what does this symbol '()' do after closing '{}'in javascript

Question

I'm really sorry with the title, and im sorry if im asking this noob questions here, because i don't know what the keyword for this in google.

Ok, first i'm new to javascript and still learning this programming language. so i've seen this alot, but i don't know what it's mean

var myapp = function(){

  var a = 'a';
  var b = function(){
    //some code goes here
  }

  return {

    init: function(){
    b();
    //some code goes here

    }

  }

}() <-- what is it?;

So i've been wondering what this symbol '()' do at the end. and why many people writing a function inside a variable?

It tells the Javascript interpreter to execute the function immediately after it is defined. — mortsahl, Jul 12 '14 at 20:41
The function is executed just after it's declaration. It's called a module pattern if you want to search about it. — Sebastien C., Jul 12 '14 at 20:42
Ok thank you very much for the link, sorry if i;m duplicating question — Ahmad Milzam, Jul 12 '14 at 20:44

score 3 · Accepted Answer · answered Jul 12 '14 at 20:41

3

That means that the function is being exectued right after its declaration

On the other hand, declaring the function this way:

var myapp = function(){

lets you use it as an object..

Then you can use myapp.init() for example

answered Jul 12 '14 at 20:41

Pablo Matias Gomez

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is this a good practice? thank you for the answer – Ahmad Milzam Jul 12 '14 at 20:45

what does this symbol '()' do after closing '{}'in javascript

1 Answers1