gistfile1.txt

// Protocol oriented design example

protocol Endpoint {
  var method: String { get }
  var path: String { get }
  var body: [String: AnyObject] { get }
}

func request(endpoint: Endpoint) {
  APIClient.request(endpoint.path, method: endpoint.method);
}

struct GithubEndpoint: Endpoint {
  var method: String {
    return "GET"
  }

  var path: String {
    return "/users"
  }

  var body: [String: AnyObject] {
    return [:]
  }
}


let endpoint = GithubEndpoin()

request(endpoint)

// Optionals

func createPerson(name: String, nickname: String?) -> Person {
  return Person(name: name, nickname: nickname!)
}

func createPerson(name: String, nickname: String) -> Person {
  return Person(name: name, nickname: nickname);
}

struct Person {
  let name: String
  let nickname: String!

  init(name: String, nickname: String) {
    self.name = name
    self.nickname = nickname
  }

  init(name: String) {
    self.name = name
  }
}