files/en-us/web/javascript/reference/global_objects/number/valueof/index.md

metadata

title: Number.prototype.valueOf()
short-title: valueOf()
slug: Web/JavaScript/Reference/Global_Objects/Number/valueOf
page-type: javascript-instance-method
browser-compat: javascript.builtins.Number.valueOf
sidebar: jsref

The valueOf() method of {{jsxref("Number")}} values returns the value of this number.

{{InteractiveExample("JavaScript Demo: Number.prototype.valueOf()")}}

const numObj = new Number(42);
console.log(typeof numObj);
// Expected output: "object"

const num = numObj.valueOf();
console.log(num);
// Expected output: 42

console.log(typeof num);
// Expected output: "number"

Syntax

valueOf()

Parameters

None.

Return value

A number representing the primitive value of the specified {{jsxref("Number")}} object.

Description

This method is usually called internally by JavaScript and not explicitly in web code.

Examples

Using valueOf

const numObj = new Number(10);
console.log(typeof numObj); // object

const num = numObj.valueOf();
console.log(num); // 10
console.log(typeof num); // number

Specifications

{{Specifications}}

Browser compatibility

{{Compat}}

See also

• {{jsxref("Object.prototype.valueOf()")}}