Counting length of Objects in JavaScript

Asked Jul 21 '13 at 17:57

Active Jul 21 '13 at 18:07

Viewed 44 times

I have an object, that will have variable number of other objects in it. In other words I have a container Object, that has other children object in it. Children do have their own properties.

I need to find a number of children objects in it, for that I found two ways of doing it. I am interested which one is the best practice way.

First way:

var numberOfChildren = Object.keys(parentObject).length;

Second way:

var tempP = parentObject
            var count = 0;
            for (var p in tempP) {
                if (tempP.hasOwnProperty(p)) {
                    count++;
                }
                alert(count)
            }

Third Way:

var sizeofChildren= _.size(parentObject);

I have added the third way as well Ideas?

edited Jul 21 '13 at 18:07

asked Jul 21 '13 at 17:57

Emilly

obviously the 1st one..less work,less lines!!! – HIRA THAKUR Jul 21 '13 at 17:59
@MESSIAH yeah sure. In a perfect world... However if OP needs to support browsers I would say no – PeeHaa Jul 21 '13 at 17:59
1

@PeeHaa The `Object.keys` method can easily be polyfilled. – Rob W Jul 21 '13 at 18:02
Well yes so is `forEach`. Not sure if that is what OP is asking about. I might be wrong though – PeeHaa Jul 21 '13 at 18:05

Counting length of Objects in JavaScript

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