Parenthesis around functions in JavaScript

Question

Possible Duplicate:
Explain JavaScript's encapsulated anonymous function syntax

I've seen this code:

( fab.nodejs )
     ( function() { this({body: "my app" })(); })

I wonder what the outer parenthesis do?

Answer 1

The parenthesis will ensure that the function is treated as a function expression instead of a function declaration (aka function statement). You may want to check out the following article for further reading about the difference between a function expression and a function declaration:

• Mozilla Dev Center: Function constructor vs. function declaration vs. function expression

Answer 2

similar question

• http://stackoverflow.com/questions/440739/what-do-parentheses-surrounding-a-javascript-object-function-class-declaration-me

• http://stackoverflow.com/questions/423228/difference-between-function-and-function

It is a self-executing anonymous function. The first set of brackets contain the epxressions to be executed, and the second set of brackets executes those expressions.