how to appendChild in javascript es6 code example

Example 1: appendchild javascript

function createMenuItem(name) {
    let li = document.createElement('li');
    li.textContent = name;
    return li;
}
// get the ul#menu
const menu = document.querySelector('#menu');
// add menu item
menu.appendChild(createMenuItem('Home'));
menu.appendChild(createMenuItem('Services'));
menu.appendChild(createMenuItem('About Us'));

Example 2: appendchild on specific position

parentElement.insertBefore(newElement, parentElement.children[2]);