Applying Protocol-Oriented Programming in Development
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Demo
Head back to the playground in Xcode. First, define a new protocol called RandomEntertainmentPicker to help you pick what to do this evening:
protocol RandomEntertainmentPicker {
associatedtype Item
func getItemToEnjoy() -> Item?
}
struct MediaShelf<T: MediaItem>: MediaCollection, RandomEntertainmentPicker {
var items: [T] = []
func getItemToEnjoy() -> T? {
items.randomElement()
}
}
print("Let's play \(videoGameShelf.getItemToEnjoy()?.title ?? "Nothing!")")
func printItemDetails(_ item: MediaItem & Codable) throws {
let jsonEncoder = JSONEncoder()
let data = try jsonEncoder.encode(item)
if let string = String(data: data, encoding: .utf8) {
print(string)
}
}
try printItemDetails(catan)
try printItemDetails(noTimeToDie)
struct CardGames: RandomEntertainmentPicker {
let games: [CardGame]
func getItemToEnjoy() -> CardGame? {
return games.randomElement()
}
}
let bridge = CardGame(title: "Bridge")
let solitaire = CardGame(title: "Solitaire")
let cardGames = CardGames(games: [bridge, solitaire])
guard let cardGameToPlay = cardGames.getItemToEnjoy() else {
fatalError("We have no card games!")
}
print("We have some cards so we'll play \(cardGameToPlay.title)")