JSFiddle - React, Tailwind, and code Playground

JavaScript

function Inherited() {};
function Custom() {};

Custom.prototype.toString = function () {
    return 'Custom toString';
}

var i = new Inherited();
var c = new Custom();

console.log(i.toString());
console.log(i + '');

console.log(c.toString());
console.log(c + '');