medium-codable-animal.swift

let exampleData = """
[
  {
    "type": "cat",
    "name": "Kitty",
  },
  {
    "type": "dog",
    "name": "Doggy",
  }
]
""".data(using: .utf8)!

protocol Animal: CustomDebugStringConvertible {
  var name: String { get }
  var debugDescription: String { get }
}

extension Animal {
  var debugDescription: String {
    return "\(type(of: self)) name: \(name)"
  }
}

struct Cat: Animal, Decodable {
  let name: String
  func purr() {
    // purr
  }
}

struct Dog: Animal, Decodable {
  let name: String
  func bark() {
    // bark
  }
}