Async JavaScript by Trevor Burnham

By Trevor Burnham

Trevor Burnham, "Async JavaScript"
English | 2012 | 104 pages | PDF | three MB

With Async JavaScript, you’ll enhance a deeper figuring out of the JavaScript language. You’ll commence with a ground-up primer at the JavaScript occasion model—key to averting a few of the most typical blunders JavaScripters make. From there you’ll see instruments and layout styles for turning that conceptual knowing into useful code.

The suggestions 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. You’ll how you can create dynamic websites and hugely concurrent servers via studying the paintings of allotting occasions to the place they should be dealt with, instead of nesting callbacks inside of callbacks inside of callbacks.

Async JavaScript gets you up and working with actual net improvement fast. by the point you’ve complete the guarantees bankruptcy, you’ll be parallelizing Ajax requests or operating animations in series. through the top of the booklet, you’ll even know the way to leverage net staff and AMD for JavaScript functions with state-of-the-art functionality. most significantly, you’ll have the information you want to write async code with confidence.

What you need
Basic wisdom of JavaScript is usually recommended. in case you consider that you’re lower than pace, see the “Resources for studying JavaScript” part within the preface.

Table of Contents
Chapter 1. figuring out JavaScript Events
Chapter 2. dispensing Events
Chapter three. offers and Deferreds
Chapter four. stream regulate with Async.js
Chapter five. Multithreading with Workers
Chapter 6. Async Script Loading

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ReadFile(filename, 'utf8', function(err, contents) { if (err) throw err; concatenation += contents; }); because there’s no guarantee that the readFile callbacks would fire in the order that the readFile calls were made in. readFile just tells the OS to start reading a file. Most likely, shorter files will be read more quickly than longer files. As a result, the order in which the recipes are added to concatenation would be unpredictable. log line somehow run after all the callbacks have fired. To use multiple async tasks and get a predictable result, we’ll need to do some planning.

It turns out that jQuery checks each argument for a method report erratum • discuss Binding to the Future with pipe • 41 named promise; if one exists, jQuery uses the value returned by that method. A Promise’s promise method simply returns itself. when “coerces” jQuery objects into their animation Promises. when(fetching, $('#loading')); Just remember that we have to do this after starting the animation. If #loading’s animation queue is empty, its Promise resolves immediately. 6 Binding to the Future with pipe A big reason why performing a series of async tasks is often inconvenient in JavaScript is that you can’t attach handlers to the second task until the first one is complete.

Right now, nothing. It works, and it’s succinct. , on page 16), logging access attempts, throttling, and so on. Nested callbacks tempt us to add more features by adding more code, rather than implementing those features in manageable, reusable pieces. query(selectUser, username, queryCallback); function queryCallback(err, result) { if (err) throw err; passwordHash = result['password_hash']; hash(passwordGuess, hashCallback); } function hashCallback(passwordGuessHash) { callback(passwordHash === passwordGuessHash); } } report erratum • discuss Chapter 1.

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