Метод clear

void clear()

override

Удаляет все элементы из множества.

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

Реализация

void clear() {
  _clear();
}

© 2012 the Dart project authors
Licensed under the BSD 3-Clause "New" or "Revised" License.
https://api.dart.dev/stable/2.18.5/dart-collection/SplayTreeSet/clear.html