By Trevor Burnham
The thoughts within the booklet are illustrated with runnable examples drawn from either the browser and the Node.js server framework, incorporating complementary libraries together with jQuery, Backbone.js, and Async.js.
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Many PubSub implementations parse the event string to provide special features. tbb"). js lets you bind handlers to the "all" event type, causing them to go off whenever anything happens. , "keypress mousemove". Synchronicity Although PubSub is an important technique for dealing with async events, there’s nothing inherently async about it. Consider this code: 3. log('bar'); The output is ❮ foo bar proving that the click handler was invoked immediately by trigger. In fact, whenever a jQuery event fires, all of its handlers will be executed sequentially without interruption.
You know, just in case. Me: Good point. Anything else? Mr. Ajax: Hey, I noticed that there’s some code duplication between those two callbacks! You could move that into a third always callback. Me: (impatiently) Alright, I’ll refactor them. Tell you what: why don’t you run now, and I’ll give you the callbacks later? Mr. Ajax: (irately) What do I look like, an EventEmitter? 5 changed Mr. Ajax’s need-it-now attitude. post) now return Promises. A Promise is an object that represents a task with two possible outcomes (success or failure) and holds callbacks that fire when one outcome or the other has occurred.