need some info on declaring the variable in the following style

Question

Possible Duplicate:
JavaScript scope and closure
JavaScript - self executing functions

What is the difference between the following code:


var someVar = (function(){
   // some code
})();

And


var someVar = function(){
   // some code
};

Can you point me to tutorials on the usage and explanation of first code?

It is hard to find the answer on Google, so I thought I would ask it here.

Thank you.

Test yourself : http://jsfiddle.net/sdsmV/. The second way defines the function and the first way fire the function and put the return value in `someVar`. — user1365010, Jun 18 '12 at 20:39

score 1 · Answer 1 · answered Jun 18 '12 at 20:44

First case

Will be created and executed anonymous function. Function result will be stored in someVar.

var someVar = (function(){
    console.log('function executed');
    return 1;
})();
// function executed
console.log(someVar);
// 1

Second case

Will be created anonymous function and it's reference will be stored in someVar.

var someVar = function(){
    console.log('function executed');
    return 1;
};

var result = someVar();
// function executed
console.log(result);
// 1

need some info on declaring the variable in the following style

1 Answers1