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create empty tail as an invariant

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This commit is contained in:
Brad Dunbar
2011-10-31 10:36:30 -04:00
parent de2430554e
commit 6da0683605
1 changed files with 6 additions and 5 deletions
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11
backbone.js
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@@ -74,8 +74,10 @@
bind : function(ev, callback, context) {
var calls = this._callbacks || (this._callbacks = {});
var list = calls[ev] || (calls[ev] = {});
var tail = list.tail || list;
list.tail = tail.next = {callback: callback, context: context};
var tail = list.tail || (list.tail = list.next = {});
tail.callback = callback;
tail.context = context;
list.tail = tail.next = {};
return this;
},
@@ -83,17 +85,16 @@
// callbacks for the event. If `ev` is null, removes all bound callbacks
// for all events.
unbind : function(ev, callback) {
var calls, list, node, prev;
var calls, node, prev;
if (!ev) {
this._callbacks = {};
} else if (calls = this._callbacks) {
if (!callback) {
calls[ev] = {};
} else if (list = node = calls[ev]) {
} else if (node = calls[ev]) {
while (prev = node, node = node.next) {
if (node.callback !== callback) continue;
prev.next = node.next;
if (list.tail === node) list.tail = prev;
node.context = node.callback = null;
break;
}