What Is This Javascript Syntax? !function(){}

Possible Duplicate: What does the exclamation mark do before the function? I came across this today and have never seen before: !function($) { //contents removed }( window.jQue

Solution 1:

An exclamation mark before a function statement creates a function expression. If you want to create a function which invokes itself, it must be an expression not a declaration.

One could achieve the same result by using a + character for instance, or putting the whole expression into parenthesis.

+function( $ ) {}( window.jQUery );

or

(function( $ ) {}( window.jQuery ));