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?

Answer 1

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.