Enum with String and Int

enum Group: String {
  case Me
  case You
  case Her
  case Him
  
  init?(index: Int) {
    switch index {
    case 0: self = .Me
    case 1: self = .You
    case 2: self = .Her
    case 3: self = .Him
    default: return nil
    }
  }
}

print(Group(index: 0)?.rawValue) // Optional("Me")