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POFunction.prototype.bind
 

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    <p>I've got pretty interesting question about EcmaScript-5 Function.prototype.bind implementation. Usually when you use bind, you do it this way:</p> <pre><code>var myFunction = function() { alert(this); }.bind(123); // will alert 123 myFunction(); </code></pre> <p>Okay so that's cool, but what is suppose to happen when we do this?</p> <pre><code>// rebind binded function myFunction = myFunction.bind('foobar'); // will alert... 123! myFunction(); </code></pre> <p>I understand that it's completely logical behavior in terms of how Function.prototype.bind is implemented (<a href="https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Function/bind">https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Function/bind</a>). But in real life conditions it's completely useless behavior isn't it? The question is: is it bug or feature? If it's a bug, why it's nowhere mentioned? If it's a feature, why then Google Chrome with native "bind" implementation behaves absolutely the same way?</p> <p>To make it more clear, what in my opinion would make more sense, here is the code snippet that implements Function.prototype.bind a little bit differently:</p> <pre><code>if (!Function.prototype.bind) { Function.prototype.bind = function() { var funcObj = this; var original = funcObj; var extraArgs = Array.prototype.slice.call(arguments); var thisObj = extraArgs.shift(); var func = function() { var thatObj = thisObj; return original.apply(thatObj, extraArgs.concat( Array.prototype.slice.call( arguments, extraArgs.length ) )); }; func.bind = function() { var args = Array.prototype.slice.call(arguments); return Function.prototype.bind.apply(funcObj, args); } return func; }; } </code></pre> <p>So now try this:</p> <pre><code>// rebind binded function myFunction = myFunction.bind('foobar'); // will alert... "foobar" myFunction(); </code></pre> <p>In my opinion, replacing "this" makes more sense...</p> <p>So what do you guys think about it?</p>
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    1. COIt's a feature. If you could override it, it would not be really "bound", would it? The details can be found in the specification: http://ecma262-5.com/ELS5_HTML.htm#Section_15.3.4.5
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      1. USFelix Kling
    2. COSure but if it is, then what is the way to determine if the function has been already bound to something? or why it doesn't throw any exception when attempting to rebind it? The thing is that it makes it extremely hard to debug, if you don't know if the function has been bound or you deal with the first copy of it. Such thing happened to me yesterday, and I've spend almost a day to find out the roots of the problem...
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    3. COWell anyways, it seems that no one is gonna answer this question, so in case if someone else will have the same problem, I've created a workaroud that you can find here: http://www.angrycoding.com/2011/09/to-bind-or-not-to-bind-that-is-in.html
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