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    <p>Even though this is an old question and answer, it discusses a topic that to this day throws many developers for a loop. I can't count the number of JavaScript developer candidates I've interviewed who couldn't tell me the difference between a function declaration and a function expression <em>and</em> who had no clue what an immediately invoked function expression is.</p> <p>I'd like to mention, though, one very important thing which is that Premasagar's code snippet wouldn't work even if he had given it a name identifier.</p> <pre><code>function someName() { alert(2 + 2); }(); </code></pre> <p>The reason this wouldn't work is that the JavaScript engine interprets this as a function declaration followed by a completely unrelated grouping operator that contains no expression, and grouping operators <em>must</em> contain an expression. According to JavaScript, the above snippet of code is equivalent to the following one.</p> <pre><code>function someName() { alert(2 + 2); } (); </code></pre> <p>Another thing I'd like to point out that may be of some use to some people is that any name identifier you provide for a function expression is pretty much useless in the context of the code except from within the function definition itself.</p> <pre><code>var a = function b() { // do something }; a(); // works b(); // doesn't work var c = function d() { window.setTimeout(d, 1000); // works }; </code></pre> <p>Of course, using name identifiers with your function definitions is always helpful when it comes to debugging code, but that's something else entirely... :-)</p>
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