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I have started learning Jquery and I am struck with something. I searched to learn about it but I am rather confused

 (function($){
    //all code here
    })(window.jquery)

Some documents say that this code executes immediately.
Some say that it isolates the variables from the external world.
and some say that it is used to prevent '$'so that it could be used as a jquery object.

So what exactly does it do ?? Is there anything else that is done by this small arrogant code?

Let me see
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    `immediately invoked function expression` this suits. – Praveen Nov 13 '13 at 07:03
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    this might help you http://stackoverflow.com/questions/10896749/what-does-function-function-window-jquery-do – rajesh kakawat Nov 13 '13 at 07:04
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    see http://stackoverflow.com/questions/10896749/what-does-function-function-window-jquery-do see the real use that twitter uses using this – Dev Nov 13 '13 at 07:06

2 Answers2

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(function () {
})()

Is a self-invoking anonymous function.

function ($) {

}(window.jQuery)

Passing, window.jQuery into that function as argument and accepting as $.

What this does is making $ an alias to window.jQuery (original jQuery Object) and hence ensuring that the $ will always refer to the jQuery object inside that closure, no matter if other library has taken that($) outside.

Check this link : Link

Community
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Ankit Tyagi
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check below link for explanation

http://tech.myemma.com/iifes-javascript-control-variable-scope/

http://helephant.com/2008/08/23/javascript-anonymous-functions/

rajesh kakawat
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