[Dart] Overriding hash for Your Own Objects

class Medicine {
  final String itemName; // 제품명
  final String entpName; // 업체명
  final int count;

  @override
  bool operator==(Object other) =>
      other is Medicine && itemName == other.itemName;

  @override
  int get hashCode => Object.hash(itemName, entpName);

 }

For hashCode you can use Object.hash
Even if count is different, as long as itemNamer and entpName are the same, they're treated as the same object

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