Number.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 Number
values returns the value of this number.
Try it
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
js
valueOf()
Parameters
None.
Return value
A number representing the primitive value of the specified Number
object.
Description
This method is usually called internally by JavaScript and not explicitly in web code.
Examples
Using valueOf
js
const numObj = new Number(10);
console.log(typeof numObj); // object
const num = numObj.valueOf();
console.log(num); // 10
console.log(typeof num); // number
Specifications
Specification |
---|
ECMAScript® 2025 Language Specification # sec-number.prototype.valueof |
Browser compatibility
Report problems with this compatibility data on GitHubdesktop | mobile | server | ||||||||||||
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valueOf |
Legend
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- 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.