Length of an object filled with objects?

Question

I've got an object filled with objects and I want to know how many items are in it. How can I do this with JS? Also running jQuery in the page.

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score 6 · Accepted Answer · edited May 23 '17 at 10:30

6

Try this:

function countProperties(obj) {
    var count = 0;

    for (var prop in obj) {
        if (obj.hasOwnProperty(prop))
            ++count;
    }

    return count;
}

See also: Number of elements in a javascript object

edited May 23 '17 at 10:30

Community

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answered Apr 04 '11 at 23:23

Kevin Ji

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You're welcome, glad to help. And by the way, it would be appreciated if you accepted my answer. Thanks. – Kevin Ji Apr 04 '11 at 23:30
Just did, sorry you were too fast and I had to wait out the 5 min clock :) – wesbos Apr 05 '11 at 03:37

score 0 · Answer 2 · edited May 23 '17 at 12:02

0

For ECMAScript 5-compatible agents, for example Chrome, try this:

var obj = {a:1, b:2, c:3};
console.log('Your object has ' + Object.keys(obj).length + ' elements in it');

// Your object has 3 elements in it

See also here.

Cheers

edited May 23 '17 at 12:02

Community

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answered May 31 '12 at 22:51

Madbreaks

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score -1 · Answer 3 · answered Apr 04 '11 at 23:20

-1

"object filled with objects" is more commonly known as an array. Anyway:

yourObject.length

answered Apr 04 '11 at 23:20

Jim Blackler

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An array is also an object. `b = new Array(); typeof b` displays `"object"` – Jim Blackler Apr 04 '11 at 23:25
See my answer below; by "array" I mean the "Array()" object https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array And also, length is a property of only the Array object, not the Object object – Kevin Ji Apr 04 '11 at 23:26
I wholeheartedly disagree. yes, an array is an object. no, an object is not an array. `var x = {a:1}; console.log(x.length); // undefined` – Madbreaks May 31 '12 at 22:44

Length of an object filled with objects?

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