main

gistfile1.js

var image = $('img')[0];
  image.src = getRandomCookieImage();
  var button = $('button')[0];

  button.addEventListener('click', function(e){
    hideImage();
  });

  function getRandomCookieImage() {
    var imageArray = [
      'source/images/cookie1.jpg',
      'source/images/cookie2.jpg',
      'source/images/cookie3.jpg',
      'source/images/cookie4.jpg',
      'source/images/cookie5.jpg'
    ];
    var randomNumber = Math.floor(Math.random() * (4 - 0));
    return imageArray[randomNumber]
  }

  function hideImage() {
    var image = $('.group')[0].children[0].children[0];
    image.style.display='none';
    var aside = $('.group')[0].children[1]
    aside.style.clear='both'
  }

  $('.tick').click(function(){
    var icon = this;
    $(icon).addClass('ticked');
  });