Adds all elements
to this Set.
Equivalent to adding each element in elements
using add, but some collections may be able to optimize it.
void addAll(Iterable<E> elements) { for (E element in elements) { int compare = _splay(element); if (compare != 0) { _addNewRoot(_SplayTreeNode(element), compare); } } }
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https://api.dart.dev/stable/2.5.0/dart-collection/SplayTreeSet/addAll.html