String.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.
ThevalueOf() method ofString values returns this string value.
Try it
const stringObj = new String("foo");console.log(stringObj);// Expected output: String { "foo" }console.log(stringObj.valueOf());// Expected output: "foo"Syntax
js
valueOf()Parameters
None.
Return value
A string representing the primitive value of a givenString object.
Description
ThevalueOf() method ofString returns the primitive valueof aString object as a string data type. This value is equivalent toString.prototype.toString().
This method is usually called internally by JavaScript and not explicitly in code.
Examples
UsingvalueOf()
js
const x = new String("Hello world");console.log(x.valueOf()); // 'Hello world'Specifications
| Specification |
|---|
| ECMAScript® 2026 Language Specification # sec-string.prototype.valueof |