Async JavaScript: Build More Responsive Apps with Less Code by Trevor Burnham

By Trevor Burnham

With Async javascript, youll enhance a deeper knowing of the javascript language. Youll begin with a ground-up primer at the javascript occasion version - key to heading off some of the commonest error javascripters make. From there youll see instruments and layout styles for turning that conceptual realizing into sensible code.
The recommendations within the publication 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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And if the cycle is synchronous, the result will be a stack overflow, like we saw in Synchronicity, on page 22. Yet oftentimes, a cycle of change events is exactly what we want. The most common case is a two-way binding, where two models have interrelated values. Suppose we want to ensure that x always equals 2 * y. info report erratum • discuss Chapter 2. set({value: 2 * yVal}); }); You might expect this code to lead to an infinite loop the moment the value of x or y is changed. But actually, it’s quite safe, thanks to two safeguards in Backbone.

The second safeguard presents gotchas of its own. Suppose a change is made to a model that results in a second change to the same model. Because the second change is “nested” in the first one, it’ll occur silently. Observers won’t have a chance to respond to it. Clearly, maintaining two-way data bindings in Backbone is a challenge. js, takes a different approach: two-way bindings are declared explicitly. When one value changes, the other is updated asynchronously from a timeout event. So, until that event fires, the application’s data may be in an inconsistent state.

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.

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