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JavaScript Reflect apply() Method

JavaScript Reflect apply() Method with examples on javascript reflect methods, apply() construct(), defineProperty() method, deleteProperty(), get(), getOwnPropertyDescriptor(), getPrototypeOf(), has(), isExtensible(), ownKeys(), setPrototypeOf() etc.

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JavaScript Reflect.apply() Method

The static Reflect.apply() method of JavaScript is used to call a function using the specified argument.

Syntax

Reflect.apply(target, thisArgument, argumentsList)

Parameter

target: It is the target function to call.

thisArgument: It is the value of this provided for the call to target.

ArgumentsList: It is an array-like object specifying the argument with which target should be called.

Return

The result of calling the given target function with the specified this value and arguments.

Exceptions

This method will throw a TypeError if the target is not callable.

Example 1

function g (a, b) {
    this.x = a;
    this.y = b;
}const obj = {};
Reflect.apply ( g , obj, [33,44] );
console.log( obj );

Output:

Object { x: 33, y: 44 }

Example 2

var whatsThis = function() { console.log(this); }
Reflect.apply(whatsThis, 'hello', []);

// Call a function that takes a variable number of args
var numbers = [3, 20, 1, 55];
console.log(Reflect.apply(Math.max, undefined, numbers));

Output:

"hello"
   55

Example 3

console.log(Reflect.apply(Math.floor, undefined, [45]));
console.log(Reflect.apply(String.fromCharCode, undefined, [104, 101,103,105]));
console.log(Reflect.apply(RegExp.prototype.exec, /ab/, ['confabulation']).index);
console.log(Reflect.apply(''.charAt, 'Rahul', [3]));

Output:

    45
   "hegi"
    4
   "u"

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