JS: Reflect Object
New in ES2015.
Reflect is the value of the property key "Reflect" of the global object.
console.log ( window["Reflect"] === Reflect ); // true
Type of Reflect is object.
[see JS: Data Types]
// type of Reflect console.log ( typeof Reflect === "object" ); // true console.log ( Object.prototype.toString.call(Reflect) === "[object Object]" ) // true
The parent of Reflect is Object.prototype.
[see JS: Prototype and Inheritance]
[see JS: Object.prototype]
console.log ( Reflect.getPrototypeOf ( Reflect ) === Object.prototype); // true
Purpose of Reflect
The Reflect object is used as namespace to host a group of static functions. (like the Math object. [see JS: Math Object] )
Reflect's methods typically:
- Provides a function form of operators. For example,
Reflect.get ( obj, key )is the same asobj[key] - Provide a more strict/improved version of existing methods. For example,
Reflect.getPrototypeOf(obj)is same asObject.getPrototypeOf(obj), but will throw error if obj is not a object type.
[see JS: Object Object]
[see JS: Function Object]
Properties
Reflect.get ( obj, key , receiver )Reflect.set ( obj, key, val, receiver )Reflect.has ( obj, key )
Reflect.defineProperty ( obj, key, attributes )Reflect.deleteProperty ( obj, key )Reflect.getOwnPropertyDescriptor ( obj, key )
Reflect.ownKeys ( obj )Reflect.enumerate ( obj )
Reflect.getPrototypeOf ( obj )Reflect.setPrototypeOf ( obj, proto )
Reflect.isExtensible (obj)Reflect.preventExtensions ( obj )
Reflect.apply ( f, this_binding, argList )Reflect.construct ( constructor, argList [, newTarget] )
Reflect.get
[see JS: Reflect.get]
Reflect.set
[see JS: Reflect.set]
Reflect.has
[see JS: Reflect.has]
Reflect.defineProperty
[see JS: Reflect.defineProperty]
Reflect.deleteProperty
[see JS: Reflect.deleteProperty]
Reflect.getOwnPropertyDescriptor
[see JS: Reflect.getOwnPropertyDescriptor]
Reflect.ownKeys
[see JS: Reflect.ownKeys]
Reflect.enumerate
[see JS: Reflect.enumerate]
Reflect.getPrototypeOf
[see JS: Reflect.getPrototypeOf]
Reflect.setPrototypeOf
[see JS: Reflect.setPrototypeOf]
Reflect.isExtensible
[see JS: Reflect.isExtensible]
Reflect.preventExtensions
[see JS: Reflect.preventExtensions]
Reflect.apply
[see JS: Reflect.apply]
Reflect.construct
[see JS: Reflect.construct]