javascript object properties using properties of self

Question

Is it possible to assign a value to an object property using a property of the current object being decalred?

var myObject = new Object({ 
    a: 1, 
    b: 2, 
    c: this.a + this.b // is this possible ? ( or even myObject.a + myObject.c)
});

I know I could just declare it as below but is it possible as above?

myObject.c = myObject.a + myObject + b;

@VisioN — Presumably, he has, and it hasn't worked, so he is asking if there is some other syntax that does work. — Quentin, May 22 '13 at 12:39
The code in the linked dupe is almost identical to yours, did you copy it from there? — Shadow The GPT Wizard, May 22 '13 at 12:41
@ShadowWizard That doesn't really make sense until you finally answer your own question and get rep out of that. — VisioN, May 22 '13 at 12:42
@Quentin That may be. I think you shouldn't delete the answer, even though the question is duplicate. — VisioN, May 22 '13 at 12:44
That "duplicate question" wasn't listed in the suggested questions when I posted this question. @VisioN You are correct, I have tried both in jsfiddle but no joy. — Ian Brindley, May 22 '13 at 12:44
@Ian OK fair enough. You should have said that you did try and what errors you got otherwise it just looks like you're asking before trying. — Shadow The GPT Wizard, May 22 '13 at 12:45
@ShadowWizard Cheers for the notice. Still, amazing coincidence the code is identical to the "dupe" question. — Ian Brindley, May 22 '13 at 12:47

score 1 · Answer 1 · edited May 23 '17 at 11:50

A simple console log should have shown you why your code works but gives a NaN. After modifying your code to the sample below and running it:

var myObject = new Object({
     a: 1,
     b: 2,
     c: console.log(this.a + this.b)
});
myObject.c;

the result was: NaN why? When you created myObject this was bound to the document object which apparently doesn't have properties a and b.Perhaps this will work for you:

var myObject = new Object({
     a: 1,
     b: 2,
     c: function () {
         return this.a + this.b;
     }
});
myObject.c();

Check this out question: stackoverflow.com/questions/133973/ to understand more about this within a javascript object literal

javascript object properties using properties of self

1 Answers1