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

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

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
  
  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

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

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

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