how to get size or count the number of properties of an object?

Question

Is there any method to count number of properties (or size) of an object (don't want to use any loop) ?

Suppose i have an object obj as,

obj={id:'0A12',name:'nishant',phone:'mobile'};

Then is there any method which results 3 in this case ?

http://jsfiddle.net/5uFgu/ – HIRA THAKUR Jul 31 '13 at 06:32 — HIRA THAKUR, Jul 31 '13 at 06:32

T.J. Crowder · Accepted Answer · 2013-07-31T06:32:07.647

Object.keys returns an array containing the names of the object's own enumerable properties, so:

var count = Object.keys(obj).length;

Note that there may well be a loop involved (within Object.keys), but at least it's within the JavaScript engine. Object.keys was added by ES5, so older browsers may not have it (it can be "shimmed," though; search for "es5 shim" for options).

Note that that's not quite the same list of properties that for-in iterates, as for-in includes properties inherited from the prototype.

I don't believe there's any way to get a list of the object's non-enumerable properties (that would be the point of them!).

score 2 · Answer 2 · answered Jul 31 '13 at 06:27

2

You can use Object.keys() in modern browsers

Object.keys(obj).length

answered Jul 31 '13 at 06:27

Arun P Johny

365,836
60
503
504

score -1 · Answer 3 · answered Jul 31 '13 at 06:30

-1

You can use

Object.keys(obj).length;

P.S. Only in modern browsers.

answered Jul 31 '13 at 06:30

Murtaza Khursheed Hussain

14,714
7
52
78

1

just asking..how is this different from @Arun P Johny answer.. – HIRA THAKUR Jul 31 '13 at 06:37
1

Might have been posted before seeing that answer. Shows only 3 min difference between the posts. – noboundaries Jul 31 '13 at 10:22

how to get size or count the number of properties of an object?

3 Answers3