struct UserProfile {}
func getProfile(token: String) -> Promise<UserProfile>
func login(username: String, password: String) -> Promise<String>

login(username: "alfianlosari", password: "123456")
  .then { getProfile(token: $0 ) }
  .then { print("Profile Retrieved: \($0)") }
  .catch { print("Error: \($0)")
}