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

metadata

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

The valueOf() method of {{jsxref("Boolean")}} values returns the primitive value of a {{jsxref("Boolean")}} object.

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

const x = new Boolean();

console.log(x.valueOf());
// Expected output: false

const y = new Boolean("Mozilla");

console.log(y.valueOf());
// Expected output: true

Syntax

valueOf()

Parameters

None.

Return value

The primitive value of the given {{jsxref("Boolean")}} object.

Description

The valueOf() method of {{jsxref("Boolean")}} returns the primitive value of a Boolean object or literal Boolean as a Boolean data type.

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

Examples

Using valueOf()

const x = new Boolean();
const myVar = x.valueOf(); // assigns false to myVar

Specifications

{{Specifications}}

Browser compatibility

{{Compat}}

See also

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