addAll method

@override void addAll(Iterable<E> elements)

Adds all elements to this set.

Equivalent to adding each element in elements using add, but some collections may be able to optimize it.

final characters = <String>{'A', 'B'};
characters.addAll({'A', 'B', 'C'});
print(characters); // {A, B, C}

Implementation

@override
void addAll(Iterable<E> elements) {
  for (E element in elements) {
    bool result = _values.add(element);

    // Listen to the element if asked to and if it is possible
    if (result &&
        _propagateNotification &&
        element != null &&
        element is ChangeNotifier) {
      element.addListener(_propagate);
    }
  }

  // Notify only once
  notifyListeners();
}