extension ListExtension<E> on List<E> {
  bool containsAll(List<E> otherList) {
    List<bool> checks = [];
    //
    for (E thisElement in otherList) {
      checks.add(contains(thisElement));
    }
    return !checks.contains(false);
  }

  List<E> getUnique() {
    List<E> uniqueItems = [];
    for (E thisElement in this) {
      if (!uniqueItems.contains(thisElement)) {
        uniqueItems.add(thisElement);
      }
    }
    return uniqueItems;
  }
}