[Get youtube channel RSS]

index.js

(() => {
let getMeta = (itemProp) => {
  let metas = document.getElementsByTagName('meta');

  for (let i = 0; i < metas.length; i++) {
    if (metas[i].getAttribute('itemprop') === itemProp) {
      return metas[i].getAttribute('content');
    }
  }

  return '';
}

let chanId = getMeta('channelId');
let channelRss = 'https://www.youtube.com/feeds/videos.xml?channel_id=' + chanId;
let channelTitle = document.title.match(/\(?\d*\)?\s?(.*?)\s\-\sYouTube/)[1];

console.log('The rss feed of the channel \'' + channelTitle + '\' is:\n' + channelRss);
})()