Sort guests

guest-sort.js

(function() {
  const getLastName = guest => {
    const title = guest.querySelector('.title-nom-prenom');
    const names = title.textContent.split(' ');
    return names[names.length - 1];
  }
  const isotope = document.querySelector('#isotope-list-invites');
  const guests = Array.prototype.slice.call(isotope.querySelectorAll('a'));
  guests.sort((a, b) => {
    const aLastName = getLastName(a);
    const bLastName = getLastName(b);
    if (aLastName > bLastName) return 1;
    if (bLastName < aLastName) return -1;
    return 0;
  });
  isotope.innerHTML = '';
  isotope.appendChild(guests[0]);
})();

//guests.forEach(guest => guest.remove());