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Are “(function ( ) { } ) ( )” and “(function ( ) { } ( ) )” functionally equal in JavaScript?
This is something I haven't quite figured out yet, but I have been using function(){}() just because my VIM syntax highlight screws up if I add the parenthesis, although I've seen (function(){})() around many times, maybe its an IE thing?
edit:
var singleton = function() { // code }(); var singleton = (function() { // code })(); 
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The duplicate-checking formula uses =COUNTIF to “count” which cells contain data that appears more than once throughout the spreadsheet. Resulting values can either be “TRUE” (indicating duplicate data) or “FALSE” (showing non-duplicate data).
The main difference between a function expression and a function declaration is the function name, which can be omitted in function expressions to create anonymous functions. A function expression can be used as an IIFE (Immediately Invoked Function Expression) which runs as soon as it is defined.
Foo (pronounced FOO) is a term used by programmers as a placeholder for a value that can change, depending on conditions or on information passed to the program. Foo and other words like it are formally known as metasyntactic variables.
Peter Michaux discusses the difference in An Important Pair of Parens.
Basically the parentheses are a convention to denote that an immediately invoked function expression is following, not a plain function. Especially if the function body is lengthy, this reduces surprises,
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