I have an array of books aka struct Book in the Top100Model below. I also have an array of books aka struct Data as well in the ISBNModel below. Both arrays have the same number of books and have a common property isbn13 which is a string holding a number. Id like to either merge the arrays so that it contains all the properties from Book in the Top100Model but add another two properties from the ISBNModel and copies the ‘subjects’ and ‘synopsis’ properties from the ISBNModel to this Top100Model based on the matching isbn13 values or merge them into a new dictionary. The code below to merge the arrays is returning empty

@State var mergedBooks = [T100FictMergeWithISBNDbyISBN13]()
@State var bookFromTop100Fiction = [Book]()
@State var bookFromISBNDBbyISBN13 = [Data]()

print(mergedBooks)

Top100Model below

struct Top100Model: Decodable {
  let results: Result

  private enum CodingKeys: String, CodingKey {
    case results
  }
}

struct Result: Decodable {
  let listsb: [ListB]

  private enum CodingKeys: String, CodingKey {
      case listsb = "lists"
  }
}

struct ListB: Codable {
  let books: [Book]
}

struct Book: Codable, Identifiable {
  let id = UUID()
  let author: String
  let description: String
  let isbn13: String
  let rank: Int
  let title: String
}

ISBNModel Below

struct ISBNModel: Codable {
  let total: Int
  let requested: Int
  let data: [Data]

}

struct Data: Codable {
  let synopsis: String
  let subjects: [String]
  let isbn13: String

Merged model below

struct T100FictMergeWithISBNDBbyISBN13 {
    let t100: Book
    var isbndb: Data?

    init(t100: Book) {
        self.t100 = t100
    }

    var id: String {
        return t100.isbn13
    }

    mutating func merge(status: Data) {
        guard self.id == status.isbn13 else { return }
        self.isbndb = status
    }
}