Access object current during creation possible?

Question

is it possible to access the current object during creation in javascript?

Example:

var data = {x: 1, z:x}

OR

var data = {x: 1, z: data.x}

This code does acutally not work but i wonder if this is possible somehow?

Thanks in advance.

@Hacketo: but that's no more equivalent to the object literal (prototype inheritance, re-constructability etc) — Bergi, Mar 06 '15 at 14:30

patrykf · Accepted Answer · 2015-03-06T14:35:07.237

1

By using constructor function

var data = function() {
    if ( !(this instanceof data ) ) {
        return new data();
    }

    this.y = 3;
    this.x = this.y;
}

var obj = new data()

EDIT: Better practice

edited Mar 06 '15 at 14:35

answered Mar 06 '15 at 14:27

patrykf

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5
19

That was quick! Thanks! – Freddy Mar 06 '15 at 14:29
Regarding your edit: Is this then a singleton? – Freddy Mar 06 '15 at 14:39
2

@Freddi: No, it just lets you call `data` without `new`. I.e. if you call `data()`, it will internally call `return new data();`. – Felix Kling Mar 06 '15 at 14:58

Access object current during creation possible?

1 Answers1