The static Reflect.set() method works like setting a property on an object.


Reflect.set(target, propertyKey, value[, receiver])


The target object on which to set the property.
The name of the property to set.
The value to set.
The value of this provided for the call to target if a setter is encountered.

Return value

A Boolean indicating whether or not setting the property was successful.


A TypeError, if target is not an Object.


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.


Using Reflect.set()

// 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 }


Specification Status Comment
ECMAScript 2015 (6th Edition, ECMA-262)
The definition of 'Reflect.set' in that specification.
Standard Initial definition.
ECMAScript Latest Draft (ECMA-262)
The definition of 'Reflect.set' in that specification.

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support491242 No3610
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support4949 Yes4236105.0

See also

Document Tags and Contributors

Contributors to this page: wbamberg, fscholz, jameshkramer, nmve, kdex, bsara, eduardoboucas, gingerik
Last updated by: wbamberg,