Свойство hasNext

bool hasNext

Источник

bool get hasNext {
  if (_state == _NOT_MOVED_YET) _move();
  return _state == _HAS_NEXT_AND_NEXT_IN_CURRENT;
}

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Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dartlang.org/stable/1.24.3/dart-collection/HasNextIterator/hasNext.html