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Download e-book for iPad: Async JavaScript: Build More Responsive Apps with Less Code by Trevor Burnham

By Trevor Burnham

ISBN-10: 1937785270

ISBN-13: 9781937785277

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 fending off the various most typical blunders javascripters make. From there youll see instruments and layout styles for turning that conceptual knowing into functional code.
The options within the e-book 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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A choice was made: No game today. So, when the Deferred was rejected, its always and fail callbacks were run. Note that callbacks always run in the order in which they were bound. 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.

A pure Promise only lets you add more callbacks; someone else has to trigger them. 2. 3. info report erratum • discuss Chapter 3. Promises and Deferreds • 34 We can trigger our Deferred with the resolve and reject methods. net/TrevorBurnham/PJ6Bf/. Load the page and hit Y. The console will say the following: ❮ A choice was made: Starting game... You see what happened? When the Deferred was resolved, its always and done callbacks were run. ) Refresh the page and hit N. ❮ A choice was made: No game today.

The architects of Node’s API liked PubSub so much that they decided to include a generic PubSub entity called EventEmitter that other objects can inherit from. Just about every source of I/O in Node is an EventEmitter: file streams, HTTP servers, and even the application process itself. log('Goodnight, ' + name); }); }); 1. info report erratum • discuss PubSub • 21 Countless stand-alone PubSub libraries exist for the browser. js and Spine provide their own EventEmitter-like modules. We’ll talk more about Backbone later in this chapter.

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

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