garsdle

class Helper { /* I do helpful things */ }

class MainClass {
  let helper: Helper
  
  init(helper: Helper) {
    self.helper = helper
  }
}

garsdle

protocol Helper { }

class BestHelper: Helper { /* I do the best helping in accordance to Helper */ }
class MockHelper: Helper { /* Fake it till you make it  */ }

class MainClass {
  let helper: Helper
  
  init(helper: Helper) {
    self.helper = helper

garsdle

struct User {
  let id: Int
  let name: String
  
  init?(dictionary: [String: Any]) {
    guard let id = dictionary["id"] as? Int else { return nil }
    guard let name = dictionary["user_name"] as? String else { return nil }
    
    self.id = id
    self.name = name

garsdle

struct User: Codable {
  let id: Int
  let name: String
  
  enum CodingKeys: String, CodingKey {
    case id
    case name = "user_name"
  }
}

garsdle

struct User {
  let id: Int
  let name: String
}

class UserMapper {
  func map(_ dictionary: [String: Any]) -> User? {
    guard let id = dictionary["id"] as? Int else { return nil }
    guard let name = dictionary["user_name"] as? String else { return nil }
    

garsdle

func testJSONToUser() {
  let userDictionary = mockUserAPI.getUserDictionary()
  
  guard let user = UserMapper().map(userDictionary) else {
    XCTFail("Failed to map User")
    return
  }
  
  XCTAssert(user.id == 11235)
  XCTAssert(user.name == "BobEsponja")

garsdle

enum DeepLink {
  case post(id: String, commentId: String?)
  case user(username: String)
  
  static func map(url: URL) -> DeepLink? {
    var deepLink: DeepLink?
    var componentsIterator = url.pathComponents.makeIterator()
    
    _ = componentsIterator.next() //url components usually start with a slash so we just ignore
    guard let firstComponent = componentsIterator.next() else { return nil }

garsdle

struct AvatarView: View {
    var image: UIImage?
    var initials: String?
    
    var body: some View {
        OptionalView(image) { image in
            Image(uiImage: image)
        }
        .fallbackView(initials) { initials in
            Text(initials)

garsdle

struct OptionalView<Value, Content>: View where Content: View {
    var content: (Value) -> Content
    var value: Value
    
    init?(_ value: Value?, @ViewBuilder content: @escaping (Value) -> Content) {
        guard let value = value else {
            return nil
        }
        self.value = value
        self.content = content

garsdle

struct ContentView: View {
    
    @State var showNewCardView = false
    
    @State var mirleftCards: [MirleftCard] = [
        MirleftCard(image: Image("beach"), title: "The Beach", description: "The amazing view of the Grande Plage."),
        MirleftCard(image: Image("sunset"), title: "Sunset", description: "The beautiful moroccan sunset."),
    ]
    
    var body: some View {