removeNullsAndDuplicates method

IList<T> removeNullsAndDuplicates()

Removes duplicates (but keeps items which appear only once, plus the first time other items appear).

Implementation

IList<T> removeNullsAndDuplicates() {
  LinkedHashSet<T> set = _l.toLinkedHashSet();
  set.remove(null);
  return IList<T>.withConfig(set, config);
}