What's the difference between these three form of self-invoking anonymous function?

Question

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Are “(function ( ) { } ) ( )” and “(function ( ) { } ( ) )” functionally equal in JavaScript?

I'm reading the document below.

http://addyosmani.com/resources/essentialjsdesignpatterns/book/#patternity

When I looked though these examples, self-invoking of an anonymous function had three forms.

The one was

(function() {
    //do something
})();

and another was

function() {
    //do something
}();

and the other was

(function() {
    //do something
}());

What's the difference between these three forms?

Thank you for your reading!

The second one is a syntax error if it stands alone. – Felix Kling Jan 12 '13 at 15:14 — Felix Kling, Jan 12 '13 at 15:14

score 6 · Accepted Answer · answered Jan 12 '13 at 15:14

The first and last are effectively identical. The differences are a matter of style.

The second is unsafe as (depending on where it is) it could be a function declaration instead of a function expression, and you can't immediately invoke a function declaration.

score 1 · Answer 2 · answered Jan 12 '13 at 15:15

1

The proceeding function is not valid syntax:

function() {
    //do something
}();

answered Jan 12 '13 at 15:15

Kevin Bowersox

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What's the difference between these three form of self-invoking anonymous function?

2 Answers2