What this mean in javascript? -

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possible duplicate:
explain javascript's encapsulated anonymous function syntax

i have read javascript book have seen code:

1(function() {            // code  })();

what ? special function ?

as written, has syntax error.

i'm guessing more like:

(function() {           // code })();

or 

(function() {           // code     } )();

break down:

(foo)() // calls foo no arguments.

and

function() { //creates function takes no arguments.       // code }

hence create function takes no arguments, , call it. can't see why apart showing can.


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