An iterator that iterates over the elements of this set.
The order of iteration is defined by the individual Set implementation, but must be consistent between changes to the set.
Iterator<E> get iterator => _source.iterator;
© 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/UnmodifiableSetView/iterator.html