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Obsolete since Gecko 2 (Firefox 4 / Thunderbird 3.3 / SeaMonkey 2.1)
This feature is obsolete. Although it may still work in some browsers, its use is discouraged since it could be removed at any time. Try to avoid using it.
The __count__ property used to store the count of enumerable properties on the object, but it has been removed.
Syntax
obj.__count__
Examples
{ 1: 1 }.__count__ // 1
[].__count__ // 0
[1].__count__ // 1
[1, /* hole */, 2, 3].__count__ // 3
Specifications
Not part of any specification.
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
| Feature | Chrome | Edge | Firefox | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|---|
| Basic Support | No | No | No | No | No | No |
| Feature | Android | Chrome for Android | Edge mobile | Firefox for Android | IE mobile | Opera Android | iOS Safari |
|---|---|---|---|---|---|---|---|
| Basic Support | No | No | No | No | No | No | No |