By Trevor Burnham
The thoughts 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.
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Fear not—a Deferred is a Promise! More precisely, it’s a superset of Promise with one critical addition: you can trigger a Deferred directly. 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?
Done(startGame); when acts as a logical AND for Promise resolution. The Promise it generates is resolved as soon as all of the given Promises are resolved, or it is rejected as soon as any one of the given Promises is rejected. An excellent use case for when is combining multiple Ajax calls. If you need to make two POST calls at once and get a notification when both have succeeded, there’s no need to define a separate callback for each request. then(onPosted, onFailure); On success, when can get access to the callback arguments from each of its constituent Promises, but doing so is tricky.
You know, just in case. 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.