From 6b2f04c8d3ea395e02a92687b68bb05a4f33c9f8 Mon Sep 17 00:00:00 2001
From: Jack Allnutt <m2ys4u@gmail.com>
Date: Wed, 22 May 2013 10:08:14 +0100
Subject: [PATCH] Optimise chanlist render()

Don't loop over all channels as head of channel list is in the same order as the DOM.

Use a for loop to append the channel rows instead of _.each to avoid overhead of function call.
---
 client/assets/dev/applet_chanlist.js | 29 ++++++++++++----------------
 1 file changed, 12 insertions(+), 17 deletions(-)

diff --git a/client/assets/dev/applet_chanlist.js b/client/assets/dev/applet_chanlist.js
index 698d857..97db49d 100644
--- a/client/assets/dev/applet_chanlist.js
+++ b/client/assets/dev/applet_chanlist.js
@@ -26,20 +26,15 @@
         render: function () {
             var table = $('table', this.$el),
                 tbody = table.children('tbody:first').detach(),
-                that = this;
-            if (!this.isIE) {
-                tbody.children().each(function (idx, child) {
-                    var i, chan,
-                        channels_length = that.channels.length;
-                    chan = $(child.querySelector('.chan')).data('channel');
-                    for (i = 0; i < channels_length; i++) {
-                        if (that.channels[i].channel === chan) {
-                            that.channels[i].dom = tbody[0].removeChild(child);
-                            break;
-                        }
-                    }
-                });
-            }
+                that = this,
+                channels_length = this.channels.length,
+                i;
+
+            tbody.children().each(function (idx, child) {
+                if (that.channels[idx].channel === $(child.querySelector('.chan')).data('channel')) {
+                    that.channels[idx].dom = tbody[0].removeChild(child);
+                }
+            });
 
             if (this.ordered) {
                 this.channels.sort(function (a, b) {
@@ -47,9 +42,9 @@
                 });
             }
 
-            _.each(this.channels, function (chan) {
-                tbody[0].appendChild(chan.dom);
-            });
+            for (i = 0; i < channels_length; i++) {
+                tbody[0].appendChild(this.channels[i].dom);
+            }
             table[0].appendChild(tbody[0]);
         }
     });
-- 
2.25.1