JSFiddle - React, Tailwind, and code Playground

JavaScript

function myString (value) {
    this.actualValue = value;
}

myString.prototype.toString = function() {
    console.log("Inside myString.toString, returning", this.actualValue);
    return this.actualValue;
};

function getUser() {
    var myUser = new myString("Bruce Wayne");
    myUser.extraData = "I am BatMan!";
    return myUser;
}

alert(getUser());