Playing with Codable

AaronCodableBook.swift

import UIKit

struct JSONBook: Codable {
    let book: Book
}

// MARK: - Book
struct Book: Codable {
    let isbn, language, binding, publisher: String
    let dimensions: String
    let image: String
    let publishDate, title: String
    let authors: [String]
    let pages: Int
    let subjects: [String]
    let titleLong, edition, msrp, format: String
    let isbn13, synopsys, datePublished: String

    enum CodingKeys: String, CodingKey {
        case isbn, language, binding, publisher, dimensions, image
        case publishDate = "publish_date"
        case title, authors, pages, subjects
        case titleLong = "title_long"
        case edition, msrp, format, isbn13, synopsys
        case datePublished = "date_published"
    }
}




let json = """
{  "book" : {    "isbn" : "0596007124",    "language" : "Eng English",    "binding" : "Paperback",    "publisher" : "O'reilly Media",    "dimensions" : "xxxvi, 638 p. : ill.",    "image" : "https://images.isbndb.com/covers/71/26/9780596007126.jpg",    "publish_date" : "2004",    "title" : "Head First Design Patterns: A Brain-friendly Guide",    "authors" : [      "Eric Freeman",      "Bert Bates",      "Kathy Sierra",      "Elisabeth Robson"    ],    "pages" : 694,    "subjects" : [      "Computer software--Development",      "Java (Computer program language)",      "QA76.76.D47 H427 2004"    ],    "title_long" : "Head First Design Patterns: A Brain-friendly Guide",    "edition" : "1",    "msrp" : "69.99",    "format" : "print",    "isbn13" : "9780596007126",    "synopsys" : "Welcome To Design Patterns -- Keeping Your Objects In The Know -- Decorating Objects -- Baking With Oo Goodness -- One Of A Kind Objects -- Encapsulating Invocation -- Being Adaptive -- Encapsulating Algorithms -- Well-managed Collections -- The State Of Things -- Controlling Object Access -- Patterns Of Patterns -- Patterns In The Real World -- Appendix: Leftover Patterns. Eric Freeman, Elisabeth Freeman, With Kathy Sierra And Burt Bates. Includes Index.",    "date_published" : "2004"  }}
"""


let jsonFail = "gotas"

let textDataOpenApi = json.data(using: .utf8)
let textDataISBN = json.data(using: .utf8)

var foundISBNBook: JSONBook?
var foundOpenApiBook: JSONBook?

if let textData = textDataOpenApi {
    foundOpenApiBook = try? JSONDecoder().decode(JSONBook.self, from: textData)
}

if let textData = textDataISBN {
    foundISBNBook = try? JSONDecoder().decode(JSONBook.self, from: textData)
}

if foundISBNBook != nil {
    print("ISBN IS THE WINNER")
} else if foundOpenApiBook != nil {
    print("Open is runner up")
} else {
    print("no books")
}