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Possible Duplicates: What is the difference between a function expression vs declaration in JavaScript? Explain JavaScript's encapsulated anonymous function syntax Why this: (function () { //code }()); and this: var f = function () { //code }(); works, while this: function () { //code }(); does not? It looks exactly the same - anonymous function defined, and immediately called. Can someone make a quotation from the JavaScript/ECMAScript standard which explains that? UPDATE : Thanks for the answers everyone! So it's about function expression vs. function declaration . See this Stack Overflow answer , ECMAScript standard section 13, and this great article: Named function expressions demystified . To recap answers: The first snippet is interpreted as an expression because the grouping operator, () , is applied - see ECMAScript standard section 11.1.6. In the second snippet, the function is interpreted as an expression because it's on the right-hand part of assignment operator, = . The third snippet doesn't have anything which allows the interpreter to read the function as an express

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