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Showing content from https://developer.cdn.mozilla.net/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/valueOf below:

String.prototype.valueOf() - JavaScript | MDN

String.prototype.valueOf()

Baseline Widely available

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 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()
const x = new String("Hello world");
console.log(x.valueOf()); // 'Hello world'
Specifications Browser compatibility See also

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