What is the purpose of this? (function ($) { //function code here })(jQuery);

by 
var $ = "some value we don't care about";

 // v=====normal plain old function
(function ($) {
 //        ^=======receives jQuery object as the $ parameter

    //majority of code here, where $ === jQuery...

    $('.myclass').do().crazy().things();


})(jQuery);
 //  ^=======immediately invoked, and passed the jQuery object


 // out here, $ is undisturbed
alert( $ ); // "some value we don't care about"

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