Enum Codable synthesis #persistence #swift-api

EnumCodableExample.swift

import Foundation

enum Command: Codable {
  case load(key: String)
  case store(key: String, value: Int)
}

@main
struct Demo {
  static func main() throws {
    let command: Command = .store(key: "volume", value: 10)

    // Encode
    let data = try JSONEncoder().encode(command)
    print(String(data: data, encoding: .utf8)!) 
    // Example output: {"store":{"key":"volume","value":10}}

    // Decode
    let decoded = try JSONDecoder().decode(Command.self, from: data)
    print(decoded) // prints store(key: "volume", value: 10)
  }
}