney' } }, { 'user': { 'name': 'fred', 'age': 36 } }); - * // => { 'user': { 'name': 'barney', 'age': 36 } } - * + * _.pairs({ 'barney': 36, 'fred': 40 }); + * // => [['barney', 36], ['fred', 40]] (property order is not guaranteed across environments) */ - var defaultsDeep = rest(function(args) { - args.push(undefined, mergeDefaults); - return apply(mergeWith, undefined, args); - }); + function pairs(object) { + var index = -1, + props = keys(object), + length = props.length, + result = Array(length); + + while (++index < length) { + var key = props[index]; + result[index] = [key, object[key]]; + } + return result; + } /** - * This method is like `_.find` except that it returns the key of the first - * element `predicate` returns truthy for instead of the element itself. + * Creates a shallow clone of `object` composed of the specified properties. + * Property names may be specified as individual arguments or as arrays of + * property names. If a callback is provided it will be executed for each + * property of `object` picking the properties the callback returns truey + * for. The callback is bound to `thisArg` and invoked with three arguments; + * (value, key, object). * * @static * @memberOf _ - * @category Object - * @param {Object} object The object to search. - * @param {Function|Object|string} [predicate=_.identity] The function invoked per iteration. - * @returns {string|undefined} Returns the key of the matched element, else `undefined`. + * @category Objects + * @param {Object} object The source object. + * @param {Function|...string|string[]} [callback] The function called per + * iteration or property names to pick, specified as individual property + * names or arrays of property names. + * @param {*} [thisArg] The `this` binding of `callback`. + * @returns {Object} Returns an object composed of the picked properties. * @example * - * var users = { - * 'barney': { 'age': 36, 'active': true }, - * 'fred': { 'age': 40, 'active': false }, - * 'pebbles': { 'age': 1, 'active': true } - * }; - * - * _.findKey(users, function(o) { return o.age < 40; }); - * // => 'barney' (iteration order is not guaranteed) - * - * // The `_.matches` iteratee shorthand. - * _.findKey(users, { 'age': 1, 'active': true }); - * // => 'pebbles' - * - * // The `_.matchesProperty` iteratee shorthand. - * _.findKey(users, ['active', false]); - * // => 'fred' + * _.pick({ 'name': 'fred', '_userid': 'fred1' }, 'name'); + * // => { 'name': 'fred' } * - * // The `_.property` iteratee shorthand. - * _.findKey(users, 'active'); - * // => 'barney' + * _.pick({ 'name': 'fred', '_userid': 'fred1' }, function(value, key) { + * return key.charAt(0) != '_'; + * }); + * // => { 'name': 'fred' } */ - function findKey(object, predicate) { - return baseFind(object, getIteratee(predicate, 3), baseForOwn, true); + function pick(object, callback, thisArg) { + var result = {}; + if (typeof callback != 'function') { + var index = -1, + props = baseFlatten(arguments, true, false, 1), + length = isObject(object) ? props.length : 0; + + while (++index < length) { + var key = props[index]; + if (key in object) { + result[key] = object[key]; + } + } + } else { + callback = lodash.createCallback(callback, thisArg, 3); + forIn(object, function(value, key, object) { + if (callback(value, key, object)) { + result[key] = value; + } + }); + } + return result; } /** - * This method is like `_.findKey` except that it iterates over elements of - * a collection in the opposite order. + * An alternative to `_.reduce` this method transforms `object` to a new + * `accumulator` object which is the result of running each of its own + * enumerable properties through a callback, with each callback execution + * potentially mutating the `accumulator` object. The callback is bound to + * `thisArg` and invoked with four arguments; (accumulator, value, key, object). + * Callbacks may exit iteration early by explicitly returning `false`. * * @static * @memberOf _ - * @category Object - * @param {Object} object The object to search. - * @param {Function|Object|string} [predicate=_.identity] The function invoked per iteration. - * @returns {string|undefined} Returns the key of the matched element, else `undefined`. + * @category Objects + * @param {Array|Object} object The object to iterate over. + * @param {Function} [callback=identity] The function called per iteration. + * @param {*} [accumulator] The custom accumulator value. + * @param {*} [thisArg] The `this` binding of `callback`. + * @returns {*} Returns the accumulated value. * @example * - * var users = { - * 'barney': { 'age': 36, 'active': true }, - * 'fred': { 'age': 40, 'active': false }, - * 'pebbles': { 'age': 1, 'active': true } - * }; - * - * _.findLastKey(users, function(o) { return o.age < 40; }); - * // => returns 'pebbles' assuming `_.findKey` returns 'barney' - * - * // The `_.matches` iteratee shorthand. - * _.findLastKey(users, { 'age': 36, 'active': true }); - * // => 'barney' - * - * // The `_.matchesProperty` iteratee shorthand. - * _.findLastKey(users, ['active', false]); - * // => 'fred' + * var squares = _.transform([1, 2, 3, 4, 5, 6, 7, 8, 9, 10], function(result, num) { + * num *= num; + * if (num % 2) { + * return result.push(num) < 3; + * } + * }); + * // => [1, 9, 25] * - * // The `_.property` iteratee shorthand. - * _.findLastKey(users, 'active'); - * // => 'pebbles' + * var mapped = _.transform({ 'a': 1, 'b': 2, 'c': 3 }, function(result, num, key) { + * result[key] = num * 3; + * }); + * // => { 'a': 3, 'b': 6, 'c': 9 } */ - function findLastKey(object, predicate) { - return baseFind(object, getIteratee(predicate, 3), baseForOwnRight, true); + function transform(object, callback, accumulator, thisArg) { + var isArr = isArray(object); + if (accumulator == null) { + if (isArr) { + accumulator = []; + } else { + var ctor = object && object.constructor, + proto = ctor && ctor.prototype; + + accumulator = baseCreate(proto); + } + } + if (callback) { + callback = lodash.createCallback(callback, thisArg, 4); + (isArr ? baseEach : forOwn)(object, function(value, index, object) { + return callback(accumulator, value, index, object); + }); + } + return accumulator; } /** - * Iterates over own and inherited enumerable properties of an object invoking - * `iteratee` for each property. The iteratee is invoked with three arguments: - * (value, key, object). Iteratee functions may exit iteration early by explicitly - * returning `false`. + * Creates an array composed of the own enumerable property values of `object`. * * @static * @memberOf _ - * @category Object - * @param {Object} object The object to iterate over. - * @param {Function} [iteratee=_.identity] The function invoked per iteration. - * @returns {Object} Returns `object`. + * @category Objects + * @param {Object} object The object to inspect. + * @returns {Array} Returns an array of property values. * @example * - * function Foo() { - * this.a = 1; - * this.b = 2; - * } - * - * Foo.prototype.c = 3; - * - * _.forIn(new Foo, function(value, key) { - * console.log(key); - * }); - * // => logs 'a', 'b', then 'c' (iteration order is not guaranteed) + * _.values({ 'one': 1, 'two': 2, 'three': 3 }); + * // => [1, 2, 3] (property order is not guaranteed across environments) */ - function forIn(object, iteratee) { - return object == null - ? object - : baseFor(object, baseCastFunction(iteratee), keysIn); + function values(object) { + var index = -1, + props = keys(object), + length = props.length, + result = Array(length); + + while (++index < length) { + result[index] = object[props[index]]; + } + return result; } + /*--------------------------------------------------------------------------*/ + /** - * This method is like `_.forIn` except that it iterates over properties of - * `object` in the opposite order. + * Creates an array of elements from the specified indexes, or keys, of the + * `collection`. Indexes may be specified as individual arguments or as arrays + * of indexes. * * @static * @memberOf _ - * @category Object - * @param {Object} object The object to iterate over. - * @param {Function} [iteratee=_.identity] The function invoked per iteration. - * @returns {Object} Returns `object`. + * @category Collections + * @param {Array|Object|string} collection The collection to iterate over. + * @param {...(number|number[]|string|string[])} [index] The indexes of `collection` + * to retrieve, specified as individual indexes or arrays of indexes. + * @returns {Array} Returns a new array of elements corresponding to the + * provided indexes. * @example * - * function Foo() { - * this.a = 1; - * this.b = 2; - * } - * - * Foo.prototype.c = 3; + * _.at(['a', 'b', 'c', 'd', 'e'], [0, 2, 4]); + * // => ['a', 'c', 'e'] * - * _.forInRight(new Foo, function(value, key) { - * console.log(key); - * }); - * // => logs 'c', 'b', then 'a' assuming `_.forIn` logs 'a', 'b', then 'c' + * _.at(['fred', 'barney', 'pebbles'], 0, 2); + * // => ['fred', 'pebbles'] */ - function forInRight(object, iteratee) { - return object == null - ? object - : baseForRight(object, baseCastFunction(iteratee), keysIn); + function at(collection) { + var args = arguments, + index = -1, + props = baseFlatten(args, true, false, 1), + length = (args[2] && args[2][args[1]] === collection) ? 1 : props.length, + result = Array(length); + + if (support.unindexedChars && isString(collection)) { + collection = collection.split(''); + } + while(++index < length) { + result[index] = collection[props[index]]; + } + return result; } /** - * Iterates over own enumerable properties of an object invoking `iteratee` - * for each property. The iteratee is invoked with three arguments: - * (value, key, object). Iteratee functions may exit iteration early by - * explicitly returning `false`. + * Checks if a given value is present in a collection using strict equality + * for comparisons, i.e. `===`. If `fromIndex` is negative, it is used as the + * offset from the end of the collection. * * @static * @memberOf _ - * @category Object - * @param {Object} object The object to iterate over. - * @param {Function} [iteratee=_.identity] The function invoked per iteration. - * @returns {Object} Returns `object`. + * @alias include + * @category Collections + * @param {Array|Object|string} collection The collection to iterate over. + * @param {*} target The value to check for. + * @param {number} [fromIndex=0] The index to search from. + * @returns {boolean} Returns `true` if the `target` element is found, else `false`. * @example * - * function Foo() { - * this.a = 1; - * this.b = 2; - * } + * _.contains([1, 2, 3], 1); + * // => true * - * Foo.prototype.c = 3; + * _.contains([1, 2, 3], 1, 2); + * // => false * - * _.forOwn(new Foo, function(value, key) { - * console.log(key); - * }); - * // => logs 'a' then 'b' (iteration order is not guaranteed) + * _.contains({ 'name': 'fred', 'age': 40 }, 'fred'); + * // => true + * + * _.contains('pebbles', 'eb'); + * // => true */ - function forOwn(object, iteratee) { - return object && baseForOwn(object, baseCastFunction(iteratee)); + function contains(collection, target, fromIndex) { + var index = -1, + indexOf = getIndexOf(), + length = collection ? collection.length : 0, + result = false; + + fromIndex = (fromIndex < 0 ? nativeMax(0, length + fromIndex) : fromIndex) || 0; + if (isArray(collection)) { + result = indexOf(collection, target, fromIndex) > -1; + } else if (typeof length == 'number') { + result = (isString(collection) ? collection.indexOf(target, fromIndex) : indexOf(collection, target, fromIndex)) > -1; + } else { + baseEach(collection, function(value) { + if (++index >= fromIndex) { + return !(result = value === target); + } + }); + } + return result; } /** - * This method is like `_.forOwn` except that it iterates over properties of - * `object` in the opposite order. + * Creates an object composed of keys generated from the results of running + * each element of `collection` through the callback. The corresponding value + * of each key is the number of times the key was returned by the callback. + * The callback is bound to `thisArg` and invoked with three arguments; + * (value, index|key, collection). + * + * If a property name is provided for `callback` the created "_.pluck" style + * callback will return the property value of the given element. + * + * If an object is provided for `callback` the created "_.where" style callback + * will return `true` for elements that have the properties of the given object, + * else `false`. * * @static * @memberOf _ - * @category Object - * @param {Object} object The object to iterate over. - * @param {Function} [iteratee=_.identity] The function invoked per iteration. - * @returns {Object} Returns `object`. + * @category Collections + * @param {Array|Object|string} collection The collection to iterate over. + * @param {Function|Object|string} [callback=identity] The function called + * per iteration. If a property name or object is provided it will be used + * to create a "_.pluck" or "_.where" style callback, respectively. + * @param {*} [thisArg] The `this` binding of `callback`. + * @returns {Object} Returns the composed aggregate object. * @example * - * function Foo() { - * this.a = 1; - * this.b = 2; - * } + * _.countBy([4.3, 6.1, 6.4], function(num) { return Math.floor(num); }); + * // => { '4': 1, '6': 2 } * - * Foo.prototype.c = 3; + * _.countBy([4.3, 6.1, 6.4], function(num) { return this.floor(num); }, Math); + * // => { '4': 1, '6': 2 } * - * _.forOwnRight(new Foo, function(value, key) { - * console.log(key); - * }); - * // => logs 'b' then 'a' assuming `_.forOwn` logs 'a' then 'b' + * _.countBy(['one', 'two', 'three'], 'length'); + * // => { '3': 2, '5': 1 } */ - function forOwnRight(object, iteratee) { - return object && baseForOwnRight(object, baseCastFunction(iteratee)); - } + var countBy = createAggregator(function(result, value, key) { + (hasOwnProperty.call(result, key) ? result[key]++ : result[key] = 1); + }); /** - * Creates an array of function property names from own enumerable properties - * of `object`. + * Checks if the given callback returns truey value for **all** elements of + * a collection. The callback is bound to `thisArg` and invoked with three + * arguments; (value, index|key, collection). + * + * If a property name is provided for `callback` the created "_.pluck" style + * callback will return the property value of the given element. + * + * If an object is provided for `callback` the created "_.where" style callback + * will return `true` for elements that have the properties of the given object, + * else `false`. * * @static * @memberOf _ - * @category Object - * @param {Object} object The object to inspect. - * @returns {Array} Returns the new array of property names. + * @alias all + * @category Collections + * @param {Array|Object|string} collection The collection to iterate over. + * @param {Function|Object|string} [callback=identity] The function called + * per iteration. If a property name or object is provided it will be used + * to create a "_.pluck" or "_.where" style callback, respectively. + * @param {*} [thisArg] The `this` binding of `callback`. + * @returns {boolean} Returns `true` if all elements passed the callback check, + * else `false`. * @example * - * function Foo() { - * this.a = _.constant('a'); - * this.b = _.constant('b'); - * } + * _.every([true, 1, null, 'yes']); + * // => false + * + * var characters = [ + * { 'name': 'barney', 'age': 36 }, + * { 'name': 'fred', 'age': 40 } + * ]; * - * Foo.prototype.c = _.constant('c'); + * // using "_.pluck" callback shorthand + * _.every(characters, 'age'); + * // => true * - * _.functions(new Foo); - * // => ['a', 'b'] + * // using "_.where" callback shorthand + * _.every(characters, { 'age': 36 }); + * // => false */ - function functions(object) { - return object == null ? [] : baseFunctions(object, keys(object)); + function every(collection, callback, thisArg) { + var result = true; + callback = lodash.createCallback(callback, thisArg, 3); + + if (isArray(collection)) { + var index = -1, + length = collection.length; + + while (++index < length) { + if (!