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JavaScript | Reflect.construct() Method

  • Last Updated : 29 Sep, 2021

The Reflect.construct() method in JavaScript is used to call a new target. It gives also the added option to specify a different prototype.
Syntax: 
 

Reflect.construct(target, argumentsList, newTarget)

Parameters: This method accept three parameters as mentioned above and described below: 
 

  • target: This parameter is the target function which is going to be called.
  • ArgumentsList: This parameter is an array-like object specifying the argument with which target should be called.
  • newTarget: It is an optional parameter. The constructor whose prototype should be used.

Return Value: This method returns a new instance of the target.
Exceptions: A TypeError is exception given as the result, when the target is not constructor.
Below examples illustrate the Reflect.construct() method in JavaScript:
Example 1: 
 

javascript




function func1(a, b, c) {
  this.sum = a + b + c;
}
 
const args = [1, 2, 3];
const object1 = new func1(...args);
const object2 = Reflect.construct(func1, args);
 
console.log(object2.sum);
 
console.log(object1.sum);
 
function func2(a, b, c) { 
  this.sum = a + b + c; 
const args2 = [1, 4, 3]; 
const args3 = [1, 2, 3]; 
const object3 = new func1(...args); 
const object4 = Reflect.construct(func2, args2); 
console.log(object4.sum); 
console.log(object3.sum); 

Output: 
 

6
6
8
6

Example 2: 
 

javascript




function OneClass() {
    this.name = 'one'
}
 
function OtherClass() {
    this.name = 'other'
}
const args=[1, 2, 3];
 
let obj1 = Reflect.construct(OneClass, args, OtherClass)
 
let obj2 = Object.create(OtherClass.prototype)
OneClass.apply(obj2, args)
 
console.log(obj1.name)
console.log(obj2.name) 
 
console.log(obj1 instanceof OneClass)
console.log(obj2 instanceof OneClass)
 
console.log(obj1 instanceof OtherClass)
console.log(obj2 instanceof OtherClass)

Output: 
 

"one"
"one"
false
false
true
true

Supported Browsers: The browsers supported by JavaScript Reflect.apply() Method are listed below: 
 

  • Google Chrome 49 and above
  • Edge 12 and above
  • Firefox 42 and above
  • Opera 36 and above
  • Safari 10 and above

 


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