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JavaScript | Reflect.apply() Method

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  • Last Updated : 29 Sep, 2021

The Reflect.apply() method is a standard build-in object in JavaScript which is used to call a function using the specified argument. It works similar to the Function.prototype.apply() method to call a function, but in a efficient manner and easy to understand.
Syntax: 
 

Reflect.apply(target, thisArgument, argumentsList)

Parameter: This method accepts three parameters as mentioned above and described below: 
 

  • target: This parameter is the target function which is going to be called.
  • thisArgument: This parameter has the this value which is required for the calling the target function.
  • ArgumentsList: This parameter is an array-like object specifying the argument with which target should be called.

Return Value: Calling the given Target function resulted in the specified this value and arguments.
Exceptions: A TypeError is exception given as the result, when the target is not callable.
Below examples illustrate the Reflect.apply() Method in JavaScript:
Example 1: List argument is passed and dictionary – object is created. 
 

javascript




function geeks1 (a, b, c) { 
    this.x = a; 
    this.y = b; 
    this.z = c; 
}const obj = {}; 
Reflect.apply ( geeks1 , obj, [12,42,32] ); 
console.log( obj ); 

Output: 
 

{ x: 12, y: 42, z: 32 }

Example 2: In this example, the empty list argument is passed and the function is called. And the second portion contains mathematical computation, finding the minimum element from the list. 
 

javascript




var geeks2 = function() { console.log(this); } 
Reflect.apply(geeks2, 'GeeksforGeeks', []); 
   
var list= [31, 45, 143, 5]; 
console.log(Reflect.apply(Math.min, undefined, list));

Output: 
 

String { "GeeksforGeeks" }
5

Example 3: 
 

javascript




// Converting the list of integer into char string
console.log(Reflect.apply(String.fromCharCode,
    undefined, [103, 101, 101, 107, 115, 102,
          111, 114, 103, 101, 101, 107, 115]))
  
// Extract the indexed value of string(character)
console.log(Reflect.apply(''.charAt, 'shubham', [3]))

Output: 
 

geeksforgeeks
b

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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