(result = !!callback(collection[index], index, collection))) { + break; + } + } + } else { + baseEach(collection, function(value, index, collection) { + return (result = !!callback(value, index, collection)); + }); + } + return result; } /** - * Creates an array of function property names from own and inherited - * enumerable properties of `object`. + * Iterates over elements of a collection, returning an array of all elements + * the callback returns truey for. The callback is bound to `thisArg` and + * invoked with three arguments; (value, index|key, collection). + * + * If a property name is provided for `callback` the created "_.pluck" style + * callback will return the property value of the given element. + * + * If an object is provided for `callback` the created "_.where" style callback + * will return `true` for elements that have the properties of the given object, + * else `false`. * * @static * @memberOf _ - * @category Object - * @param {Object} object The object to inspect. - * @returns {Array} Returns the new array of property names. + * @alias select + * @category Collections + * @param {Array|Object|string} collection The collection to iterate over. + * @param {Function|Object|string} [callback=identity] The function called + * per iteration. If a property name or object is provided it will be used + * to create a "_.pluck" or "_.where" style callback, respectively. + * @param {*} [thisArg] The `this` binding of `callback`. + * @returns {Array} Returns a new array of elements that passed the callback check. * @example * - * function Foo() { - * this.a = _.constant('a'); - * this.b = _.constant('b'); - * } + * var evens = _.filter([1, 2, 3, 4, 5, 6], function(num) { return num % 2 == 0; }); + * // => [2, 4, 6] * - * Foo.prototype.c = _.constant('c'); + * var characters = [ + * { 'name': 'barney', 'age': 36, 'blocked': false }, + * { 'name': 'fred', 'age': 40, 'blocked': true } + * ]; + * + * // using "_.pluck" callback shorthand + * _.filter(characters, 'blocked'); + * // => [{ 'name': 'fred', 'age': 40, 'blocked': true }] * - * _.functionsIn(new Foo); - * // => ['a', 'b', 'c'] + * // using "_.where" callback shorthand + * _.filter(characters, { 'age': 36 }); + * // => [{ 'name': 'barney', 'age': 36, 'blocked': false }] */ - function functionsIn(object) { - return object == null ? [] : baseFunctions(object, keysIn(object)); + function filter(collection, callback, thisArg) { + var result = []; + callback = lodash.createCallback(callback, thisArg, 3); + + if (isArray(collection)) { + var index = -1, + length = collection.length; + + while (++index < length) { + var value = collection[index]; + if (callback(value, index, collection)) { + result.push(value); + } + } + } else { + baseEach(collection, function(value, index, collection) { + if (callback(value, index, collection)) { + result.push(value); + } + }); + } + return result; } /** - * Gets the value at `path` of `object`. If the resolved value is - * `undefined` the `defaultValue` is used in its place. + * Iterates over elements of a collection, returning the first element that + * the callback returns truey for. The callback is bound to `thisArg` and + * invoked with three arguments; (value, index|key, collection). + * + * If a property name is provided for `callback` the created "_.pluck" style + * callback will return the property value of the given element. + * + * If an object is provided for `callback` the created "_.where" style callback + * will return `true` for elements that have the properties of the given object, + * else `false`. * * @static * @memberOf _ - * @category Object - * @param {Object} object The object to query. - * @param {Array|string} path The path of the property to get. - * @param {*} [defaultValue] The value returned if the resolved value is `undefined`. - * @returns {*} Returns the resolved value. + * @alias detect, findWhere + * @category Collections + * @param {Array|Object|string} collection The collection to iterate over. + * @param {Function|Object|string} [callback=identity] The function called + * per iteration. If a property name or object is provided it will be used + * to create a "_.pluck" or "_.where" style callback, respectively. + * @param {*} [thisArg] The `this` binding of `callback`. + * @returns {*} Returns the found element, else `undefined`. * @example * - * var object = { 'a': [{ 'b': { 'c': 3 } }] }; + * var characters = [ + * { 'name': 'barney', 'age': 36, 'blocked': false }, + * { 'name': 'fred', 'age': 40, 'blocked': true }, + * { 'name': 'pebbles', 'age': 1, 'blocked': false } + * ]; * - * _.get(object, 'a[0].b.c'); - * // => 3 + * _.find(characters, function(chr) { + * return chr.age < 40; + * }); + * // => { 'name': 'barney', 'age': 36, 'blocked': false } * - * _.get(object, ['a', '0', 'b', 'c']); - * // => 3 + * // using "_.where" callback shorthand + * _.find(characters, { 'age': 1 }); + * // => { 'name': 'pebbles', 'age': 1, 'blocked': false } * - * _.get(object, 'a.b.c', 'default'); - * // => 'default' + * // using "_.pluck" callback shorthand + * _.find(characters, 'blocked'); + * // => { 'name': 'fred', 'age': 40, 'blocked': true } */ - function get(object, path, defaultValue) { - var result = object == null ? undefined : baseGet(object, path); - return result === undefined ? defaultValue : result; + function find(collection, callback, thisArg) { + callback = lodash.createCallback(callback, thisArg, 3); + + if (isArray(collection)) { + var index = -1, + length = collection.length; + + while (++index < length) { + var value = collection[index]; + if (callback(value, index, collection)) { + return value; + } + } + } else { + var result; + baseEach(collection, function(value, index, collection) { + if (callback(value, index, collection)) { + result = value; + return false; + } + }); + return result; + } } /** - * Checks if `path` is a direct property of `object`. + * This method is like `_.find` except that it iterates over elements + * of a `collection` from right to left. * * @static * @memberOf _ - * @category Object - * @param {Object} object The object to query. - * @param {Array|string} path The path to check. - * @returns {boolean} Returns `true` if `path` exists, else `false`. + * @category Collections + * @param {Array|Object|string} collection The collection to iterate over. + * @param {Function|Object|string} [callback=identity] The function called + * per iteration. If a property name or object is provided it will be used + * to create a "_.pluck" or "_.where" style callback, respectively. + * @param {*} [thisArg] The `this` binding of `callback`. + * @returns {*} Returns the found element, else `undefined`. * @example * - * var object = { 'a': { 'b': { 'c': 3 } } }; - * var other = _.create({ 'a': _.create({ 'b': _.create({ 'c': 3 }) }) }); + * _.findLast([1, 2, 3, 4], function(num) { + * return num % 2 == 1; + * }); + * // => 3 + */ + function findLast(collection, callback, thisArg) { + var result; + callback = lodash.createCallback(callback, thisArg, 3); + forEachRight(collection, function(value, index, collection) { + if (callback(value, index, collection)) { + result = value; + return false; + } + }); + return result; + } + + /** + * Iterates over elements of a collection, executing the callback for each + * element. The callback is bound to `thisArg` and invoked with three arguments; + * (value, index|key, collection). Callbacks may exit iteration early by + * explicitly returning `false`. * - * _.has(object, 'a'); - * // => true + * Note: As with other "Collections" methods, objects with a `length` property + * are iterated like arrays. To avoid this behavior `_.forIn` or `_.forOwn` + * may be used for object iteration. * - * _.has(object, 'a.b.c'); - * // => true + * @static + * @memberOf _ + * @alias each + * @category Collections + * @param {Array|Object|string} collection The collection to iterate over. + * @param {Function} [callback=identity] The function called per iteration. + * @param {*} [thisArg] The `this` binding of `callback`. + * @returns {Array|Object|string} Returns `collection`. + * @example * - * _.has(object, ['a', 'b', 'c']); - * // => true + * _([1, 2, 3]).forEach(function(num) { console.log(num); }).join(','); + * // => logs each number and returns '1,2,3' * - * _.has(other, 'a'); - * // => false + * _.forEach({ 'one': 1, 'two': 2, 'three': 3 }, function(num) { console.log(num); }); + * // => logs each number and returns the object (property order is not guaranteed across environments) */ - function has(object, path) { - return hasPath(object, path, baseHas); + function forEach(collection, callback, thisArg) { + if (callback && typeof thisArg == 'undefined' && isArray(collection)) { + var index = -1, + length = collection.length; + + while (++index < length) { + if (callback(collection[index], index, collection) === false) { + break; + } + } + } else { + baseEach(collection, callback, thisArg); + } + return collection; } /** - * Checks if `path` is a direct or inherited property of `object`. + * This method is like `_.forEach` except that it iterates over elements + * of a `collection` from right to left. * * @static * @memberOf _ - * @category Object - * @param {Object} object The object to query. - * @param {Array|string} path The path to check. - * @returns {boolean} Returns `true` if `path` exists, else `false`. + * @alias eachRight + * @category Collections + * @param {Array|Object|string} collection The collection to iterate over. + * @param {Function} [callback=identity] The function called per iteration. + * @param {*} [thisArg] The `this` binding of `callback`. + * @returns {Array|Object|string} Returns `collection`. * @example * - * var object = _.create({ 'a': _.create({ 'b': _.create({ 'c': 3 }) }) }); - * - * _.hasIn(object, 'a'); - * // => true - * - * _.hasIn(object, 'a.b.c'); - * // => true - * - * _.hasIn(object, ['a', 'b', 'c']); - * // => true - * - * _.hasIn(object, 'b'); - * // => false + * _([1, 2, 3]).forEachRight(function(num) { console.log(num); }).join(','); + * // => logs each number from right to left and returns '3,2,1' */ - function hasIn(object, path) { - return hasPath(object, path, baseHasIn); + function forEachRight(collection, callback, thisArg) { + var iterable = collection, + length = collection ? collection.length : 0; + + callback = callback && typeof thisArg == 'undefined' ? callback : baseCreateCallback(callback, thisArg, 3); + if (isArray(collection)) { + while (length--) { + if (callback(collection[length], length, collection) === false) { + break; + } + } + } else { + if (typeof length != 'number') { + var props = keys(collection); + length = props.length; + } else if (support.unindexedChars && isString(collection)) { + iterable = collection.split(''); + } + baseEach(collection, function(value, key, collection) { + key = props ? props[--length] : --length; + return callback(iterable[key], key, collection); + }); + } + return collection; } /** - * Creates an object composed of the inverted keys and values of `object`. - * If `object` contains duplicate values, subsequent values overwrite property - * assignments of previous values. + * Creates an object composed of keys generated from the results of running + * each element of a collection through the callback. The corresponding value + * of each key is an array of the elements responsible for generating the key. + * The callback is bound to `thisArg` and invoked with three arguments; + * (value, index|key, collection). + * + * If a property name is provided for `callback` the created "_.pluck" style + * callback will return the property value of the given element. + * + * If an object is provided for `callback` the created "_.where" style callback + * will return `true` for elements that have the properties of the given object, + * else `false` * * @static * @memberOf _ - * @category Object - * @param {Object} object The object to invert. - * @returns {Object} Returns the new inverted object. + * @category Collections + * @param {Array|Object|string} collection The collection to iterate over. + * @param {Function|Object|string} [callback=identity] The function called + * per iteration. If a property name or object is provided it will be used + * to create a "_.pluck" or "_.where" style callback, respectively. + * @param {*} [thisArg] The `this` binding of `callback`. + * @returns {Object} Returns the composed aggregate object. * @example * - * var object = { 'a': 1, 'b': 2, 'c': 1 }; + * _.groupBy([4.2, 6.1, 6.4], function(num) { return Math.floor(num); }); + * // => { '4': [4.2], '6': [6.1, 6.4] } * - * _.invert(object); - * // => { '1': 'c', '2': 'b' } + * _.groupBy([4.2, 6.1, 6.4], function(num) { return this.floor(num); }, Math); + * // => { '4': [4.2], '6': [6.1, 6.4] } + * + * // using "_.pluck" callback shorthand + * _.groupBy(['one', 'two', 'three'], 'length'); + * // => { '3': ['one', 'two'], '5': ['three'] } */ - var invert = createInverter(function(result, value, key) { - result[value] = key; - }, constant(identity)); + var groupBy = createAggregator(function(result, value, key) { + (hasOwnProperty.call(result, key) ? result[key] : result[key] = []).push(value); + }); /** - * This method is like `_.invert` except that the inverted object is generated - * from the results of running each element of `object` through `iteratee`. - * The corresponding inverted value of each inverted key is an array of keys - * responsible for generating the inverted value. The iteratee is invoked - * with one argument: (value). + * Creates an object composed of keys generated from the results of running + * each element of the collection through the given callback. The corresponding + * value of each key is the last element responsible for generating the key. + * The callback is bound to `thisArg` and invoked with three arguments; + * (value, index|key, collection). + * + * If a property name is provided for `callback` the created "_.pluck" style + * callback will return the property value of the given element. + * + * If an object is provided for `callback` the created "_.where" style callback + * will return `true` for elements that have the properties of the given object, + * else `false`. * * @static * @memberOf _ - * @category Object - * @param {Object} object The object to invert. - * @param {Function|Object|string} [iteratee=_.identity] The iteratee invoked per element. - * @returns {Object} Returns the new inverted object. + * @category Collections + * @param {Array|Object|string} collection The collection to iterate over. + * @param {Function|Object|string} [callback=identity] The function called + * per iteration. If a property name or object is provided it will be used + * to create a "_.pluck" or "_.where" style callback, respectively. + * @param {*} [thisArg] The `this` binding of `callback`. + * @returns {Object} Returns the composed aggregate object. * @example * - * var object = { 'a': 1, 'b': 2, 'c': 1 }; + * var keys = [ + * { 'dir': 'left', 'code': 97 }, + * { 'dir': 'right', 'code': 100 } + * ]; + * + * _.indexBy(keys, 'dir'); + * // => { 'left': { 'dir': 'left', 'code': 97 }, 'right': { 'dir': 'right', 'code': 100 } } * - * _.invertBy(object); - * // => { '1': ['a', 'c'], '2': ['b'] } + * _.indexBy(keys, function(key) { return String.fromCharCode(key.code); }); + * // => { 'a': { 'dir': 'left', 'code': 97 }, 'd': { 'dir': 'right', 'code': 100 } } * - * _.invertBy(object, function(value) { - * return 'group' + value; - * }); - * // => { 'group1': ['a', 'c'], 'group2': ['b'] } + * _.indexBy(characters, function(key) { this.fromCharCode(key.code); }, String); + * // => { 'a': { 'dir': 'left', 'code': 97 }, 'd': { 'dir': 'right', 'code': 100 } } */ - var invertBy = createInverter(function(result, value, key) { - if (hasOwnProperty.call(result, value)) { - result[value].push(key); - } else { - result[value] = [key]; - } - }, getIteratee); + var indexBy = createAggregator(function(result, value, key) { + result[key] = value; + }); /** - * Invokes the method at `path` of `object`. + * Invokes the method named by `methodName` on each element in the `collection` + * returning an array of the results of each invoked method. Additional arguments + * will be provided to each invoked method. If `methodName` is a function it + * will be invoked for, and `this` bound to, each element in the `collection`. * * @static * @memberOf _ - * @category Object - * @param {Object} object The object to query. - * @param {Array|string} path The path of the method to invoke. - * @param {...*} [args] The arguments to invoke the method with. - * @returns {*} Returns the result of the invoked method. + * @category Collections + * @param {Array|Object|string} collection The collection to iterate over. + * @param {Function|string} methodName The name of the method to invoke or + * the function invoked per iteration. + * @param {...*} [arg] Arguments to invoke the method with. + * @returns {Array} Returns a new array of the results of each invoked method. * @example * - * var object = { 'a': [{ 'b': { 'c': [1, 2, 3, 4] } }] }; + * _.invoke([[5, 1, 7], [3, 2, 1]], 'sort'); + * // => [[1, 5, 7], [1, 2, 3]] * - * _.invoke(object, 'a[0].b.c.slice', 1, 3); - * // => [2, 3] + * _.invoke([123, 456], String.prototype.split, ''); + * // => [['1', '2', '3'], ['4', '5', '6']] */ - var invoke = rest(baseInvoke); + function invoke(collection, methodName) { + var args = slice(arguments, 2), + index = -1, + isFunc = typeof methodName == 'function', + length = collection ? collection.length : 0, + result = Array(typeof length == 'number' ? length : 0); + + forEach(collection, function(value) { + result[++index] = (isFunc ? methodName : value[methodName]).apply(value, args); + }); + return result; + } /** - * Creates an array of the own enumerable property names of `object`. + * Creates an array of values by running each element in the collection + * through the callback. The callback is bound to `thisArg` and invoked with + * three arguments; (value, index|key, collection). * - * **Note:** Non-object values are coerced to objects. See the - * [ES spec](http://ecma-international.org/ecma-262/6.0/#sec-object.keys) - * for more details. + * If a property name is provided for `callback` the created "_.pluck" style + * callback will return the property value of the given element. + * + * If an object is provided for `callback` the created "_.where" style callback + * will return `true` for elements that have the properties of the given object, + * else `false`. * * @static * @memberOf _ - * @category Object - * @param {Object} object The object to query. - * @returns {Array} Returns the array of property names. + * @alias collect + * @category Collections + * @param {Array|Object|string} collection The collection to iterate over. + * @param {Function|Object|string} [callback=identity] The function called + * per iteration. If a property name or object is provided it will be used + * to create a "_.pluck" or "_.where" style callback, respectively. + * @param {*} [thisArg] The `this` binding of `callback`. + * @returns {Array} Returns a new array of the results of each `callback` execution. * @example * - * function Foo() { - * this.a = 1; - * this.b = 2; - * } + * _.map([1, 2, 3], function(num) { return num * 3; }); + * // => [3, 6, 9] * - * Foo.prototype.c = 3; + * _.map({ 'one': 1, 'two': 2, 'three': 3 }, function(num) { return num * 3; }); + * // => [3, 6, 9] (property order is not guaranteed across environments) * - * _.keys(new Foo); - * // => ['a', 'b'] (iteration order is not guaranteed) + * var characters = [ + * { 'name': 'barney', 'age': 36 }, + * { 'name': 'fred', 'age': 40 } + * ]; * - * _.keys('hi'); - * // => ['0', '1'] + * // using "_.pluck" callback shorthand + * _.map(characters, 'name'); + * // => ['barney', 'fred'] */ - function keys(object) { - var isProto = isPrototype(object); - if (!(isProto || isArrayLike(object))) { - return baseKeys(object); - } - var indexes = indexKeys(object), - skipIndexes = !!indexes, - result = indexes || [], - length = result.length; + function map(collection, callback, thisArg) { + var index = -1, + length = collection ? collection.length : 0, + result = Array(typeof length == 'number' ? length : 0); - for (var key in object) { - if (baseHas(object, key) && - !(skipIndexes && (key == 'length' || isIndex(key, length))) && - !(isProto && key == 'constructor')) { - result.push(key); + callback = lodash.createCallback(callback, thisArg, 3); + if (isArray(collection)) { + while (++index < length) { + result[index] = callback(collection[index], index, collection); } + } else { + baseEach(collection, function(value, key, collection) { + result[++index] = callback(value, key, collection); + }); } return result; } /** - * Creates an array of the own and inherited enumerable property names of `object`. + * Retrieves the maximum value of a collection. If the collection is empty or + * falsey `-Infinity` is returned. If a callback is provided it will be executed + * for each value in the collection to generate the criterion by which the value + * is ranked. The callback is bound to `thisArg` and invoked with three + * arguments; (value, index, collection). + * + * If a property name is provided for `callback` the created "_.pluck" style + * callback will return the property value of the given element. * - * **Note:** Non-object values are coerced to objects. + * If an object is provided for `callback` the created "_.where" style callback + * will return `true` for elements that have the properties of the given object, + * else `false`. * * @static * @memberOf _ - * @category Object - * @param {Object} object The object to query. - * @returns {Array} Returns the array of property names. + * @category Collections + * @param {Array|Object|string} collection The collection to iterate over. + * @param {Function|Object|string} [callback=identity] The function called + * per iteration. If a property name or object is provided it will be used + * to create a "_.pluck" or "_.where" style callback, respectively. + * @param {*} [thisArg] The `this` binding of `callback`. + * @returns {*} Returns the maximum value. * @example * - * function Foo() { - * this.a = 1; - * this.b = 2; - * } + * _.max([4, 2, 8, 6]); + * // => 8 + * + * var characters = [ + * { 'name': 'barney', 'age': 36 }, + * { 'name': 'fred', 'age': 40 } + * ]; * - * Foo.prototype.c = 3; + * _.max(characters, function(chr) { return chr.age; }); + * // => { 'name': 'fred', 'age': 40 }; * - * _.keysIn(new Foo); - * // => ['a', 'b', 'c'] (iteration order is not guaranteed) + * // using "_.pluck" callback shorthand + * _.max(characters, 'age'); + * // => { 'name': 'fred', 'age': 40 }; */ - function keysIn(object) { - var index = -1, - isProto = isPrototype(object), - props = baseKeysIn(object), - propsLength = props.length, - indexes = indexKeys(object), - skipIndexes = !!indexes, - result = indexes || [], - length = result.length; - - while (++index < propsLength) { - var key = props[index]; - if (!(skipIndexes && (key == 'length' || isIndex(key, length))) && - !(key == 'constructor' && (isProto || !hasOwnProperty.call(object, key)))) { - result.push(key); + function max(collection, callback, thisArg) { + var computed = -Infinity, + result = computed; + + // allows working with functions like `_.map` without using + // their `index` argument as a callback + if (typeof callback != 'function' && thisArg && thisArg[callback] === collection) { + callback = null; + } + if (callback == null && isArray(collection)) { + var index = -1, + length = collection.length; + + while (++index < length) { + var value = collection[index]; + if (value > result) { + result = value; + } } + } else { + callback = (callback == null && isString(collection)) + ? charAtCallback + : lodash.createCallback(callback, thisArg, 3); + + baseEach(collection, function(value, index, collection) { + var current = callback(value, index, collection); + if (current > computed) { + computed = current; + result = value; + } + }); } return result; } /** - * The opposite of `_.mapValues`; this method creates an object with the - * same values as `object` and keys generated by running each own enumerable - * property of `object` through `iteratee`. The iteratee is invoked with - * three arguments: (value, key, object). + * Retrieves the minimum value of a collection. If the collection is empty or + * falsey `Infinity` is returned. If a callback is provided it will be executed + * for each value in the collection to generate the criterion by which the value + * is ranked. The callback is bound to `thisArg` and invoked with three + * arguments; (value, index, collection). * - * @static - * @memberOf _ - * @category Object - * @param {Object} object The object to iterate over. - * @param {Function|Object|string} [iteratee=_.identity] The function invoked per iteration. - * @returns {Object} Returns the new mapped object. - * @example + * If a property name is provided for `callback` the created "_.pluck" style + * callback will return the property value of the given element. * - * _.mapKeys({ 'a': 1, 'b': 2 }, function(value, key) { - * return key + value; - * }); - * // => { 'a1': 1, 'b2': 2 } - */ - function mapKeys(object, iteratee) { - var result = {}; - iteratee = getIteratee(iteratee, 3); - - baseForOwn(object, function(value, key, object) { - result[iteratee(value, key, object)] = value; - }); - return result; - } - - /** - * Creates an object with the same keys as `object` and values generated by - * running each own enumerable property of `object` through `iteratee`. The - * iteratee is invoked with three arguments: (value, key, object). + * If an object is provided for `callback` the created "_.where" style callback + * will return `true` for elements that have the properties of the given object, + * else `false`. * * @static * @memberOf _ - * @category Object - * @param {Object} object The object to iterate over. - * @param {Function|Object|string} [iteratee=_.identity] The function invoked per iteration. - * @returns {Object} Returns the new mapped object. + * @category Collections + * @param {Array|Object|string} collection The collection to iterate over. + * @param {Function|Object|string} [callback=identity] The function called + * per iteration. If a property name or object is provided it will be used + * to create a "_.pluck" or "_.where" style callback, respectively. + * @param {*} [thisArg] The `this` binding of `callback`. + * @returns {*} Returns the minimum value. * @example * - * var users = { - * 'fred': { 'user': 'fred', 'age': 40 }, - * 'pebbles': { 'user': 'pebbles', 'age': 1 } - * }; + * _.min([4, 2, 8, 6]); + * // => 2 + * + * var characters = [ + * { 'name': 'barney', 'age': 36 }, + * { 'name': 'fred', 'age': 40 } + * ]; * - * _.mapValues(users, function(o) { return o.age; }); - * // => { 'fred': 40, 'pebbles': 1 } (iteration order is not guaranteed) + * _.min(characters, function(chr) { return chr.age; }); + * // => { 'name': 'barney', 'age': 36 }; * - * // The `_.property` iteratee shorthand. - * _.mapValues(users, 'age'); - * // => { 'fred': 40, 'pebbles': 1 } (iteration order is not guaranteed) + * // using "_.pluck" callback shorthand + * _.min(characters, 'age'); + * // => { 'name': 'barney', 'age': 36 }; */ - function mapValues(object, iteratee) { - var result = {}; - iteratee = getIteratee(iteratee, 3); + function min(collection, callback, thisArg) { + var computed = Infinity, + result = computed; - baseForOwn(object, function(value, key, object) { - result[key] = iteratee(value, key, object); - }); + // allows working with functions like `_.map` without using + // their `index` argument as a callback + if (typeof callback != 'function' && thisArg && thisArg[callback] === collection) { + callback = null; + } + if (callback == null && isArray(collection)) { + var index = -1, + length = collection.length; + + while (++index < length) { + var value = collection[index]; + if (value < result) { + result = value; + } + } + } else { + callback = (callback == null && isString(collection)) + ? charAtCallback + : lodash.createCallback(callback, thisArg, 3); + + baseEach(collection, function(value, index, collection) { + var current = callback(value, index, collection); + if (current < computed) { + computed = current; + result = value; + } + }); + } return result; } /** - * This method is like `_.assign` except that it recursively merges own and - * inherited enumerable properties of source objects into the destination - * object. Source properties that resolve to `undefined` are skipped if a - * destination value exists. Array and plain object properties are merged - * recursively.Other objects and value types are overridden by assignment. - * Source objects are applied from left to right. Subsequent sources - * overwrite property assignments of previous sources. - * - * **Note:** This method mutates `object`. + * Retrieves the value of a specified property from all elements in the collection. * * @static * @memberOf _ - * @category Object - * @param {Object} object The destination object. - * @param {...Object} [sources] The source objects. - * @returns {Object} Returns `object`. + * @type Function + * @category