HashSet<E>.from constructor
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.
All the elements
should be instances of E
.
The elements
iterable itself may have any element type, so this
constructor can be used to down-cast a Set
, for example as:
Set<SuperType> superSet = ...;
Set<SubType> subSet =
new HashSet<SubType>.from(superSet.whereType<SubType>());
Implementation
factory HashSet.from(Iterable elements) {
HashSet<E> result = new HashSet<E>();
for (final e in elements) {
result.add(e);
}
return result;
}