calling object members - javascript

Question

If i have:

var obj={
    a:function(){obj.b();},
    b:function(){this.a();}
};

is there any difference in calling object methods with "this" or referring directly to the object itself because it is on the same scope as the method?

Joseph · Accepted Answer · 2012-08-06 12:13:08Z

3

Depends

this can take many forms, making it unpredictable:

In a normal function call, like funcName(), this is the global object. In browsers, it's the window object.
In a normal function call where the function uses "use strict", this is undefined.
For a function used as a constructor, like var instance = new ConstructorFunction(), this will refer to the instance object created from that constructor.
For object literals, this is the immediate object literal enclosing the function.
When called by call(context,args...) or apply(context,[args...]), this is whatever context is.

edited Aug 6, 2012 at 12:13

answered May 7, 2012 at 15:35

Joseph

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SLaks · Accepted Answer · 2012-05-07 15:36:04Z

2

this can change depending on how you call the function:

var funnyB = obj.b;
funnyB();  //this is window

answered May 7, 2012 at 15:36

SLaks

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Comments

Greg Franko · Accepted Answer · 2012-05-07 19:27:37Z

0

In the object literal context that you provided, there is no logical difference. The this keyword points to the obj variable, since this is a reference to the object that the function is a property/method of.

edited May 7, 2012 at 19:27

answered May 7, 2012 at 17:24

Greg Franko

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