*<Null safety>*
bool equals (Set<E>? elements1, Set<E>? elements2) inherited
@override bool equals(T elements1, T elements2) { if (identical(elements1, elements2)) return true; if (elements1 == null || elements2 == null) return false; var counts = HashMap( equals: _elementEquality.equals, hashCode: _elementEquality.hash, isValidKey: _elementEquality.isValidKey); var length = 0; for (var e in elements1) { var count = counts[e] ?? 0; counts[e] = count + 1; length++; } for (var e in elements2) { var count = counts[e]; if (count == null || count == 0) return false; counts[e] = count - 1; length--; } return length == 0; }