hash method

*<Null safety>*

• @override

int hash (Iterable<E>? elements) override

Implementation

@override
int hash(Iterable<E>? elements) {
  if (elements == null) return null.hashCode;
  // Jenkins's one-at-a-time hash function.
  var hash = 0;
  for (var element in elements) {
    var c = _elementEquality.hash(element);
    hash = (hash + c) & _HASH_MASK;
    hash = (hash + (hash << 10)) & _HASH_MASK;
    hash ^= (hash >> 6);
  }
  hash = (hash + (hash << 3)) & _HASH_MASK;
  hash ^= (hash >> 11);
  hash = (hash + (hash << 15)) & _HASH_MASK;
  return hash;
}