Get DOM elements quickly

getDOMElement.js

var el = function (element) {
  if (element.charAt(0) === "#") {
    
    // If passed an ID...
    
    return document.querySelector(element); // ... returns single element
  }
    
  return document.querySelectorAll(element); // Otherwise, returns a nodelist
};

// reference: https://codepen.io/giana/pen/GJMBEv