JSFiddle - React, Tailwind, and code Playground

JavaScript

class User {
	constructor(name, type = 'simpleUser') {
		this.name = name;
		this.type = type;
		this.id = User.prototype._quantity;
		User.prototype._quantity++;
	}
}

User.prototype._quantity = 0;

let hello1 = new User('Zed');
let hello2 = new User('Alpha');
let hello3 = new User('Omega');
alert(hello1.id);
alert(hello2.id);
alert(hello3.id);