JSFiddle - React, Tailwind, and code Playground

JavaScript

function Profile(u) {
    this.user = u;
    this.getUser = function () {
        return this.user;
    };
}
 
 var obj = {user : "rajinikanth"}
 
 var v = new Profile("default");
 console.log(v.getUser()); //prints default
 
 console.log(v.getUser.call(obj)); //prints rajini
 
 console.log(Profile.hasOwnProperty("call"));   
 console.log(Profile.__proto__.hasOwnProperty("call"));
 console.log(Profile.__proto__ === Function.prototype);