Collections + * @param {Array|Object|string} collection The collection to iterate over. + * @param {string} property The name of the property to pluck. + * @returns {Array} Returns a new array of property values. * @example * - * var users = { - * 'data': [{ 'user': 'barney' }, { 'user': 'fred' }] - * }; - * - * var ages = { - * 'data': [{ 'age': 36 }, { 'age': 40 }] - * }; + * var characters = [ + * { 'name': 'barney', 'age': 36 }, + * { 'name': 'fred', 'age': 40 } + * ]; * - * _.merge(users, ages); - * // => { 'data': [{ 'user': 'barney', 'age': 36 }, { 'user': 'fred', 'age': 40 }] } + * _.pluck(characters, 'name'); + * // => ['barney', 'fred'] */ - var merge = createAssigner(function(object, source, srcIndex) { - baseMerge(object, source, srcIndex); - }); + var pluck = map; /** - * This method is like `_.merge` except that it accepts `customizer` which - * is invoked to produce the merged values of the destination and source - * properties. If `customizer` returns `undefined` merging is handled by the - * method instead. The `customizer` is invoked with seven arguments: - * (objValue, srcValue, key, object, source, stack). - * - * **Note:** This method mutates `object`. + * Reduces a collection to a value which is the accumulated result of running + * each element in the collection through the callback, where each successive + * callback execution consumes the return value of the previous execution. If + * `accumulator` is not provided the first element of the collection will be + * used as the initial `accumulator` value. The callback is bound to `thisArg` + * and invoked with four arguments; (accumulator, value, index|key, collection). * * @static * @memberOf _ - * @category Object - * @param {Object} object The destination object. - * @param {...Object} sources The source objects. - * @param {Function} customizer The function to customize assigned values. - * @returns {Object} Returns `object`. + * @alias foldl, inject + * @category Collections + * @param {Array|Object|string} collection The collection to iterate over. + * @param {Function} [callback=identity] The function called per iteration. + * @param {*} [accumulator] Initial value of the accumulator. + * @param {*} [thisArg] The `this` binding of `callback`. + * @returns {*} Returns the accumulated value. * @example * - * function customizer(objValue, srcValue) { - * if (_.isArray(objValue)) { - * return objValue.concat(srcValue); - * } - * } - * - * var object = { - * 'fruits': ['apple'], - * 'vegetables': ['beet'] - * }; - * - * var other = { - * 'fruits': ['banana'], - * 'vegetables': ['carrot'] - * }; + * var sum = _.reduce([1, 2, 3], function(sum, num) { + * return sum + num; + * }); + * // => 6 * - * _.mergeWith(object, other, customizer); - * // => { 'fruits': ['apple', 'banana'], 'vegetables': ['beet', 'carrot'] } + * var mapped = _.reduce({ 'a': 1, 'b': 2, 'c': 3 }, function(result, num, key) { + * result[key] = num * 3; + * return result; + * }, {}); + * // => { 'a': 3, 'b': 6, 'c': 9 } */ - var mergeWith = createAssigner(function(object, source, srcIndex, customizer) { - baseMerge(object, source, srcIndex, customizer); - }); + function reduce(collection, callback, accumulator, thisArg) { + var noaccum = arguments.length < 3; + callback = lodash.createCallback(callback, thisArg, 4); - /** - * The opposite of `_.pick`; this method creates an object composed of the - * own and inherited enumerable properties of `object` that are not omitted. - * - * @static - * @memberOf _ - * @category Object - * @param {Object} object The source object. - * @param {...(string|string[])} [props] The property names to omit, specified - * individually or in arrays. - * @returns {Object} Returns the new object. - * @example - * - * var object = { 'a': 1, 'b': '2', 'c': 3 }; - * - * _.omit(object, ['a', 'c']); - * // => { 'b': '2' } - */ - var omit = rest(function(object, props) { - if (object == null) { - return {}; + if (isArray(collection)) { + var index = -1, + length = collection.length; + + if (noaccum) { + accumulator = collection[++index]; + } + while (++index < length) { + accumulator = callback(accumulator, collection[index], index, collection); + } + } else { + baseEach(collection, function(value, index, collection) { + accumulator = noaccum + ? (noaccum = false, value) + : callback(accumulator, value, index, collection) + }); } - props = arrayMap(baseFlatten(props, 1), String); - return basePick(object, baseDifference(keysIn(object), props)); - }); + return accumulator; + } /** - * The opposite of `_.pickBy`; this method creates an object composed of - * the own and inherited enumerable properties of `object` that `predicate` - * doesn't return truthy for. The predicate is invoked with two arguments: - * (value, key). + * This method is like `_.reduce` except that it iterates over elements + * of a `collection` from right to left. * * @static * @memberOf _ - * @category Object - * @param {Object} object The source object. - * @param {Function|Object|string} [predicate=_.identity] The function invoked per property. - * @returns {Object} Returns the new object. + * @alias foldr + * @category Collections + * @param {Array|Object|string} collection The collection to iterate over. + * @param {Function} [callback=identity] The function called per iteration. + * @param {*} [accumulator] Initial value of the accumulator. + * @param {*} [thisArg] The `this` binding of `callback`. + * @returns {*} Returns the accumulated value. * @example * - * var object = { 'a': 1, 'b': '2', 'c': 3 }; - * - * _.omitBy(object, _.isNumber); - * // => { 'b': '2' } + * var list = [[0, 1], [2, 3], [4, 5]]; + * var flat = _.reduceRight(list, function(a, b) { return a.concat(b); }, []); + * // => [4, 5, 2, 3, 0, 1] */ - function omitBy(object, predicate) { - predicate = getIteratee(predicate); - return basePickBy(object, function(value, key) { - return !predicate(value, key); + function reduceRight(collection, callback, accumulator, thisArg) { + var noaccum = arguments.length < 3; + callback = lodash.createCallback(callback, thisArg, 4); + forEachRight(collection, function(value, index, collection) { + accumulator = noaccum + ? (noaccum = false, value) + : callback(accumulator, value, index, collection); }); + return accumulator; } /** - * Creates an object composed of the picked `object` properties. - * - * @static - * @memberOf _ - * @category Object - * @param {Object} object The source object. - * @param {...(string|string[])} [props] The property names to pick, specified - * individually or in arrays. - * @returns {Object} Returns the new object. - * @example + * The opposite of `_.filter` this method returns the elements of a + * collection that the callback does **not** return truey for. * - * var object = { 'a': 1, 'b': '2', 'c': 3 }; + * If a property name is provided for `callback` the created "_.pluck" style + * callback will return the property value of the given element. * - * _.pick(object, ['a', 'c']); - * // => { 'a': 1, 'c': 3 } - */ - var pick = rest(function(object, props) { - return object == null ? {} : basePick(object, baseFlatten(props, 1)); - }); - - /** - * Creates an object composed of the `object` properties `predicate` returns - * truthy for. The predicate is invoked with two arguments: (value, key). + * If an object is provided for `callback` the created "_.where" style callback + * will return `true` for elements that have the properties of the given object, + * else `false`. * * @static * @memberOf _ - * @category Object - * @param {Object} object The source object. - * @param {Function|Object|string} [predicate=_.identity] The function invoked per property. - * @returns {Object} Returns the new object. + * @category Collections + * @param {Array|Object|string} collection The collection to iterate over. + * @param {Function|Object|string} [callback=identity] The function called + * per iteration. If a property name or object is provided it will be used + * to create a "_.pluck" or "_.where" style callback, respectively. + * @param {*} [thisArg] The `this` binding of `callback`. + * @returns {Array} Returns a new array of elements that failed the callback check. * @example * - * var object = { 'a': 1, 'b': '2', 'c': 3 }; + * var odds = _.reject([1, 2, 3, 4, 5, 6], function(num) { return num % 2 == 0; }); + * // => [1, 3, 5] + * + * var characters = [ + * { 'name': 'barney', 'age': 36, 'blocked': false }, + * { 'name': 'fred', 'age': 40, 'blocked': true } + * ]; + * + * // using "_.pluck" callback shorthand + * _.reject(characters, 'blocked'); + * // => [{ 'name': 'barney', 'age': 36, 'blocked': false }] * - * _.pickBy(object, _.isNumber); - * // => { 'a': 1, 'c': 3 } + * // using "_.where" callback shorthand + * _.reject(characters, { 'age': 36 }); + * // => [{ 'name': 'fred', 'age': 40, 'blocked': true }] */ - function pickBy(object, predicate) { - return object == null ? {} : basePickBy(object, getIteratee(predicate)); + function reject(collection, callback, thisArg) { + callback = lodash.createCallback(callback, thisArg, 3); + return filter(collection, function(value, index, collection) { + return !callback(value, index, collection); + }); } /** - * This method is like `_.get` except that if the resolved value is a function - * it's invoked with the `this` binding of its parent object and its result - * is returned. + * Retrieves a random element or `n` random elements from a collection. * * @static * @memberOf _ - * @category Object - * @param {Object} object The object to query. - * @param {Array|string} path The path of the property to resolve. - * @param {*} [defaultValue] The value returned if the resolved value is `undefined`. - * @returns {*} Returns the resolved value. + * @category Collections + * @param {Array|Object|string} collection The collection to sample. + * @param {number} [n] The number of elements to sample. + * @param- {Object} [guard] Allows working with functions like `_.map` + * without using their `index` arguments as `n`. + * @returns {Array} Returns the random sample(s) of `collection`. * @example * - * var object = { 'a': [{ 'b': { 'c1': 3, 'c2': _.constant(4) } }] }; - * - * _.result(object, 'a[0].b.c1'); - * // => 3 - * - * _.result(object, 'a[0].b.c2'); - * // => 4 - * - * _.result(object, 'a[0].b.c3', 'default'); - * // => 'default' + * _.sample([1, 2, 3, 4]); + * // => 2 * - * _.result(object, 'a[0].b.c3', _.constant('default')); - * // => 'default' + * _.sample([1, 2, 3, 4], 2); + * // => [3, 1] */ - function result(object, path, defaultValue) { - if (!isKey(path, object)) { - path = baseCastPath(path); - var result = get(object, path); - object = parent(object, path); - } else { - result = object == null ? undefined : object[path]; + function sample(collection, n, guard) { + if (collection && typeof collection.length != 'number') { + collection = values(collection); + } else if (support.unindexedChars && isString(collection)) { + collection = collection.split(''); } - if (result === undefined) { - result = defaultValue; + if (n == null || guard) { + return collection ? collection[baseRandom(0, collection.length - 1)] : undefined; } - return isFunction(result) ? result.call(object) : result; + var result = shuffle(collection); + result.length = nativeMin(nativeMax(0, n), result.length); + return result; } /** - * Sets the value at `path` of `object`. If a portion of `path` doesn't exist - * it's created. Arrays are created for missing index properties while objects - * are created for all other missing properties. Use `_.setWith` to customize - * `path` creation. - * - * **Note:** This method mutates `object`. + * Creates an array of shuffled values, using a version of the Fisher-Yates + * shuffle. See http://en.wikipedia.org/wiki/Fisher-Yates_shuffle. * * @static * @memberOf _ - * @category Object - * @param {Object} object The object to modify. - * @param {Array|string} path The path of the property to set. - * @param {*} value The value to set. - * @returns {Object} Returns `object`. + * @category Collections + * @param {Array|Object|string} collection The collection to shuffle. + * @returns {Array} Returns a new shuffled collection. * @example * - * var object = { 'a': [{ 'b': { 'c': 3 } }] }; - * - * _.set(object, 'a[0].b.c', 4); - * console.log(object.a[0].b.c); - * // => 4 - * - * _.set(object, 'x[0].y.z', 5); - * console.log(object.x[0].y.z); - * // => 5 + * _.shuffle([1, 2, 3, 4, 5, 6]); + * // => [4, 1, 6, 3, 5, 2] */ - function set(object, path, value) { - return object == null ? object : baseSet(object, path, value); + function shuffle(collection) { + var index = -1, + length = collection ? collection.length : 0, + result = Array(typeof length == 'number' ? length : 0); + + forEach(collection, function(value) { + var rand = baseRandom(0, ++index); + result[index] = result[rand]; + result[rand] = value; + }); + return result; } /** - * This method is like `_.set` except that it accepts `customizer` which is - * invoked to produce the objects of `path`. If `customizer` returns `undefined` - * path creation is handled by the method instead. The `customizer` is invoked - * with three arguments: (nsValue, key, nsObject). - * - * **Note:** This method mutates `object`. + * Gets the size of the `collection` by returning `collection.length` for arrays + * and array-like objects or the number of own enumerable properties for objects. * * @static * @memberOf _ - * @category Object - * @param {Object} object The object to modify. - * @param {Array|string} path The path of the property to set. - * @param {*} value The value to set. - * @param {Function} [customizer] The function to customize assigned values. - * @returns {Object} Returns `object`. + * @category Collections + * @param {Array|Object|string} collection The collection to inspect. + * @returns {number} Returns `collection.length` or number of own enumerable properties. * @example * - * var object = {}; + * _.size([1, 2]); + * // => 2 + * + * _.size({ 'one': 1, 'two': 2, 'three': 3 }); + * // => 3 * - * _.setWith(object, '[0][1]', 'a', Object); - * // => { '0': { '1': 'a' } } + * _.size('pebbles'); + * // => 7 */ - function setWith(object, path, value, customizer) { - customizer = typeof customizer == 'function' ? customizer : undefined; - return object == null ? object : baseSet(object, path, value, customizer); + function size(collection) { + var length = collection ? collection.length : 0; + return typeof length == 'number' ? length : keys(collection).length; } /** - * Creates an array of own enumerable key-value pairs for `object` which - * can be consumed by `_.fromPairs`. + * Checks if the callback returns a truey value for **any** element of a + * collection. The function returns as soon as it finds a passing value and + * does not iterate over the entire collection. The callback is bound to + * `thisArg` and invoked with three arguments; (value, index|key, collection). + * + * If a property name is provided for `callback` the created "_.pluck" style + * callback will return the property value of the given element. + * + * If an object is provided for `callback` the created "_.where" style callback + * will return `true` for elements that have the properties of the given object, + * else `false`. * * @static * @memberOf _ - * @category Object - * @param {Object} object The object to query. - * @returns {Array} Returns the new array of key-value pairs. + * @alias any + * @category Collections + * @param {Array|Object|string} collection The collection to iterate over. + * @param {Function|Object|string} [callback=identity] The function called + * per iteration. If a property name or object is provided it will be used + * to create a "_.pluck" or "_.where" style callback, respectively. + * @param {*} [thisArg] The `this` binding of `callback`. + * @returns {boolean} Returns `true` if any element passed the callback check, + * else `false`. * @example * - * function Foo() { - * this.a = 1; - * this.b = 2; - * } + * _.some([null, 0, 'yes', false], Boolean); + * // => true + * + * var characters = [ + * { 'name': 'barney', 'age': 36, 'blocked': false }, + * { 'name': 'fred', 'age': 40, 'blocked': true } + * ]; * - * Foo.prototype.c = 3; + * // using "_.pluck" callback shorthand + * _.some(characters, 'blocked'); + * // => true * - * _.toPairs(new Foo); - * // => [['a', 1], ['b', 2]] (iteration order is not guaranteed) + * // using "_.where" callback shorthand + * _.some(characters, { 'age': 1 }); + * // => false */ - function toPairs(object) { - return baseToPairs(object, keys(object)); + function some(collection, callback, thisArg) { + var result; + callback = lodash.createCallback(callback, thisArg, 3); + + if (isArray(collection)) { + var index = -1, + length = collection.length; + + while (++index < length) { + if ((result = callback(collection[index], index, collection))) { + break; + } + } + } else { + baseEach(collection, function(value, index, collection) { + return !