String.prototype.toString()

Baseline

20157

toString() String

const stringObj = new String("foo");

console.log(stringObj);
// : String { "foo" }

console.log(stringObj.toString());
// : "foo"

toString()

toString() this String this TypeError

String [Symbol.toPrimitive]() JavaScript toString() String toString()

String.prototype.toString = () => "Overridden";
console.log(`${"foo"}`); // "foo"
console.log(`${new String("foo")}`); // "Overridden"

const x = new String("Hello world");

console.log(x.toString()); // "Hello world"


ECMAScript 2027 LanguageSpecification # sec-string.prototype.tostring

MDN

MDN 2025822

GitHub