JSFiddle - React, Tailwind, and code Playground

JavaScript

// http://daniel.steigerwald.cz (MIT Licensed)

var someFn = function() {};
alert(typeof someFn.prototype == 'object'); // alert true

var Class = function() {};
alert(typeof Class.prototype == 'object'); // alert true

var Number = (5).constructor;
alert(typeof Number.prototype == 'object'); // alert true