StackOverflow2013

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14374858
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2013-01-17T08:27:05.403
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2013-01-17T08:27:05.403
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text
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<blockquote> What happens to abc? </blockquote> It contains a function object. If you are doing nothing with it, it will be garbage-collected. <blockquote> Why it works? </blockquote> Why not? What "works"? <blockquote> abc can be called but not def, why? </blockquote> This is only true from outside, and not in IE. See below. <blockquote> Is it a function declaration or an expression? </blockquote> It is a function expression. You can easily see that as it is part of an assignment expression; declarations always need to be on top level (of functions or global code) <blockquote> def is undefined - why? </blockquote> Only from outside. A function expression does not create variables. "def" is the <a href="https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/Function/name" rel="noreferrer">name</a> of the function, and inside the function it is a reference to the function as well. This allows recursion for example without using any outer variables. <pre><code>var abc = function def() { def === abc; // true def.name; // "def" } abc(); def; // undefined </code></pre> <blockquote> If it is supposed to be, are there memory leaks? </blockquote> Yes, in Internet Explorer. It creates two distinct functions from that code. For the details, see <a href="http://kangax.github.com/nfe/#jscript-bugs" rel="noreferrer">http://kangax.github.com/nfe/#jscript-bugs</a> <blockquote> Why is abc.prototype is function def? </blockquote> It is not. It is just an object. Maybe it is shown with that name in your console, as belongs to a function named "def".
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1. POKnow JavaScript Function Expression vs Function Declaration, but what is this? Named Function Expression?
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1. POKnow JavaScript Function Expression vs Function Declaration, but what is this? Named Function Expression?
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1. CO+1 for covering the "practical" implementation issues (I knew there were some issues, but not *that* many :-/)
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