Script for Rachel's English site to play all audio recordings in soundboards session. Each recording will be played 3 times with pauses for you to repeat. How to use: 1. go to page with audio recordings 2. in url type "javascript:" and paste this script after colon 3. hit enter, it should start playing recordings one by one

play_all_audio_files.js

function playAndWait(el) {
  return new Promise((resolve) => {
    el.play().then(() => {
      setTimeout(resolve, (el.duration * 2.5) * 1000);
    });
  });
}

function swapEveryPair(els) {
  const elements = Array.from(els);
  for (let i = 0; i < elements.length; i += 2) {
    const tmp = elements[i];
    elements[i] = elements[i + 1];
    elements[i + 1] = tmp;
  }
  return elements;
}

function playNTimes(audioTag, n) {
  let res = Promise.resolve();
  for (let i = 0; i < n; i++) {
    res = res.then(() => playAndWait(audioTag));
  }
  return res;
}

function playAll(audioTags, timesToPlay) {
  return audioTags.reduce((promise, tag) => {
    return promise.then(() => playNTimes(tag, timesToPlay));
  }, Promise.resolve());
}

function getAllAudio() {
  return Array.from(document.querySelectorAll('audio'));
}

function playAllAudio(timesToPlay) {
  return playAll(swapEveryPair(getAllAudio()), timesToPlay);
}

playAllAudio(3);