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

By Trevor Burnham

With Async javascript, youll boost a deeper figuring out of the javascript language. Youll commence with a ground-up primer at the javascript occasion version - key to keeping off a few of the commonest errors javascripters make. From there youll see instruments and layout styles for turning that conceptual realizing into sensible 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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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. Making a Pure Promise We just learned that a Deferred is a Promise. So, how do we get a Promise that isn’t a Deferred?

7. js Up to this point, this book has been about using abstractions to manage async tasks throughout an application. , from the view to the model). Promises are an abstraction that let us represent simple tasks with objects that can be combined to represent complex tasks. Together, these abstractions go a long way toward helping us solve the problem of callback spaghetti. There’s still one weak spot in our armor, though: iteration. What do we do when we need to perform a series of I/O operations, either in series or in parallel?

But the biggest advantage of using Promises is that you can easily derive new Promises from existing ones. You might ask two Promises representing parallel tasks to give you a Promise that will inform you of their mutual completion. Or you might ask a Promise representing the first task in a series to give you a Promise representing the final task in the series. As we’ll soon see, these operations come naturally with Promises. 1 A Very Brief History of Promises Promises have existed in many forms in many languages.

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