fill tables with users

function fill(name) {
  const rooms = document.querySelectorAll('.sidebar .table');
  if (name) {
    var room = [...rooms].find(r => r.innerHTML.match(name));
  } else {
    var room = rooms[Math.random() * rooms.length | 0];
  }
  let seat = room.querySelector('.participant.is-empty');
  if (!seat) {
    const oldSeat = room.querySelector('.participant');
    seat = oldSeat.cloneNode(oldSeat);
    seat.removeChild(seat.querySelector(".avatar"));
    oldSeat.parentNode.appendChild(seat);
  }
  seat.style.backgroundImage = `url(https://randomuser.me/api/portraits/${Math.random() > 0.5 ? 'men' : 'women'}/${Math.random() * 100 | 0}.jpg)`;
  seat.classList.remove('is-empty');
  seat.style.backgroundSize = 'cover';
}
for (let i=0; i< 100; i++) {fill()}