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This feature is obsolete.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.
Summary
The __count__ property used to store the count of enumerable properties on the object, but it has been removed.
Syntax
obj.__count__Example
{ 1: 1 }.__count__ // 1
[].__count__ // 0
[1].__count__ // 1
[1, /* hole */, 2, 3].__count__ // 3
Specifications
Not part of any specifications.
Browser compatibility
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|
| Basic support | Not supported | Not supported | Not supported | Not supported | Not supported |
| Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|
| Basic support | Not supported | Not supported | Not supported | Not supported | Not supported | Not supported |