Reflect.set()
The static Reflect
.set()
method works like setting a property on an object.
Syntax
JavaScript
Copy Code
Reflect.set(target, propertyKey, value[, receiver])
Parameters
target
- The target object on which to set the property.
propertyKey
- The name of the property to set.
- value
- The value to set.
- receiver
- The value of
this
provided for the call totarget
if a setter is encountered.
Return value
A Boolean
indicating whether or not setting the property was successful.
Exceptions
A TypeError
, if target
is not an Object
.
Description
The Reflect.set
method allows you to set a property on an object. It does property assignment and is like the property accessor syntax as a function.
Examples
Using Reflect.set()
JavaScript
Copy Code
// Object var obj = {}; Reflect.set(obj, "prop", "value"); // true obj.prop; // "value" // Array var arr = ["duck", "duck", "duck"]; Reflect.set(arr, 2, "goose"); // true arr[2]; // "goose" // It can truncate an array. Reflect.set(arr, "length", 1); // true arr; // ["duck"]; // With just one argument, propertyKey and value are "undefined". var obj = {}; Reflect.set(obj); // true Reflect.getOwnPropertyDescriptor(obj, "undefined"); // { value: undefined, writable: true, enumerable: true, configurable: true }
Specifications
Specification | Status | Comment |
---|---|---|
ECMAScript 2015 (6th Edition, ECMA-262) The definition of 'Reflect.set' in that specification. |
Standard | Initial definition. |
ECMAScript 2017 Draft (ECMA-262) The definition of 'Reflect.set' in that specification. |
Draft |
Browser compatibility
Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|
Basic support | 49 | 42 (42) | No support | No support | No support |
Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
---|---|---|---|---|---|---|
Basic support | No support | No support | 42.0 (42) | No support | No support | No support |
See also
License
© 2016 Mozilla Contributors
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-us/docs/web/javascript/reference/global_objects/reflect/set