Function updateClasses

src/js/utils/classes.js:38–52

(el, add, all)

}

export function updateClasses(el, add, all) {
  // Of the set of 'all' classes, we need the 'add' classes, and only the
  // 'add' classes to be set.
  all.forEach((cls) => {
    if (add.indexOf(cls) === -1 && el.classList.contains(cls)) {
      removeClass(el, cls);
    }
  });

  add.forEach((cls) => {
    if (!el.classList.contains(cls)) {
      addClass(el, cls);
    }
  });
}