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/Dart 2

dart:collection

union method

Set<E> union (Set<E> other)

Implementation 

Set<E> union(Set<E> other) {
  return _clone()..addAll(other);
}

© 2012 the Dart project authors
Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dartlang.org/stable/2.0.0/dart-collection/SplayTreeSet/union.html