(result = callback(value, index, collection)); + }); + } + return !!result; } /** - * Creates an array of own and inherited enumerable key-value pairs for - * `object` which can be consumed by `_.fromPairs`. - * - * @static - * @memberOf _ - * @category Object - * @param {Object} object The object to query. - * @returns {Array} Returns the new array of key-value pairs. - * @example + * Creates an array of elements, sorted in ascending order by the results of + * running each element in a collection through the callback. This method + * performs a stable sort, that is, it will preserve the original sort order + * of equal elements. The callback is bound to `thisArg` and invoked with + * three arguments; (value, index|key, collection). * - * function Foo() { - * this.a = 1; - * this.b = 2; - * } + * If a property name is provided for `callback` the created "_.pluck" style + * callback will return the property value of the given element. * - * Foo.prototype.c = 3; + * If an array of property names is provided for `callback` the collection + * will be sorted by each property value. * - * _.toPairsIn(new Foo); - * // => [['a', 1], ['b', 2], ['c', 1]] (iteration order is not guaranteed) - */ - function toPairsIn(object) { - return baseToPairs(object, keysIn(object)); - } - - /** - * An alternative to `_.reduce`; this method transforms `object` to a new - * `accumulator` object which is the result of running each of its own enumerable - * properties through `iteratee`, with each invocation potentially mutating - * the `accumulator` object. The iteratee is invoked with four arguments: - * (accumulator, value, key, object). Iteratee functions may exit iteration - * early by explicitly returning `false`. + * If an object is provided for `callback` the created "_.where" style callback + * will return `true` for elements that have the properties of the given object, + * else `false`. * * @static * @memberOf _ - * @category Object - * @param {Array|Object} object The object to iterate over. - * @param {Function} [iteratee=_.identity] The function invoked per iteration. - * @param {*} [accumulator] The custom accumulator value. - * @returns {*} Returns the accumulated value. + * @category Collections + * @param {Array|Object|string} collection The collection to iterate over. + * @param {Array|Function|Object|string} [callback=identity] The function called + * per iteration. If a property name or object is provided it will be used + * to create a "_.pluck" or "_.where" style callback, respectively. + * @param {*} [thisArg] The `this` binding of `callback`. + * @returns {Array} Returns a new array of sorted elements. * @example * - * _.transform([2, 3, 4], function(result, n) { - * result.push(n *= n); - * return n % 2 == 0; - * }, []); - * // => [4, 9] + * _.sortBy([1, 2, 3], function(num) { return Math.sin(num); }); + * // => [3, 1, 2] * - * _.transform({ 'a': 1, 'b': 2, 'c': 1 }, function(result, value, key) { - * (result[value] || (result[value] = [])).push(key); - * }, {}); - * // => { '1': ['a', 'c'], '2': ['b'] } + * _.sortBy([1, 2, 3], function(num) { return this.sin(num); }, Math); + * // => [3, 1, 2] + * + * var characters = [ + * { 'name': 'barney', 'age': 36 }, + * { 'name': 'fred', 'age': 40 }, + * { 'name': 'barney', 'age': 26 }, + * { 'name': 'fred', 'age': 30 } + * ]; + * + * // using "_.pluck" callback shorthand + * _.map(_.sortBy(characters, 'age'), _.values); + * // => [['barney', 26], ['fred', 30], ['barney', 36], ['fred', 40]] + * + * // sorting by multiple properties + * _.map(_.sortBy(characters, ['name', 'age']), _.values); + * // = > [['barney', 26], ['barney', 36], ['fred', 30], ['fred', 40]] */ - function transform(object, iteratee, accumulator) { - var isArr = isArray(object) || isTypedArray(object); - iteratee = getIteratee(iteratee, 4); + function sortBy(collection, callback, thisArg) { + var index = -1, + isArr = isArray(callback), + length = collection ? collection.length : 0, + result = Array(typeof length == 'number' ? length : 0); - if (accumulator == null) { - if (isArr || isObject(object)) { - var Ctor = object.constructor; - if (isArr) { - accumulator = isArray(object) ? new Ctor : []; - } else { - accumulator = isFunction(Ctor) ? baseCreate(getPrototypeOf(object)) : {}; - } + if (!isArr) { + callback = lodash.createCallback(callback, thisArg, 3); + } + forEach(collection, function(value, key, collection) { + var object = result[++index] = getObject(); + if (isArr) { + object.criteria = map(callback, function(key) { return value[key]; }); } else { - accumulator = {}; + (object.criteria = getArray())[0] = callback(value, key, collection); } - } - (isArr ? arrayEach : baseForOwn)(object, function(value, index, object) { - return iteratee(accumulator, value, index, object); + object.index = index; + object.value = value; }); - return accumulator; + + length = result.length; + result.sort(compareAscending); + while (length--) { + var object = result[length]; + result[length] = object.value; + if (!isArr) { + releaseArray(object.criteria); + } + releaseObject(object); + } + return result; } /** - * Removes the property at `path` of `object`. - * - * **Note:** This method mutates `object`. + * Converts the `collection` to an array. * * @static * @memberOf _ - * @category Object - * @param {Object} object The object to modify. - * @param {Array|string} path The path of the property to unset. - * @returns {boolean} Returns `true` if the property is deleted, else `false`. + * @category Collections + * @param {Array|Object|string} collection The collection to convert. + * @returns {Array} Returns the new converted array. * @example * - * var object = { 'a': [{ 'b': { 'c': 7 } }] }; - * _.unset(object, 'a[0].b.c'); - * // => true - * - * console.log(object); - * // => { 'a': [{ 'b': {} }] }; - * - * _.unset(object, 'a[0].b.c'); - * // => true - * - * console.log(object); - * // => { 'a': [{ 'b': {} }] }; + * (function() { return _.toArray(arguments).slice(1); })(1, 2, 3, 4); + * // => [2, 3, 4] */ - function unset(object, path) { - return object == null ? true : baseUnset(object, path); + function toArray(collection) { + if (collection && typeof collection.length == 'number') { + return (support.unindexedChars && isString(collection)) + ? collection.split('') + : slice(collection); + } + return values(collection); } /** - * This method is like `_.set` except that accepts `updater` to produce the - * value to set. Use `_.updateWith` to customize `path` creation. The `updater` - * is invoked with one argument: (value). - * - * **Note:** This method mutates `object`. + * Performs a deep comparison of each element in a `collection` to the given + * `properties` object, returning an array of all elements that have equivalent + * property values. * * @static * @memberOf _ - * @category Object - * @param {Object} object The object to modify. - * @param {Array|string} path The path of the property to set. - * @param {Function} updater The function to produce the updated value. - * @returns {Object} Returns `object`. + * @type Function + * @category Collections + * @param {Array|Object|string} collection The collection to iterate over. + * @param {Object} props The object of property values to filter by. + * @returns {Array} Returns a new array of elements that have the given properties. * @example * - * var object = { 'a': [{ 'b': { 'c': 3 } }] }; + * var characters = [ + * { 'name': 'barney', 'age': 36, 'pets': ['hoppy'] }, + * { 'name': 'fred', 'age': 40, 'pets': ['baby puss', 'dino'] } + * ]; * - * _.update(object, 'a[0].b.c', function(n) { return n * n; }); - * console.log(object.a[0].b.c); - * // => 9 + * _.where(characters, { 'age': 36 }); + * // => [{ 'name': 'barney', 'age': 36, 'pets': ['hoppy'] }] * - * _.update(object, 'x[0].y.z', function(n) { return n ? n + 1 : 0; }); - * console.log(object.x[0].y.z); - * // => 0 + * _.where(characters, { 'pets': ['dino'] }); + * // => [{ 'name': 'fred', 'age': 40, 'pets': ['baby puss', 'dino'] }] */ - function update(object, path, updater) { - return object == null ? object : baseUpdate(object, path, baseCastFunction(updater)); - } + var where = filter; + + /*--------------------------------------------------------------------------*/ /** - * This method is like `_.update` except that it accepts `customizer` which is - * invoked to produce the objects of `path`. If `customizer` returns `undefined` - * path creation is handled by the method instead. The `customizer` is invoked - * with three arguments: (nsValue, key, nsObject). - * - * **Note:** This method mutates `object`. + * Creates an array with all falsey values removed. The values `false`, `null`, + * `0`, `""`, `undefined`, and `NaN` are all falsey. * * @static * @memberOf _ - * @category Object - * @param {Object} object The object to modify. - * @param {Array|string} path The path of the property to set. - * @param {Function} updater The function to produce the updated value. - * @param {Function} [customizer] The function to customize assigned values. - * @returns {Object} Returns `object`. + * @category Arrays + * @param {Array} array The array to compact. + * @returns {Array} Returns a new array of filtered values. * @example * - * var object = {}; - * - * _.updateWith(object, '[0][1]', _.constant('a'), Object); - * // => { '0': { '1': 'a' } } + * _.compact([0, 1, false, 2, '', 3]); + * // => [1, 2, 3] */ - function updateWith(object, path, updater, customizer) { - customizer = typeof customizer == 'function' ? customizer : undefined; - return object == null ? object : baseUpdate(object, path, baseCastFunction(updater), customizer); + function compact(array) { + var index = -1, + length = array ? array.length : 0, + result = []; + + while (++index < length) { + var value = array[index]; + if (value) { + result.push(value); + } + } + return result; } /** - * Creates an array of the own enumerable property values of `object`. - * - * **Note:** Non-object values are coerced to objects. + * Creates an array excluding all values of the provided arrays using strict + * equality for comparisons, i.e. `===`. * * @static * @memberOf _ - * @category Object - * @param {Object} object The object to query. - * @returns {Array} Returns the array of property values. + * @category Arrays + * @param {Array} array The array to process. + * @param {...Array} [values] The arrays of values to exclude. + * @returns {Array} Returns a new array of filtered values. * @example * - * function Foo() { - * this.a = 1; - * this.b = 2; - * } - * - * Foo.prototype.c = 3; - * - * _.values(new Foo); - * // => [1, 2] (iteration order is not guaranteed) - * - * _.values('hi'); - * // => ['h', 'i'] + * _.difference([1, 2, 3, 4, 5], [5, 2, 10]); + * // => [1, 3, 4] */ - function values(object) { - return object ? baseValues(object, keys(object)) : []; + function difference(array) { + return baseDifference(array, baseFlatten(arguments, true, true, 1)); } /** - * Creates an array of the own and inherited enumerable property values of `object`. + * This method is like `_.find` except that it returns the index of the first + * element that passes the callback check, instead of the element itself. * - * **Note:** Non-object values are coerced to objects. + * If a property name is provided for `callback` the created "_.pluck" style + * callback will return the property value of the given element. + * + * If an object is provided for `callback` the created "_.where" style callback + * will return `true` for elements that have the properties of the given object, + * else `false`. * * @static * @memberOf _ - * @category Object - * @param {Object} object The object to query. - * @returns {Array} Returns the array of property values. + * @category Arrays + * @param {Array} array The array to search. + * @param {Function|Object|string} [callback=identity] The function called + * per iteration. If a property name or object is provided it will be used + * to create a "_.pluck" or "_.where" style callback, respectively. + * @param {*} [thisArg] The `this` binding of `callback`. + * @returns {number} Returns the index of the found element, else `-1`. * @example * - * function Foo() { - * this.a = 1; - * this.b = 2; - * } + * var characters = [ + * { 'name': 'barney', 'age': 36, 'blocked': false }, + * { 'name': 'fred', 'age': 40, 'blocked': true }, + * { 'name': 'pebbles', 'age': 1, 'blocked': false } + * ]; + * + * _.findIndex(characters, function(chr) { + * return chr.age < 20; + * }); + * // => 2 * - * Foo.prototype.c = 3; + * // using "_.where" callback shorthand + * _.findIndex(characters, { 'age': 36 }); + * // => 0 * - * _.valuesIn(new Foo); - * // => [1, 2, 3] (iteration order is not guaranteed) + * // using "_.pluck" callback shorthand + * _.findIndex(characters, 'blocked'); + * // => 1 */ - function valuesIn(object) { - return object == null ? [] : baseValues(object, keysIn(object)); - } + function findIndex(array, callback, thisArg) { + var index = -1, + length = array ? array.length : 0; - /*------------------------------------------------------------------------*/ + callback = lodash.createCallback(callback, thisArg, 3); + while (++index < length) { + if (callback(array[index], index, array)) { + return index; + } + } + return -1; + } /** - * Clamps `number` within the inclusive `lower` and `upper` bounds. + * This method is like `_.findIndex` except that it iterates over elements + * of a `collection` from right to left. + * + * If a property name is provided for `callback` the created "_.pluck" style + * callback will return the property value of the given element. + * + * If an object is provided for `callback` the created "_.where" style callback + * will return `true` for elements that have the properties of the given object, + * else `false`. * * @static * @memberOf _ - * @category Number - * @param {number} number The number to clamp. - * @param {number} [lower] The lower bound. - * @param {number} upper The upper bound. - * @returns {number} Returns the clamped number. + * @category Arrays + * @param {Array} array The array to search. + * @param {Function|Object|string} [callback=identity] The function called + * per iteration. If a property name or object is provided it will be used + * to create a "_.pluck" or "_.where" style callback, respectively. + * @param {*} [thisArg] The `this` binding of `callback`. + * @returns {number} Returns the index of the found element, else `-1`. * @example * - * _.clamp(-10, -5, 5); - * // => -5 + * var characters = [ + * { 'name': 'barney', 'age': 36, 'blocked': true }, + * { 'name': 'fred', 'age': 40, 'blocked': false }, + * { 'name': 'pebbles', 'age': 1, 'blocked': true } + * ]; + * + * _.findLastIndex(characters, function(chr) { + * return chr.age > 30; + * }); + * // => 1 + * + * // using "_.where" callback shorthand + * _.findLastIndex(characters, { 'age': 36 }); + * // => 0 * - * _.clamp(10, -5, 5); - * // => 5 + * // using "_.pluck" callback shorthand + * _.findLastIndex(characters, 'blocked'); + * // => 2 */ - function clamp(number, lower, upper) { - if (upper === undefined) { - upper = lower; - lower = undefined; - } - if (upper !