JavaScript Reflect.set() method in JavaScript is used to set the value of an object property. It returns a Boolean value true if the property is successfully set else it returns false.
Syntax:
Reflect.set(obj, Key, value, receiver)
Parameters: This method accepts four parameters as mentioned above and described below:
- Obj: This parameter holds the target object and it is used to set the property.
- Key: This parameter holds the name of the property to be set.
- value: This parameter holds the value to be set.
- Receiver: It is an optional parameter and the value of this is provided for the call to target if a setter is encountered.
Return value: This method returns a Boolean value which indicates whether the property was successfully set.
Exceptions: A TypeError is an exception given as the result when the target is not an Object.
The below examples illustrate the Reflect.set() method in JavaScript:
Example 1: In this example, we will try to set the value of some property in an object and check for the output using Reflect.set() method in JavaScript.
javascript
const object1 = {};Reflect.set(object1, 'property1', "NULL");console.log(object1.property1);const array1 = ['neveropen', 'valt', 'neveropen'];Reflect.set(array1, 2, 'for');console.log(array1[2]);const val1 = {};const val2 = {};Reflect.set(val1, 'prop1', 45);console.log(val1.prop1);Reflect.set(val2, 'prop2', 567);console.log(val2.prop2); |
NULL for 45 567
Example 2: In this example, we will try to set the value of some property in an object and check for the output using Reflect.set() method in JavaScript.
javascript
let obj1 = {}console.log(Reflect.set(obj1, 'prop', 'value'));console.log(obj1.prop);// Initializing an arraylet arr = ['geek1', 'geek2', 'geek3']console.log(Reflect.set(arr, 2, 'geek4'));console.log(arr[2]);// It can truncate an array.console.log(Reflect.set(arr, 'length', 1));console.log(arr);// With just one argument, propertyKey// and value are "undefined".let obj = {}console.log(Reflect.set(obj));console.log(Reflect.getOwnPropertyDescriptor( obj, 'undefined')); |
true
value
true
geek4
true
[ 'geek1' ]
true
{
value: undefined,
writable: true,
enumerable: true,
configurable: true
}
Supported Browsers:
The browsers are supported by JavaScript Reflect.set() Methods are listed below:
- Google Chrome 49 and above
- Edge 12 and above
- Firefox 42 and above
- Opera 36 and above
- Safari 10 and above
We have a complete list of Javascript Reflects methods, to check those go through the JavaScript Reflect Reference article.
