Hashable にする最小限

swift

struct Test01: Identifiable, Hashable {
	var id = UUID()

	static func == (lhs: Self, rhs: Self) -> Bool {
		return lhs.id == rhs.id
	}
	func hash(into hasher: inout Hasher) {
		hasher.combine(id)
	}
}

複数キーがある場合はこんな感じ

swift

struct AreaNode: Hashable {
 var name: String
 var type: AreaNodeType
 
 static func == (lhs: Self, rhs: Self) -> Bool {
  lhs.name == rhs.name
  && lhs.type == rhs.type
 }
 func hash(into hasher: inout Hasher) {
  hasher.combine(name)
  hasher.combine(type)
 }
}