Jokes-Codable.swift

struct ChuckJokes : Decodable {

        let type : String?
        let value : [ChuckValue]?

        enum CodingKeys: String, CodingKey {
                case type = "type"
                case value = "value"
        }
    
        init(from decoder: Decoder) throws {
                let values = try decoder.container(keyedBy: CodingKeys.self)
                type = try values.decodeIfPresent(String.self, forKey: .type)
                value = try values.decodeIfPresent([ChuckValue].self, forKey: .value)
        }

}

struct ChuckValue : Decodable {

        let id : Int?
        let joke : String?

        enum CodingKeys: String, CodingKey {
                case id = "id"
                case joke = "joke"
        }
    
        init(from decoder: Decoder) throws {
                let values = try decoder.container(keyedBy: CodingKeys.self)
                id = try values.decodeIfPresent(Int.self, forKey: .id)
                joke = try values.decodeIfPresent(String.self, forKey: .joke)
        }
}