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    <p>A cleaner alternative to what @Ivo has suggested would be an <strong>Asynchronous Method Queue</strong>, assuming that you only need to make one async call for the collection.</p> <p>(See <a href="http://www.dustindiaz.com/async-method-queues/" rel="noreferrer">this post</a> by Dustin Diaz for a more detailed explanation)</p> <pre><code>function Queue() { this._methods = []; this._response = null; this._flushed = false; } (function(Q){ Q.add = function (fn) { if (this._flushed) fn(this._response); else this._methods.push(fn); } Q.flush = function (response) { if (this._flushed) return; this._response = response; while (this._methods[0]) { this._methods.shift()(response); } this._flushed = true; } })(Queue.prototype); </code></pre> <p>You simply create a new instance of <code>Queue</code>, add the callbacks you need, and then flush the queue with the async response.</p> <pre><code>var queue = new Queue(); queue.add(function(results){ for (var result in results) { // normal loop operation here } }); someFunction(param1, param2, function(results) { queue.flush(results); } </code></pre> <p>An added benefit of this pattern is that you can add multiple functions to the queue instead of just one.</p> <p>If you have an object which contains iterator functions, you can add support for this queue behind the scenes and write code which looks synchronous, but isn't:</p> <pre><code>MyClass.each(function(result){ ... }) </code></pre> <p>simply write <code>each</code> to put the anonymous function into the queue instead of executing it immediately, and then flush the queue when your async call is complete. This is a very simple and powerful design pattern.</p> <p>P.S. If you're using jQuery, you already have an async method queue at your disposal called <a href="http://joseoncode.com/2011/09/26/a-walkthrough-jquery-deferred-and-promise/" rel="noreferrer">jQuery.Deferred</a>.</p>
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    1. POAsynchronous for cycle in JavaScript
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    1. COWell if understood the question correctly this will not yield the desired behavior, it seems that she wants to do some callbacks in `someFunction` which delay the rest of the loop, your pattern sets up a list of functions which will get executed in order and will all receive the results of *one* other function call. It's a good pattern but I don't think it matches the question in question.
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      1. USIvo Wetzel
    2. CO@Ivo Without more information we won't know for sure, but speaking in generalities I think it is bad design to make synchronous code wait for an async operation before continuing; in every case I have tried it, it resulted in a noticeable UI lag due to JS being single-threaded. If the operation takes too long, you run the risk of your script being forcibly stopped by the browser.
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    3. CO@Ivo also I am very wary of code that relies on `setTimeout`. You risk unintended behavior if the code is executed faster than you anticipate.
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