Boolean.prototype.valueOf() - JavaScript

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

valueOf()

Return value

The primitive value of the given 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

Specification
ECMAScript® 2026 Language Specification # sec-boolean.prototype.valueof

See also

Object.prototype.valueOf()

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<script> element. JavaScript has changed over many years. This feature represents the oldest language features, such as built-in objects, statements, and operators. Also known as ECMAScript.","name":"JavaScript (initial core language support)"}},"browserCompat":["javascript.builtins.Boolean.valueOf"],"pageType":"javascript-instance-method"}}
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