== undefined) { - upper = toNumber(upper); - upper = upper === upper ? upper : 0; - } - if (lower !== undefined) { - lower = toNumber(lower); - lower = lower === lower ? lower : 0; + function findLastIndex(array, callback, thisArg) { + var length = array ? array.length : 0; + callback = lodash.createCallback(callback, thisArg, 3); + while (length--) { + if (callback(array[length], length, array)) { + return length; + } } - return baseClamp(toNumber(number), lower, upper); + return -1; } /** - * Checks if `n` is between `start` and up to but not including, `end`. If - * `end` is not specified it's set to `start` with `start` then set to `0`. - * If `start` is greater than `end` the params are swapped to support - * negative ranges. + * Gets the first element or first `n` elements of an array. If a callback + * is provided elements at the beginning of the array are returned as long + * as the callback returns truey. The callback is bound to `thisArg` and + * invoked with three arguments; (value, index, array). + * + * If a property name is provided for `callback` the created "_.pluck" style + * callback will return the property value of the given element. + * + * If an object is provided for `callback` the created "_.where" style callback + * will return `true` for elements that have the properties of the given object, + * else `false`. * * @static * @memberOf _ - * @category Number - * @param {number} number The number to check. - * @param {number} [start=0] The start of the range. - * @param {number} end The end of the range. - * @returns {boolean} Returns `true` if `number` is in the range, else `false`. + * @alias head, take + * @category Arrays + * @param {Array} array The array to query. + * @param {Function|Object|number|string} [callback] The function called + * per element or the number of elements to return. If a property name or + * object is provided it will be used to create a "_.pluck" or "_.where" + * style callback, respectively. + * @param {*} [thisArg] The `this` binding of `callback`. + * @returns {*} Returns the first element(s) of `array`. * @example * - * _.inRange(3, 2, 4); - * // => true - * - * _.inRange(4, 8); - * // => true + * _.first([1, 2, 3]); + * // => 1 * - * _.inRange(4, 2); - * // => false + * _.first([1, 2, 3], 2); + * // => [1, 2] * - * _.inRange(2, 2); - * // => false + * _.first([1, 2, 3], function(num) { + * return num < 3; + * }); + * // => [1, 2] * - * _.inRange(1.2, 2); - * // => true + * var characters = [ + * { 'name': 'barney', 'blocked': true, 'employer': 'slate' }, + * { 'name': 'fred', 'blocked': false, 'employer': 'slate' }, + * { 'name': 'pebbles', 'blocked': true, 'employer': 'na' } + * ]; * - * _.inRange(5.2, 4); - * // => false + * // using "_.pluck" callback shorthand + * _.first(characters, 'blocked'); + * // => [{ 'name': 'barney', 'blocked': true, 'employer': 'slate' }] * - * _.inRange(-3, -2, -6); - * // => true + * // using "_.where" callback shorthand + * _.pluck(_.first(characters, { 'employer': 'slate' }), 'name'); + * // => ['barney', 'fred'] */ - function inRange(number, start, end) { - start = toNumber(start) || 0; - if (end === undefined) { - end = start; - start = 0; + function first(array, callback, thisArg) { + var n = 0, + length = array ? array.length : 0; + + if (typeof callback != 'number' && callback != null) { + var index = -1; + callback = lodash.createCallback(callback, thisArg, 3); + while (++index < length && callback(array[index], index, array)) { + n++; + } } else { - end = toNumber(end) || 0; + n = callback; + if (n == null || thisArg) { + return array ? array[0] : undefined; + } } - number = toNumber(number); - return baseInRange(number, start, end); + return slice(array, 0, nativeMin(nativeMax(0, n), length)); } /** - * Produces a random number between the inclusive `lower` and `upper` bounds. - * If only one argument is provided a number between `0` and the given number - * is returned. If `floating` is `true`, or either `lower` or `upper` are floats, - * a floating-point number is returned instead of an integer. + * Flattens a nested array (the nesting can be to any depth). If `isShallow` + * is truey, the array will only be flattened a single level. If a callback + * is provided each element of the array is passed through the callback before + * flattening. The callback is bound to `thisArg` and invoked with three + * arguments; (value, index, array). * - * **Note:** JavaScript follows the IEEE-754 standard for resolving - * floating-point values which can produce unexpected results. + * If a property name is provided for `callback` the created "_.pluck" style + * callback will return the property value of the given element. + * + * If an object is provided for `callback` the created "_.where" style callback + * will return `true` for elements that have the properties of the given object, + * else `false`. * * @static * @memberOf _ - * @category Number - * @param {number} [lower=0] The lower bound. - * @param {number} [upper=1] The upper bound. - * @param {boolean} [floating] Specify returning a floating-point number. - * @returns {number} Returns the random number. + * @category Arrays + * @param {Array} array The array to flatten. + * @param {boolean} [isShallow=false] A flag to restrict flattening to a single level. + * @param {Function|Object|string} [callback=identity] The function called + * per iteration. If a property name or object is provided it will be used + * to create a "_.pluck" or "_.where" style callback, respectively. + * @param {*} [thisArg] The `this` binding of `callback`. + * @returns {Array} Returns a new flattened array. * @example * - * _.random(0, 5); - * // => an integer between 0 and 5 + * _.flatten([1, [2], [3, [[4]]]]); + * // => [1, 2, 3, 4]; * - * _.random(5); - * // => also an integer between 0 and 5 + * _.flatten([1, [2], [3, [[4]]]], true); + * // => [1, 2, 3, [[4]]]; * - * _.random(5, true); - * // => a floating-point number between 0 and 5 + * var characters = [ + * { 'name': 'barney', 'age': 30, 'pets': ['hoppy'] }, + * { 'name': 'fred', 'age': 40, 'pets': ['baby puss', 'dino'] } + * ]; * - * _.random(1.2, 5.2); - * // => a floating-point number between 1.2 and 5.2 + * // using "_.pluck" callback shorthand + * _.flatten(characters, 'pets'); + * // => ['hoppy', 'baby puss', 'dino'] */ - function random(lower, upper, floating) { - if (floating && typeof floating != 'boolean' && isIterateeCall(lower, upper, floating)) { - upper = floating = undefined; - } - if (floating === undefined) { - if (typeof upper == 'boolean') { - floating = upper; - upper = undefined; - } - else if (typeof lower == 'boolean') { - floating = lower; - lower = undefined; - } - } - if (lower === undefined && upper === undefined) { - lower = 0; - upper = 1; - } - else { - lower = toNumber(lower) || 0; - if (upper === undefined) { - upper = lower; - lower = 0; - } else { - upper = toNumber(upper) || 0; - } - } - if (lower > upper) { - var temp = lower; - lower = upper; - upper = temp; + function flatten(array, isShallow, callback, thisArg) { + // juggle arguments + if (typeof isShallow != 'boolean' && isShallow != null) { + thisArg = callback; + callback = (typeof isShallow != 'function' && thisArg && thisArg[isShallow] === array) ? null : isShallow; + isShallow = false; } - if (floating || lower % 1 || upper % 1) { - var rand = nativeRandom(); - return nativeMin(lower + (rand * (upper - lower + freeParseFloat('1e-' + ((rand + '').length - 1)))), upper); + if (callback != null) { + array = map(array, callback, thisArg); } - return baseRandom(lower, upper); + return baseFlatten(array, isShallow); } - /*------------------------------------------------------------------------*/ - /** - * Converts `string` to [camel case](https://en.wikipedia.org/wiki/CamelCase). + * Gets the index at which the first occurrence of `value` is found using + * strict equality for comparisons, i.e. `===`. If the array is already sorted + * providing `true` for `fromIndex` will run a faster binary search. * * @static * @memberOf _ - * @category String - * @param {string} [string=''] The string to convert. - * @returns {string} Returns the camel cased string. + * @category Arrays + * @param {Array} array The array to search. + * @param {*} value The value to search for. + * @param {boolean|number} [fromIndex=0] The index to search from or `true` + * to perform a binary search on a sorted array. + * @returns {number} Returns the index of the matched value or `-1`. * @example * - * _.camelCase('Foo Bar'); - * // => 'fooBar' + * _.indexOf([1, 2, 3, 1, 2, 3], 2); + * // => 1 * - * _.camelCase('--foo-bar'); - * // => 'fooBar' + * _.indexOf([1, 2, 3, 1, 2, 3], 2, 3); + * // => 4 * - * _.camelCase('__foo_bar__'); - * // => 'fooBar' + * _.indexOf([1, 1, 2, 2, 3, 3], 2, true); + * // => 2 */ - var camelCase = createCompounder(function(result, word, index) { - word = word.toLowerCase(); - return result + (index ? capitalize(word) : word); - }); + function indexOf(array, value, fromIndex) { + if (typeof fromIndex == 'number') { + var length = array ? array.length : 0; + fromIndex = (fromIndex < 0 ? nativeMax(0, length + fromIndex) : fromIndex || 0); + } else if (fromIndex) { + var index = sortedIndex(array, value); + return array[index] === value ? index : -1; + } + return baseIndexOf(array, value, fromIndex); + } /** - * Converts the first character of `string` to upper case and the remaining - * to lower case. + * Gets all but the last element or last `n` elements of an array. If a + * callback is provided elements at the end of the array are excluded from + * the result as long as the callback returns truey. The callback is bound + * to `thisArg` and invoked with three arguments; (value, index, array). * - * @static - * @memberOf _ - * @category String - * @param {string} [string=''] The string to capitalize. - * @returns {string} Returns the capitalized string. - * @example + * If a property name is provided for `callback` the created "_.pluck" style + * callback will return the property value of the given element. * - * _.capitalize('FRED'); - * // => 'Fred' - */ - function capitalize(string) { - return upperFirst(toString(string).toLowerCase()); - } - - /** - * Deburrs `string` by converting [latin-1 supplementary letters](https://en.wikipedia.org/wiki/Latin-1_Supplement_(Unicode_block)#Character_table) - * to basic latin letters and removing [combining diacritical marks](https://en.wikipedia.org/wiki/Combining_Diacritical_Marks). + * If an object is provided for `callback` the created "_.where" style callback + * will return `true` for elements that have the properties of the given object, + * else `false`. * * @static * @memberOf _ - * @category String - * @param {string} [string=''] The string to deburr. - * @returns {string} Returns the deburred string. + * @category Arrays + * @param {Array} array The array to query. + * @param {Function|Object|number|string} [callback=1] The function called + * per element or the number of elements to exclude. If a property name or + * object is provided it will be used to create a "_.pluck" or "_.where" + * style callback, respectively. + * @param {*} [thisArg] The `this` binding of `callback`. + * @returns {Array} Returns a slice of `array`. * @example * - * _.deburr('déjà vu'); - * // => 'deja vu' - */ - function deburr(string) { - string = toString(string); - return string && string.replace(reLatin1, deburrLetter).replace(reComboMark, ''); - } - - /** - * Checks if `string` ends with the given target string. + * _.initial([1, 2, 3]); + * // => [1, 2] * - * @static - * @memberOf _ - * @category String - * @param {string} [string=''] The string to search. - * @param {string} [target] The string to search for. - * @param {number} [position=string.length] The position to search from. - * @returns {boolean} Returns `true` if `string` ends with `target`, else `false`. - * @example + * _.initial([1, 2, 3], 2); + * // => [1] * - * _.endsWith('abc', 'c'); - * // => true + * _.initial([1, 2, 3], function(num) { + * return num > 1; + * }); + * // => [1] * - * _.endsWith('abc', 'b'); - * // => false + * var characters = [ + * { 'name': 'barney', 'blocked': false, 'employer': 'slate' }, + * { 'name': 'fred', 'blocked': true, 'employer': 'slate' }, + * { 'name': 'pebbles', 'blocked': true, 'employer': 'na' } + * ]; * - * _.endsWith('abc', 'b', 2); - * // => true + * // using "_.pluck" callback shorthand + * _.initial(characters, 'blocked'); + * // => [{ 'name': 'barney', 'blocked': false, 'employer': 'slate' }] + * + * // using "_.where" callback shorthand + * _.pluck(_.initial(characters, { 'employer': 'na' }), 'name'); + * // => ['barney', 'fred'] */ - function endsWith(string, target, position) { - string = toString(string); - target = typeof target == 'string' ? target : (target + ''); - - var length = string.length; - position = position === undefined - ? length - : baseClamp(toInteger(position), 0, length); + function initial(array, callback, thisArg) { + var n = 0, + length = array ? array.length : 0; - position -= target.length; - return position >= 0 && string.indexOf(target, position) == position; + if (typeof callback != 'number' && callback != null) { + var index = length; + callback = lodash.createCallback(callback, thisArg, 3); + while (index-- && callback(array[index], index, array)) { + n++; + } + } else { + n = (callback == null || thisArg) ? 