what is the meaning of (function(a){...})(window);

irProject · #1 (**permalink**) November 6th, 2011, 03:08 PM

Hello,
somewhere i've seen this type of javascript codes:

Code:

(function(a){
// some code here ...
})(window);

or

(function(){
// some code here ...
})(jQuery);

or

(function(){
//some code here...
})();

what does these codes do?

irProject · #2 (**permalink**) November 9th, 2011, 01:19 PM

Hello,
I myself found the answer.
these are some ways to write less code. as you know the next line refers to a function:

Code:

function x(arg){ /*some codes here ...*/ }

what about this: ?

Code:

(function x(arg){ /*some codes here ...*/ })

we can call a function by passing parameters like:

Code:

x(3);

so ...

Code:

(function (a){ /* ... */ })(window);

means passing 'window' object as parameter 'a' to the defined function. in the body of this function , 'a' points to 'window'