JSFiddle - React, Tailwind, and code Playground

HTML

please see console log

JavaScript

var foo = { ha: 123 };

var bar = Object.create(foo);

bar.hee = 456;


console.log(foo.propertyIsEnumerable("ha"));

console.log(bar.propertyIsEnumerable("hee"));
console.log(bar.propertyIsEnumerable("ha"));
console.log(bar.propertyIsEnumerable("rahrahrah"));

for (p in bar) { console.log("this property is enumerable:", p); }