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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.
receiver Optional
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

Update compatibility data on GitHub
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung InternetNode.js
setChrome Full support 49Edge Full support 12Firefox Full support 42IE No support NoOpera Full support 36Safari Full support 10WebView Android Full support 49Chrome Android Full support 49Firefox Android Full support 42Opera Android Full support 36Safari iOS Full support 10Samsung Internet Android Full support 5.0nodejs Full support 6.0.0


Full support  
Full support
No support  
No support

See also