JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.4/themes/ui-lightness/jquery-ui.css">

JavaScript

var employees = [
    {
    "dept": "accounting", // new property for this object
    "firstName": "John",
    // First element
    "lastName": "Doe",
    "age": 23},

{
    "dept": "accounting", // new property for this object
    "firstName": "Mary",
    // Second Element
    "lastName": "Smith",
    "age": 32},

{
    "dept": "sales", // new property for this object
    "firstName": "Sally",
    // Third Element
    "lastName": "Green",
    "age": 27},

{
    "dept": "sales", // new property for this object
    "firstName": "Jim",
    // Fourth Element
    "lastName": "Galley",
    "age": 41}
];

document.body.innerHTML = employees[0].firstName;

document.body.innerHTML += '<br>';

document.body.innerHTML += employees[1].firstName;