addAll method

@override void addAll(Iterable<T> 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<T> elements) {
  final copy = {..._internalSet};
  final initialLength = copy.length;
  copy.addAll(elements);
  if (copy.length != initialLength) {
    _emitSet(copy);
  }
}