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<Callbacks vs Events ⁄ >

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Most of the major JavaScript libraries claim to support custom events in one form or another. For example, jQuery, YUI and Dojo all support a custom "document ready" event. However, the implementation of these custom events is always some form of callback system.

A callback system works by storing event handlers in an array. When the actual event is detected the dispatch system loops through the array calling the callback functions in turn. So what's wrong with that? Before I answer that, let's look at some code.

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