Swift a failable initializer, will fails if any of those params would nil

gistfile1.txt

struct User {
  let id: Int
  let name: String
  let username: String
  init?(dictionary: Dictionary<String: Any>) {
    guard 
      let id = dictionary[“id”] as? Int,
      let name = dictionary[“name”] as? String,
      let username = dictionary[“username”] as? String
    else {
      return nil
    }
    self.id = id
    self.name = name
    self.username = username
  }
}