1 : callback || n; + } + return slice(array, 0, nativeMin(nativeMax(0, length - n), length)); } /** - * Converts the characters "&", "<", ">", '"', "'", and "\`" in `string` to - * their corresponding HTML entities. - * - * **Note:** No other characters are escaped. To escape additional - * characters use a third-party library like [_he_](https://mths.be/he). - * - * Though the ">" character is escaped for symmetry, characters like - * ">" and "/" don't need escaping in HTML and have no special meaning - * unless they're part of a tag or unquoted attribute value. - * See [Mathias Bynens's article](https://mathiasbynens.be/notes/ambiguous-ampersands) - * (under "semi-related fun fact") for more details. - * - * Backticks are escaped because in IE < 9, they can break out of - * attribute values or HTML comments. See [#59](https://html5sec.org/#59), - * [#102](https://html5sec.org/#102), [#108](https://html5sec.org/#108), and - * [#133](https://html5sec.org/#133) of the [HTML5 Security Cheatsheet](https://html5sec.org/) - * for more details. - * - * When working with HTML you should always [quote attribute values](http://wonko.com/post/html-escaping) - * to reduce XSS vectors. + * Creates an array of unique values present in all provided arrays using + * strict equality for comparisons, i.e. `===`. * * @static * @memberOf _ - * @category String - * @param {string} [string=''] The string to escape. - * @returns {string} Returns the escaped string. + * @category Arrays + * @param {...Array} [array] The arrays to inspect. + * @returns {Array} Returns an array of shared values. * @example * - * _.escape('fred, barney, & pebbles'); - * // => 'fred, barney, & pebbles' + * _.intersection([1, 2, 3], [5, 2, 1, 4], [2, 1]); + * // => [1, 2] */ - function escape(string) { - string = toString(string); - return (string && reHasUnescapedHtml.test(string)) - ? string.replace(reUnescapedHtml, escapeHtmlChar) - : string; + function intersection() { + var args = [], + argsIndex = -1, + argsLength = arguments.length, + caches = getArray(), + indexOf = getIndexOf(), + trustIndexOf = indexOf === baseIndexOf, + seen = getArray(); + + while (++argsIndex < argsLength) { + var value = arguments[argsIndex]; + if (isArray(value) || isArguments(value)) { + args.push(value); + caches.push(trustIndexOf && value.length >= largeArraySize && + createCache(argsIndex ? args[argsIndex] : seen)); + } + } + var array = args[0], + index = -1, + length = array ? array.length : 0, + result = []; + + outer: + while (++index < length) { + var cache = caches[0]; + value = array[index]; + + if ((cache ? cacheIndexOf(cache, value) : indexOf(seen, value)) < 0) { + argsIndex = argsLength; + (cache || seen).push(value); + while (--argsIndex) { + cache = caches[argsIndex]; + if ((cache ? cacheIndexOf(cache, value) : indexOf(args[argsIndex], value)) < 0) { + continue outer; + } + } + result.push(value); + } + } + while (argsLength--) { + cache = caches[argsLength]; + if (cache) { + releaseObject(cache); + } + } + releaseArray(caches); + releaseArray(seen); + return result; } /** - * Escapes the `RegExp` special characters "^", "$", "\", ".", "*", "+", - * "?", "(", ")", "[", "]", "{", "}", and "|" in `string`. + * Gets the last element or last `n` elements of an array. If a callback is + * provided elements at the end of the array are returned as long as the + * callback returns truey. The callback is bound to `thisArg` and invoked + * with three arguments; (value, index, array). * - * @static - * @memberOf _ - * @category String - * @param {string} [string=''] The string to escape. - * @returns {string} Returns the escaped string. - * @example + * If a property name is provided for `callback` the created "_.pluck" style + * callback will return the property value of the given element. * - * _.escapeRegExp('[lodash](https://lodash.com/)'); - * // => '\[lodash\]\(https://lodash\.com/\)' - */ - function escapeRegExp(string) { - string = toString(string); - return (string && reHasRegExpChar.test(string)) - ? string.replace(reRegExpChar, '\\$&') - : string; - } - - /** - * Converts `string` to [kebab case](https://en.wikipedia.org/wiki/Letter_case#Special_case_styles). + * If an object is provided for `callback` the created "_.where" style callback + * will return `true` for elements that have the properties of the given object, + * else `false`. * * @static * @memberOf _ - * @category String - * @param {string} [string=''] The string to convert. - * @returns {string} Returns the kebab cased string. + * @category Arrays + * @param {Array} array The array to query. + * @param {Function|Object|number|string} [callback] The function called + * per element or the number of elements to return. If a property name or + * object is provided it will be used to create a "_.pluck" or "_.where" + * style callback, respectively. + * @param {*} [thisArg] The `this` binding of `callback`. + * @returns {*} Returns the last element(s) of `array`. * @example * - * _.kebabCase('Foo Bar'); - * // => 'foo-bar' + * _.last([1, 2, 3]); + * // => 3 + * + * _.last([1, 2, 3], 2); + * // => [2, 3] + * + * _.last([1, 2, 3], function(num) { + * return num > 1; + * }); + * // => [2, 3] + * + * var characters = [ + * { 'name': 'barney', 'blocked': false, 'employer': 'slate' }, + * { 'name': 'fred', 'blocked': true, 'employer': 'slate' }, + * { 'name': 'pebbles', 'blocked': true, 'employer': 'na' } + * ]; * - * _.kebabCase('fooBar'); - * // => 'foo-bar' + * // using "_.pluck" callback shorthand + * _.pluck(_.last(characters, 'blocked'), 'name'); + * // => ['fred', 'pebbles'] * - * _.kebabCase('__foo_bar__'); - * // => 'foo-bar' + * // using "_.where" callback shorthand + * _.last(characters, { 'employer': 'na' }); + * // => [{ 'name': 'pebbles', 'blocked': true, 'employer': 'na' }] */ - var kebabCase = createCompounder(function(result, word, index) { - return result + (index ? '-' : '') + word.toLowerCase(); - }); + function last(array, callback, thisArg) { + var n = 0, + length = array ? array.length : 0; + + if (typeof callback != 'number' && callback != null) { + var index = length; + callback = lodash.createCallback(callback, thisArg, 3); + while (index-- && callback(array[index], index, array)) { + n++; + } + } else { + n = callback; + if (n == null || thisArg) { + return array ? array[length - 1] : undefined; + } + } + return slice(array, nativeMax(0, length - n)); + } /** - * Converts `string`, as space separated words, to lower case. + * Gets the index at which the last occurrence of `value` is found using strict + * equality for comparisons, i.e. `===`. If `fromIndex` is negative, it is used + * as the offset from the end of the collection. + * + * If a property name is provided for `callback` the created "_.pluck" style + * callback will return the property value of the given element. + * + * If an object is provided for `callback` the created "_.where" style callback + * will return `true` for elements that have the properties of the given object, + * else `false`. * * @static * @memberOf _ - * @category String - * @param {string} [string=''] The string to convert. - * @returns {string} Returns the lower cased string. + * @category Arrays + * @param {Array} array The array to search. + * @param {*} value The value to search for. + * @param {number} [fromIndex=array.length-1] The index to search from. + * @returns {number} Returns the index of the matched value or `-1`. * @example * - * _.lowerCase('--Foo-Bar'); - * // => 'foo bar' - * - * _.lowerCase('fooBar'); - * // => 'foo bar' + * _.lastIndexOf([1, 2, 3, 1, 2, 3], 2); + * // => 4 * - * _.lowerCase('__FOO_BAR__'); - * // => 'foo bar' + * _.lastIndexOf([1, 2, 3, 1, 2, 3], 2, 3); + * // => 1 */ - var lowerCase = createCompounder(function(result, word, index) { - return result + (index ? ' ' : '') + word.toLowerCase(); - }); + function lastIndexOf(array, value, fromIndex) { + var index = array ? array.length : 0; + if (typeof fromIndex == 'number') { + index = (fromIndex < 0 ? nativeMax(0, index + fromIndex) : nativeMin(fromIndex, index - 1)) + 1; + } + while (index--) { + if (array[index] === value) { + return index; + } + } + return -1; + } /** - * Converts the first character of `string` to lower case. + * Removes all provided values from the given array using strict equality for + * comparisons, i.e. `===`. * * @static * @memberOf _ - * @category String - * @param {string} [string=''] The string to convert. - * @returns {string} Returns the converted string. + * @category Arrays + * @param {Array} array The array to modify. + * @param {...*} [value] The values to remove. + * @returns {Array} Returns `array`. * @example * - * _.lowerFirst('Fred'); - * // => 'fred' - * - * _.lowerFirst('FRED'); - * // => 'fRED' + * var array = [1, 2, 3, 1, 2, 3]; + * _.pull(array, 2, 3); + * console.log(array); + * // => [1, 1] */ - var lowerFirst = createCaseFirst('toLowerCase'); + function pull(array) { + var args = arguments, + argsIndex = 0, + argsLength = args.length, + length = array ? array.length : 0; + + while (++argsIndex < argsLength) { + var index = -1, + value = args[argsIndex]; + while (++index < length) { + if (array[index] === value) { + splice.call(array, index--, 1); + length--; + } + } + } + return array; + } /** - * Converts the first character of `string` to upper case. + * Creates an array of numbers (positive and/or negative) progressing from + * `start` up to but not including `end`. If `start` is less than `stop` a + * zero-length range is created unless a negative `step` is specified. * * @static * @memberOf _ - * @category String - * @param {string} [string=''] The string to convert. - * @returns {string} Returns the converted string. + * @category Arrays + * @param {number} [start=0] The start of the range. + * @param {number} end The end of the range. + * @param {number} [step=1] The value to increment or decrement by. + * @returns {Array} Returns a new range array. * @example * - * _.upperFirst('fred'); - * // => 'Fred' + * _.range(4); + * // => [0, 1, 2, 3] * - * _.upperFirst('FRED'); - * // => 'FRED' - */ - var upperFirst = createCaseFirst('toUpperCase'); - - /** - * Pads `string` on the left and right sides if it's shorter than `length`. - * Padding characters are truncated if they can't be evenly divided by `length`. + * _.range(1, 5); + * // => [1, 2, 3, 4] * - * @static - * @memberOf _ - * @category String - * @param {string} [string=''] The string to pad. - * @param {number} [length=0] The padding length. - * @param {string} [chars=' '] The string used as padding. - * @returns {string} Returns the padded string. - * @example + * _.range(0, 20, 5); + * // => [0, 5, 10, 15] * - * _.pad('abc', 8); - * // => ' abc ' + * _.range(0, -4, -1); + * // => [0, -1, -2, -3] * - * _.pad('abc', 8, '_-'); - * // => '_-abc_-_' + * _.range(1, 4, 0); + * // => [1, 1, 1] * - * _.pad('abc', 3); - * // => 'abc' + * _.range(0); + * // => [] */ - function pad(string, length, chars) { - string = toString(string); - length = toInteger(length); + function range(start, end, step) { + start = +start || 0; + step = typeof step == 'number' ? step : (+step || 1); - var strLength = stringSize(string); - if (!length || strLength >= length) { - return string; + if (end == null) { + end = start; + start = 0; } - var mid = (length - strLength) / 2, - leftLength = nativeFloor(mid), - rightLength = nativeCeil(mid); + // use `Array(length)` so engines like Chakra and V8 avoid slower modes + // http://youtu.be/XAqIpGU8ZZk#t=17m25s + var index = -1, + length = nativeMax(0, ceil((end - start) / (step || 1))), + result = Array(length); - return createPadding('', leftLength, chars) + string + createPadding('', rightLength, chars); + while (++index < length) { + result[index] = start; + start += step; + } + return result; } /** - * Pads `string` on the right side if it's shorter than `length`. Padding - * characters are truncated if they exceed `length`. + * Removes all elements from an array that the callback returns truey for + * and returns an array of removed elements. The callback is bound to `thisArg` + * and invoked with three arguments; (value, index, array). + * + * If a property name is provided for `callback` the created "_.pluck" style + * callback will return the property value of the given element. + * + * If an object is provided for `callback` the created "_.where" style callback + * will return `true` for elements that have the properties of the given object, + * else `false`. * * @static * @memberOf _ - * @category String - * @param {string} [string=''] The string to pad. - * @param {number} [length=0] The padding length. - * @param {string} [chars=' '] The string used as padding. - * @returns {string} Returns the padded string. + * @category Arrays + * @param {Array} array The array to modify. + * @param {Function|Object|string} [callback=identity] The function called + * per iteration. If a property name or object is provided it will be used + * to create a "_.pluck" or "_.where" style callback, respectively. + * @param {*} [thisArg] The `this` binding of `callback`. + * @returns {Array} Returns a new array of removed elements. * @example * - * _.padEnd('abc', 6); - * // => 'abc ' + * var array = [1, 2, 3, 4, 5, 6]; + * var evens = _.remove(array, function(num) { return num % 2 == 0; }); * - * _.padEnd('abc', 6, '_-'); - * // => 'abc_-_' + * console.log(array); + * // => [1, 3, 5] * - * _.padEnd('abc', 3); - * // => 'abc' + * console.log(evens); + * // => [2, 4, 6] */ - function padEnd(string, length, chars) { - string = toString(string); - return string + createPadding(string, length, chars); + function remove(array, callback, thisArg) { + var index = -1, + length = array ? array.length : 0, + result = []; + + callback = lodash.createCallback(callback, thisArg, 3); + while (++index < length) { + var value = array[index]; + if (callback(value, index, array)) { + result.push(value); + splice.call(array, index--, 1); + length--; + } + } + return result; } /** - * Pads `string` on the left side if it's shorter than `length`. Padding - * characters are truncated if they exceed `length`. + * The opposite of `_.initial` this method gets all but the first element or + * first `n` elements of an array. If a callback function is provided elements + * at the beginning of the array are excluded from the result as long as the + * callback returns truey. The callback is bound to `thisArg` and invoked + * with three arguments; (value, index, array). + * + * If a property name is provided for `callback` the created "_.pluck" style + * callback will return the property value of the given element. + * + * If an object is provided for `callback` the created "_.where" style callback + * will return `true` for elements that have the properties of the given object, + * else `false`. * * @static * @memberOf _ - * @category String - * @param {string} [string=''] The string to pad. - * @param {number} [length=0] The padding length. - * @param {string} [chars=' '] The string used as padding. - * @returns {string} Returns the