Javascript: Having a 'var' keyword before the 'this' keyword

Question

Philosophically, why can't I declare a new variable in JS by using this sort of code:

var this.blah = "hello"

I see that it hangs upon 'this' being a variable that has a meaning already, but -exactly- how?

what about corner cases and constructor functions?

Because its not a variable, but a property which you are assigning to? — Bergi, Sep 16 '13 at 16:42
it's invalid for var names to have a dot. you can do var blah = this.blah = 'hello' — dandavis, Sep 16 '13 at 16:42
possible duplicate of [Javascript: Do I need to put this.var for every variable in an object?](http://stackoverflow.com/questions/13418669/javascript-do-i-need-to-put-this-var-for-every-variable-in-an-object) — Bergi, Sep 16 '13 at 16:44

score 2 · Answer 1 · answered Sep 16 '13 at 16:42

2

When you assign properties of an object, you never need the var keyword. That is, you should never have something like var obj.prop = ....

answered Sep 16 '13 at 16:42

Trevor Dixon

1

what about the window object as an un-named global? ;P – dandavis Sep 16 '13 at 16:43

1 Answers1