Question

143

rated 0 times [ 144] [ 1] / answers: 1 / hits: 28624 / 14 Years ago, thu, january 6, 2011, 12:00:00

I am trying to do something like this:

var obj = {

    a: 5,

    b: this.a + 1

}

(instead of 5 there is a function which I don't want to execute twice that returns a number)

I can rewrite it to assign obj.b later from obj.a, but can I do it right away during declaration?

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1 Year ago

answered 14 Years ago tylerdamiena · Accepted Answer

No. this in JavaScript does not work like you think it does. this in this case refers to the global object.

There are only 3 cases in which the value this gets set:

The Function Case

foo();

Here this will refer to the global object.

The Method Case

test.foo();

In this example this will refer to test.

The Constructor Case

new foo();

A function call that's preceded by the new keyword acts as a constructor. Inside the function this will refer to a newly
created Object.

Everywhere else, this refers to the global object.