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

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By Trevor Burnham

With Async javascript, youll enhance a deeper realizing of the javascript language. Youll commence with a ground-up primer at the javascript occasion version - key to keeping off a number of the most typical error javascripters make. From there youll see instruments and layout styles for turning that conceptual realizing into useful code.
The techniques within the ebook 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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If the always callback had been bound last, the order of the console output would be reversed. Try hitting Y and N repeatedly. After the first choice is made, there’s no effect! That’s because a Promise can be resolved or rejected only once; after that, it’s inert. We say that a Promise is pending until it’s either resolved or rejected. You can find out whether a Promise is "pending", "resolved", or "rejected" by calling its state method. , success/failure or accept/decline), making a Deferred gives you an intuitive representation of it.

Done(function() { // the GET information is now in serverData... when, and other jQuery methods that take Promises, allow you to pass in non-Promises. These are treated like Promises that have resolved with the given value in the corresponding argument slot. when('test', promise) will give you a Promise that immediately resolves with the values 'test' and [1, 2, 3]. when know whether an argument is a Promise? info report erratum • discuss Binding to the Future with pipe • 41 named promise; if one exists, jQuery uses the value returned by that method.

Info report erratum • discuss Chapter 3. always(onAlways); You might wonder what’s so great about this change. Why would you want to attach a callback after an Ajax call has fired? In a word: encapsulation. If an Ajax call has multiple effects (triggering animations, inserting HTML, locking/unlocking user input, and so on), it’s awkward for the part of your app that’s making the request to handle all of them. It’s much more elegant to pass a Promise around. By passing a Promise, you’re announcing, “Something you might be interested in is happening.

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