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.
The valueOf() method of String 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 given String object.
Description
The valueOf() method of String returns the primitive value
of a String object as a string data type. This value is equivalent to
String.prototype.toString().
This method is usually called internally by JavaScript and not explicitly in code.
Examples
Using valueOf()
js
const x = new String("Hello world");
console.log(x.valueOf()); // 'Hello world'
Specifications
| Specification |
|---|
| ECMAScript® 2026 Language Specification # sec-string.prototype.valueof |