JS: Difference Between String() vs new String()

both converts any value to a string. one returns a string primitive, the other returns a string object.

• String(arg) return a Primitive Value. The result is type "string".
• new String(arg) return a Array-Like Object, with integer keys, and values of String Code Unit (characters if the arg is all ASCII Characters) The result is type "object".

const xx = "abc";
const yy = String(xx);

console.log(yy === xx);
console.log(typeof yy === "string");

const xx = "abc";
const yy = new String(xx);

console.log(typeof yy === "object");
console.log(Array.isArray(yy) === false);

back to JS: String Constructor