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Number.prototype.valueOf() - JavaScript | MDN
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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® 2026 Language Specification # sec-number.prototype.valueof |
Browser compatibility
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