Create a hash set containing all elements
.
Creates a hash set as by new HashSet<E>()
and adds all given elements
to the set. The elements are added in order. If elements
contains two entries that are equal, but not identical, then the first one is the one in the resulting set.
factory HashSet.of(Iterable<E> elements) => new HashSet<E>()..addAll(elements);
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https://api.dartlang.org/stable/2.0.0/dart-collection/HashSet/HashSet.of.html