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.
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 GitHubdesktop | mobile | server | ||||||||||||
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valueOf |
Legend
Tip: you can click/tap on a cell for more information.
- Full support
- Full support
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.