Reflect.apply()
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2016.
The Reflect.apply() static method calls a target function with arguments as specified.
Try it
console.log(Reflect.apply(Math.floor, undefined, [1.75])); // Expected output: 1 console.log( Reflect.apply(String.fromCharCode, undefined, [104, 101, 108, 108, 111]), ); // Expected output: "hello" console.log( Reflect.apply(RegExp.prototype.exec, /ab/, ["confabulation"]).index, ); // Expected output: 4 console.log(Reflect.apply("".charAt, "ponies", [3])); // Expected output: "i" Syntax
Reflect.apply(target, thisArgument, argumentsList) Parameters
targetThe target function to call.
thisArgumentThe value of
thisprovided for the call totarget.argumentsListAn array-like object specifying the arguments with which
targetshould be called.
Return value
The result of calling the given target function with the specified this value and arguments.
Exceptions
TypeErrorThrown if
targetis not a function orargumentsListis not an object.
Description
Reflect.apply() provides the reflective semantic of a function call. That is, Reflect.apply(target, thisArgument, argumentsList) is semantically equivalent to:
Math.floor.apply(null, [1.75]); Reflect.apply(Math.floor, null, [1.75]); The only differences are:
Reflect.apply()takes the function to call as thetargetparameter instead of thethiscontext.Reflect.apply()throws ifargumentsListis omitted instead of defaulting to calling with no parameters.
Reflect.apply() invokes the [[Call]]object internal method of target.
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 |
|---|
| ECMAScript® 2026 Language Specification # sec-reflect.apply |
