dispatching.js

import sleep from 'utils/sleep';

const SONG_DELAY_TIME = 400;
export const sing = payload => async (dispatch, getState) => {
  dispatch(startSong());
  const { match } = getState();
  for (let i = 0; i <= match.all.length - 1; i++) {
    const id = match.all[i];
    dispatch(lightenPad({ id }));
    await sleep(SONG_DELAY_TIME); // sleep time during note play
    dispatch(lightenOffPad());
    await sleep(SONG_DELAY_TIME); // sleep time before next note
  }

  dispatch(finishSong());
}