Reflect.apply

The static Reflect.apply() method calls a target function with arguments as specified.

Syntax

Reflect.apply(target, thisArgument, argumentsList)

Parameters

target

The target function to call.

thisArgument

The value of this provided for the call to target.

argumentsList

An array-like object specifying the arguments with which target should be called.

Return value

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

Exceptions

A TypeError, if the target is not callable.

Description

In ES5, you typically use the Function.prototype.apply() method to call a function with a given this value and arguments provided as an array (or an array-like object).

Function.prototype.apply.call(Math.floor, undefined, [1.75]);

With Reflect.apply this becomes less verbose and easier to understand.

Examples

Using Reflect.apply()

Reflect.apply(Math.floor, undefined, [1.75]); 
// 1;

Reflect.apply(String.fromCharCode, undefined, [104, 101, 108, 108, 111]);
// "hello"

Reflect.apply(RegExp.prototype.exec, /ab/, ['confabulation']).index;
// 4

Reflect.apply(''.charAt, 'ponies', [3]);
// "i"

Specifications

Specification	Status	Comment
ECMAScript 2015 (6th Edition, ECMA-262) The definition of 'Reflect.apply' in that specification.	Standard	Initial definition.
ECMAScript 2017 Draft (ECMA-262) The definition of 'Reflect.apply' in that specification.	Draft

Browser compatibility

See also

• Reflect
• Function.prototype.apply()