padded string. + * @alias drop, tail + * @category Arrays + * @param {Array} array The array to query. + * @param {Function|Object|number|string} [callback=1] The function called + * per element or the number of elements to exclude. If a property name or + * object is provided it will be used to create a "_.pluck" or "_.where" + * style callback, respectively. + * @param {*} [thisArg] The `this` binding of `callback`. + * @returns {Array} Returns a slice of `array`. * @example * - * _.padStart('abc', 6); - * // => ' abc' - * - * _.padStart('abc', 6, '_-'); - * // => '_-_abc' + * _.rest([1, 2, 3]); + * // => [2, 3] * - * _.padStart('abc', 3); - * // => 'abc' - */ - function padStart(string, length, chars) { - string = toString(string); - return createPadding(string, length, chars) + string; - } - - /** - * Converts `string` to an integer of the specified radix. If `radix` is - * `undefined` or `0`, a `radix` of `10` is used unless `value` is a hexadecimal, - * in which case a `radix` of `16` is used. + * _.rest([1, 2, 3], 2); + * // => [3] * - * **Note:** This method aligns with the [ES5 implementation](https://es5.github.io/#x15.1.2.2) - * of `parseInt`. + * _.rest([1, 2, 3], function(num) { + * return num < 3; + * }); + * // => [3] * - * @static - * @memberOf _ - * @category String - * @param {string} string The string to convert. - * @param {number} [radix=10] The radix to interpret `value` by. - * @param- {Object} [guard] Enables use as an iteratee for functions like `_.map`. - * @returns {number} Returns the converted integer. - * @example + * var characters = [ + * { 'name': 'barney', 'blocked': true, 'employer': 'slate' }, + * { 'name': 'fred', 'blocked': false, 'employer': 'slate' }, + * { 'name': 'pebbles', 'blocked': true, 'employer': 'na' } + * ]; * - * _.parseInt('08'); - * // => 8 + * // using "_.pluck" callback shorthand + * _.pluck(_.rest(characters, 'blocked'), 'name'); + * // => ['fred', 'pebbles'] * - * _.map(['6', '08', '10'], _.parseInt); - * // => [6, 8, 10] + * // using "_.where" callback shorthand + * _.rest(characters, { 'employer': 'slate' }); + * // => [{ 'name': 'pebbles', 'blocked': true, 'employer': 'na' }] */ - function parseInt(string, radix, guard) { - // Chrome fails to trim leading whitespace characters. - // See https://code.google.com/p/v8/issues/detail?id=3109 for more details. - if (guard || radix == null) { - radix = 0; - } else if (radix) { - radix = +radix; + function rest(array, callback, thisArg) { + if (typeof callback != 'number' && callback != null) { + var n = 0, + index = -1, + length = array ? array.length : 0; + + callback = lodash.createCallback(callback, thisArg, 3); + while (++index < length && callback(array[index], index, array)) { + n++; + } + } else { + n = (callback == null || thisArg) ? 1 : nativeMax(0, callback); } - string = toString(string).replace(reTrim, ''); - return nativeParseInt(string, radix || (reHasHexPrefix.test(string) ? 16 : 10)); + return slice(array, n); } /** - * Repeats the given string `n` times. + * Uses a binary search to determine the smallest index at which a value + * should be inserted into a given sorted array in order to maintain the sort + * order of the array. If a callback is provided it will be executed for + * `value` and each element of `array` to compute their sort ranking. The + * callback is bound to `thisArg` and invoked with one argument; (value). + * + * If a property name is provided for `callback` the created "_.pluck" style + * callback will return the property value of the given element. + * + * If an object is provided for `callback` the created "_.where" style callback + * will return `true` for elements that have the properties of the given object, + * else `false`. * * @static * @memberOf _ - * @category String - * @param {string} [string=''] The string to repeat. - * @param {number} [n=0] The number of times to repeat the string. - * @returns {string} Returns the repeated string. + * @category Arrays + * @param {Array} array The array to inspect. + * @param {*} value The value to evaluate. + * @param {Function|Object|string} [callback=identity] The function called + * per iteration. If a property name or object is provided it will be used + * to create a "_.pluck" or "_.where" style callback, respectively. + * @param {*} [thisArg] The `this` binding of `callback`. + * @returns {number} Returns the index at which `value` should be inserted + * into `array`. * @example * - * _.repeat('*', 3); - * // => '***' + * _.sortedIndex([20, 30, 50], 40); + * // => 2 + * + * // using "_.pluck" callback shorthand + * _.sortedIndex([{ 'x': 20 }, { 'x': 30 }, { 'x': 50 }], { 'x': 40 }, 'x'); + * // => 2 + * + * var dict = { + * 'wordToNumber': { 'twenty': 20, 'thirty': 30, 'fourty': 40, 'fifty': 50 } + * }; * - * _.repeat('abc', 2); - * // => 'abcabc' + * _.sortedIndex(['twenty', 'thirty', 'fifty'], 'fourty', function(word) { + * return dict.wordToNumber[word]; + * }); + * // => 2 * - * _.repeat('abc', 0); - * // => '' + * _.sortedIndex(['twenty', 'thirty', 'fifty'], 'fourty', function(word) { + * return this.wordToNumber[word]; + * }, dict); + * // => 2 */ - function repeat(string, n) { - string = toString(string); - n = toInteger(n); + function sortedIndex(array, value, callback, thisArg) { + var low = 0, + high = array ? array.length : low; - var result = ''; - if (!string || n < 1 || n > MAX_SAFE_INTEGER) { - return result; - } - // Leverage the exponentiation by squaring algorithm for a faster repeat. - // See https://en.wikipedia.org/wiki/Exponentiation_by_squaring for more details. - do { - if (n % 2) { - result += string; - } - n = nativeFloor(n / 2); - string += string; - } while (n); + // explicitly reference `identity` for better inlining in Firefox + callback = callback ? lodash.createCallback(callback, thisArg, 1) : identity; + value = callback(value); - return result; + while (low < high) { + var mid = (low + high) >>> 1; + (callback(array[mid]) < value) + ? low = mid + 1 + : high = mid; + } + return low; } /** - * Replaces matches for `pattern` in `string` with `replacement`. - * - * **Note:** This method is based on [`String#replace`](https://mdn.io/String/replace). + * Creates an array of unique values, in order, of the provided arrays using + * strict equality for comparisons, i.e. `===`. * * @static * @memberOf _ - * @category String - * @param {string} [string=''] The string to modify. - * @param {RegExp|string} pattern The pattern to replace. - * @param {Function|string} replacement The match replacement. - * @returns {string} Returns the modified string. + * @category Arrays + * @param {...Array} [array] The arrays to inspect. + * @returns {Array} Returns an array of combined values. * @example * - * _.replace('Hi Fred', 'Fred', 'Barney'); - * // => 'Hi Barney' + * _.union([1, 2, 3], [5, 2, 1, 4], [2, 1]); + * // => [1, 2, 3, 5, 4] */ - function replace() { - var args = arguments, - string = toString(args[0]); - - return args.length < 3 ? string : string.replace(args[1], args[2]); + function union() { + return baseUniq(baseFlatten(arguments, true, true)); } /** - * Converts `string` to [snake case](https://en.wikipedia.org/wiki/Snake_case). + * Creates a duplicate-value-free version of an array using strict equality + * for comparisons, i.e. `===`. If the array is sorted, providing + * `true` for `isSorted` will use a faster algorithm. If a callback is provided + * each element of `array` is passed through the callback before uniqueness + * is computed. The callback is bound to `thisArg` and invoked with three + * arguments; (value, index, array). + * + * If a property name is provided for `callback` the created "_.pluck" style + * callback will return the property value of the given element. + * + * If an object is provided for `callback` the created "_.where" style callback + * will return `true` for elements that have the properties of the given object, + * else `false`. * * @static * @memberOf _ - * @category String - * @param {string} [string=''] The string to convert. - * @returns {string} Returns the snake cased string. + * @alias unique + * @category Arrays + * @param {Array} array The array to process. + * @param {boolean} [isSorted=false] A flag to indicate that `array` is sorted. + * @param {Function|Object|string} [callback=identity] The function called + * per iteration. If a property name or object is provided it will be used + * to create a "_.pluck" or "_.where" style callback, respectively. + * @param {*} [thisArg] The `this` binding of `callback`. + * @returns {Array} Returns a duplicate-value-free array. * @example * - * _.snakeCase('Foo Bar'); - * // => 'foo_bar' - * - * _.snakeCase('fooBar'); - * // => 'foo_bar' + * _.uniq([1, 2, 1, 3, 1]); + * // => [1, 2, 3] * - * _.snakeCase('--foo-bar'); - * // => 'foo_bar' - */ - var snakeCase = createCompounder(function(result, word, index) { - return result + (index ? '_' : '') + word.toLowerCase(); - }); - - /** - * Splits `string` by `separator`. + * _.uniq([1, 1, 2, 2, 3], true); + * // => [1, 2, 3] * - * **Note:** This method is based on [`String#split`](https://mdn.io/String/split). + * _.uniq(['A', 'b', 'C', 'a', 'B', 'c'], function(letter) { return letter.toLowerCase(); }); + * // => ['A', 'b', 'C'] * - * @static - * @memberOf _ - * @category String - * @param {string} [string=''] The string to split. - * @param {RegExp|string} separator The separator pattern to split by. - * @param {number} [limit] The length to truncate results to. - * @returns {Array} Returns the new array of string segments. - * @example + * _.uniq([1, 2.5, 3, 1.5, 2, 3.5], function(num) { return this.floor(num); }, Math); + * // => [1, 2.5, 3] * - * _.split('a-b-c', '-', 2); - * // => ['a', 'b'] + * // using "_.pluck" callback shorthand + * _.uniq([{ 'x': 1 }, { 'x': 2 }, { 'x': 1 }], 'x'); + * // => [{ 'x': 1 }, { 'x': 2 }] */ - function split(string, separator, limit) { - return toString(string).split(separator, limit); + function uniq(array, isSorted, callback, thisArg) { + // juggle arguments + if (typeof isSorted != 'boolean' && isSorted != null) { + thisArg = callback; + callback = (typeof isSorted != 'function' && thisArg && thisArg[isSorted] === array) ? null : isSorted; + isSorted = false; + } + if (callback != null) { + callback = lodash.createCallback(callback, thisArg, 3); + } + return baseUniq(array, isSorted, callback); } /** - * Converts `string` to [start case](https://en.wikipedia.org/wiki/Letter_case#Stylistic_or_specialised_usage). + * Creates an array excluding all provided values using strict equality for + * comparisons, i.e. `===`. * * @static * @memberOf _ - * @category String - * @param {string} [string=''] The string to convert. - * @returns {string} Returns the start cased string. + * @category Arrays + * @param {Array} array The array to filter. + * @param {...*} [value] The values to exclude. + * @returns {Array} Returns a new array of filtered values. * @example * - * _.startCase('--foo-bar'); - * // => 'Foo Bar' - * - * _.startCase('fooBar'); - * // => 'Foo Bar' - * - * _.startCase('__foo_bar__'); - * // => 'Foo Bar' + * _.without([1, 2, 1, 0, 3, 1, 4], 0, 1); + * // => [2, 3, 4] */ - var startCase = createCompounder(function(result, word, index) { - return result + (index ? ' ' : '') + capitalize(word); - }); + function without(array) { + return baseDifference(array, slice(arguments, 1)); + } /** - * Checks if `string` starts with the given target string. + * Creates an array that is the symmetric difference of the provided arrays. + * See http://en.wikipedia.org/wiki/Symmetric_difference. * * @static * @memberOf _ - * @category String - * @param {string} [string=''] The string to search. - * @param {string} [target] The string to search for. - * @param {number} [position=0] The position to search from. - * @returns {boolean} Returns `true` if `string` starts with `target`, else `false`. + * @category Arrays + * @param {...Array} [array] The arrays to inspect. + * @returns {Array} Returns an array of values. * @example * - * _.startsWith('abc', 'a'); - * // => true - * - * _.startsWith('abc', 'b'); - * // => false + * _.xor([1, 2, 3], [5, 2, 1, 4]); + * // => [3, 5, 4] * - * _.startsWith('abc', 'b', 1); - * // => true + * _.xor([1, 2, 5], [2, 3, 5], [3, 4, 5]); + * // => [1, 4, 5] */ - function startsWith(string, target, position) { - string = toString(string); - position = baseClamp(toInteger(position), 0, string.length); - return string.lastIndexOf(target, position) == position; + function xor() { + var index = -1, + length = arguments.length; + + while (++index < length) { + var array = arguments[index]; + if (isArray(array) || isArguments(array)) { + var result = result + ? baseUniq(baseDifference(result, array).concat(baseDifference(array, result))) + : array; + } + } + return result || []; } /** - * Creates a compiled template function that can interpolate data properties - * in "interpolate" delimiters, HTML-escape interpolated data properties in - * "escape" delimiters, and execute JavaScript in "evaluate" delimiters. Data - * properties may be accessed as free variables in the template. If a setting - * object is given it takes precedence over `_.templateSettings` values. - * - * **Note:** In the development build `_.template` utilizes - * [sourceURLs](http://www.html5rocks.com/en/tutorials/developertools/sourcemaps/#toc-sourceurl) - * for easier debugging. - * - * For more information on precompiling templates see - * [lodash's custom builds documentation](https://lodash.com/custom-builds). - * - * For more information on Chrome extension sandboxes see - * [Chrome's extensions documentation](https://developer.chrome.com/extensions/sandboxingEval). + * Creates an array of grouped elements, the first of which contains the first + * elements of the given arrays, the second of which contains the second + * elements of the given arrays, and so on. * * @static * @memberOf _ - * @category String - * @param {string} [string=''] The template string. - * @param {Object} [options] The options object. - * @param {RegExp} [options.escape] The HTML "escape" delimiter. - * @param {RegExp} [options.evaluate] The "evaluate" delimiter. - * @param {Object} [options.imports] An object to import into the template as free variables. - * @param {RegExp} [options.interpolate] The "interpolate" delimiter. - * @param {string} [options.sourceURL] The sourceURL of the template's compiled source. - * @param {string} [options.variable] The data object variable name. - * @param- {Object} [guard] Enables use as an iteratee for functions like `_.map`. - * @returns {Function} Returns the compiled template function. + * @alias unzip + * @category Arrays + * @param {...Array} [array] Arrays to process. + * @returns {Array} Returns a new array of grouped elements. * @example * - * // Use the "interpolate" delimiter to create a compiled template. - * var compiled = _.template('hello <%= user %>!'); - * compiled({ 'user': 'fred' }); - * // => 'hello fred!' - * - * // Use the HTML "escape" delimiter to escape data property values. - * var compiled = _.template('<%- value %>'); - * compiled({ 'value': '