Removes all elements of this set that satisfy test.
void removeWhere(bool test(E element)) {
  List toRemove = [];
  for (E element in this) {
    if (test(element)) toRemove.add(element);
  }
  removeAll(toRemove);
}
    © 2012 the Dart project authors
Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
    https://api.dart.dev/stable/2.5.0/dart-collection/SetMixin/removeWhere.html