JSFiddle - React, Tailwind, and code Playground
JavaScript
var ctor = function() {
};
var x = new ctor();
var y = { z: undefined };
var z = { something : "cool" };
document.write(jQuery.isEmptyObject(x));
document.write("<br/>");
document.write(jQuery.isEmptyObject(y));
document.write("<br/>");
x.prototype = z;
document.write(jQuery.isEmptyObject(x));