Boolean.prototype.valueOf()

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

The valueOf() method of Boolean values returns the primitive value of a Boolean object.

Try it

const x = new Boolean();

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

const y = new Boolean("Mozilla");

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

Syntax

js
valueOf()

Parameters

None.

Return value

The primitive value of the given Boolean object.

Description

The valueOf() method of 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()

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

Specifications

Specification
ECMAScript® 2025 Language Specification
# sec-boolean.prototype.valueof

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobileserver
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
Deno
Node.js
valueOf

Legend

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Full support
Full support

See also