Reflect.set()

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

Syntax

Reflect.set(target, propertyKey, value)
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 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.

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()

// Object
let obj = {}
Reflect.set(obj, 'prop', 'value')  // true
obj.prop  // "value"

// Array
let 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".
let obj = {}
Reflect.set(obj)  // true
Reflect.getOwnPropertyDescriptor(obj, 'undefined')
// { value: undefined, writable: true, enumerable: true, configurable: true }

Specifications

Specification
ECMAScript Language Specification # sec-reflect.set

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