Obsolete since Gecko 2 (Firefox 4 / Thunderbird 3.3 / SeaMonkey 2.1)
This feature is obsolete. Although it is still supported by browsers, its usage is discouraged in new projects. 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 |