in tutorials/tutorial4-completed/TicTacToe/LoggedIn/LoggedInInteractor.swift [69:79]
func launchGame(with id: String?) -> Observable<(LoggedInActionableItem, ())> {
let game: Game? = games.first { game in
return game.id.lowercased() == id?.lowercased()
}
if let game = game {
router?.routeToGame(with: game.builder)
}
return Observable.just((self, ()))
}