JSFiddle - React, Tailwind, and code Playground

HTML

<div id="console"></div>

JavaScript

Foo = new Class({

    // instance variable:
    name: '',

    // construtor:
    initialize: function(name) {
        this._setName(name);
    },

    // instance method:
    getName: function(){
        return this.name;
    },

    // protected instance method:
    _setName: function(name) {
        this.name = name; 
    }.protect()

});

// static variable:
Foo.bar = 'bar';

// static method
Foo.bar = function(){}

// instance object:

var myFoo = new Foo('my new name');
var theName = myFoo.getName();

var checkInstance = instanceOf(myFoo, Foo);

$('console').innerHTML += theName;
$('console').innerHTML += "<br />Is instance: " + checkInstance;