JSFiddle - React, Tailwind, and code Playground

JavaScript

var F = function (name) {
 this.setName(name);
};
F.prototype.setName = function (name) {
 this.name = name;
};
F.prototype.getName = function () {
 return this.name;
};

var obj = new F('Сергей');
console.log(obj.getName());
obj.setName('Андрей');
console.log(obj.getName());

console.log(F.prototype)