NodeList object in javascript

A NodeList is collection of DOM elements. It’s like an array (but it isn’t). To work with it, you must turn it into a regular JavaScript array. The following snippet can get the job done for you.

const nodeList = document.getElementsByClassName('.yourClass'),
      nodeArray = [].slice.call(nodeList);

UPDATE:

// newer syntax
const nodeList = Array.from(document.querySelectorAll('[selector]'))

// or
const nodeList = [...document.querySelectorAll('[selector]')]