Removes all elements of this set that fail to satisfy test
.
void retainWhere(bool test(E element)) { List toRemove = []; for (E element in this) { if (!test(element)) toRemove.add(element); } removeAll(toRemove); }
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https://api.dartlang.org/stable/2.0.0/dart-collection/SetMixin/retainWhere.html