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

Browser compatibility

BCD tables only load in the browser

See also