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    <p>If your major concern is not to freeze UI during lengthy javascript processing you developed, you can refactor loop bodies into sequential steps, such that each step call its next by using <code>window.setTimeout</code>. This technique allows the (single) thread to process UI events between each interaction:</p> <pre><code>var pr = function(x) {console.log(x)}; var COUNT=3; // original regular javascript loop for(var i=0; i&lt;COUNT; i++) { var msg = "current index is (" + i + ")"; pr(msg); } // step-by-step sequential calls var body = function(i) { var msg = "non-blocking for: index is (" + i + ")"; pr(msg); } nonBlockingFor(body, 4); </code></pre> <p>The function <code>nonBlockingFor</code> calls the first argument (as a function) the number of times passed as second argument. It's definition follows:</p> <pre><code>// function constructor var nonBlockingFor = (function() { function _run(context) { if(context.idx &gt; context.max) return; context.fnc(context.idx++); window.setTimeout((function(){ _run(context)}), 1); } return (function _start(ufn, uqt, runId) { _run({idx: 0, max: uqt -1, fnc: ufn || (function(){}), runId: runId}); }); })(); </code></pre> <p>Please note that this is a very simplified function and it can be improved to handle other multi-thread related issues -- i.e: waiting for the threads to finish (join). I hope this code helps you. Please let me know if you like this approach to the problem, I could spend some time improving my suggestion, if you like.</p>
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    1. POHow to deal with heavy-load processing of displayed data in the browser
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    1. USGerardo Lima
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    1. COThanks a lot for this answer. In fact, that is really near from what I called a 'coroutine-like' approach... The problem with this kind of solution is the exploding overall implementation complexity when algorithm tends to be complex. :-(
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      1. USMike Aski
    2. COThe good part is that, after you setup the library to run non-blocking / concurrent javascript, you can develop the business library in a strait forward, homogeneous way. By the way, maybe you already know it, but this library seems a good candidate [ https://github.com/caolan/async/ ].
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    3. COThanks for the link. I did not knew this lib. Sounds interesting.
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