Get Youtube playlist item titles

youtube-playlist-item-titles.js

function getTitles(optionalTrimPrefix) {
  var elems = document.querySelectorAll('#playlist-autoscroll-list .playlist-video-description h4.yt-ui-ellipsis-2');
  var titles = []; 

  for (i = 0; i < elems.length; i++) {
    var text = elems[i].textContent;
    var title = optionalTrimPrefix ? text.substr(optionalTrimPrefix.length) : text;
    if(title) titles.push(title);
  }

  return titles;
}