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What does the exclamation mark do before the function?

I saw this in bootstrap-dropdown.js 

!function ($) {
   "use strict"; // jshint ;_;
   ...
}(window.jQuery);

what is the reason behind this bang (negation) before immediate anonymous function invocation?

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jcubic
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  • So it executes, otherwise it's just a function declaration. -- See also http://stackoverflow.com/questions/3755606/what-does-the-exclamation-mark-do-before-the-function – Brad Christie Apr 30 '12 at 15:52

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