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# Lang
The `Lang` module is a collection of deprecated features that have been
completely superseded by standard ECMAScript. It remains a part of GJS for
backwards-compatibility reasons, but should never be used in new code.
#### Import
> Attention: This module is not available as an ECMAScript Module
The `Lang` module is available on the global `imports` object:
```js
const Lang = imports.lang
```
### Lang.bind(thisArg, function, ...args)
> Deprecated: Use [`Function.prototype.bind()`][function-bind] instead
Type:
* Static
Parameters:
* thisArg (`Object`) — A JavaScript object
* callback (`Function`) — A function reference
* args (`Any`) — A function reference
Returns:
* (`Function`) — A new `Function` instance, bound to `thisArg`
Binds a function to a scope.
[function-bind]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Function/bind
### Lang.Class(object)
> Deprecated: Use native [JavaScript Classes][js-class] instead
Type:
* Static
Parameters:
* object (`Object`) — A JavaScript object
Returns:
* (`Object`) — A JavaScript class expression
...
Example usage:
```js
const MyLegacyClass = new Lang.Class({
_init: function() {
let fnorb = new FnorbLib.Fnorb();
fnorb.connect('frobate', Lang.bind(this, this._onFnorbFrobate));
},
_onFnorbFrobate: function(fnorb) {
this._updateFnorb();
}
});
```
[js-class]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Classes
### Lang.copyProperties(source, dest)
> Deprecated: Use [`Object.assign()`][object-assign] instead
Type:
* Static
Parameters:
* source (`Object`) — The source object
* dest (`Object`) — The target object
Copy all properties from `source` to `dest`, including those that are prefixed
with an underscore (e.g. `_privateFunc()`).
[object-assign]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object/assign
### Lang.copyPublicProperties(source, dest)
> Deprecated: Use [`Object.assign()`][object-assign] instead
Type:
* Static
Parameters:
* source (`Object`) — The source object
* dest (`Object`) — The target object
Copy all public properties from `source` to `dest`, excluding those that are
prefixed with an underscore (e.g. `_privateFunc()`).
[object-assign]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object/assign
### Lang.countProperties(object)
> Deprecated: Use [`Object.assign()`][object-assign] instead
Type:
* Static
Parameters:
* object (`Object`) — A JavaScript object
[object-assign]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object/assign
### Lang.getMetaClass(object)
Type:
* Static
Parameters:
* object (`Object`) — A JavaScript object
Returns:
* (`Object`|`null`) — A `Lang.Class` meta object
...
### Lang.Interface(object)
> Deprecated: Use native [JavaScript Classes][js-class] instead
Type:
* Static
Parameters:
* object (`Object`) — A JavaScript object
Returns:
* (`Object`) — A JavaScript class expression
...
[js-class]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Classes
|
