final String baseUrl = dotenv.env['BASE_URL'] ?? 'default_url'; final String apiKey = dotenv.env['API_KEY'] ?? 'default_key'; Here in null check why default URL and key we are hiding it from outside world?

amazing article

Hi, I have a doubt about why you use Future.wait(userFutures), instead, we can await the future in the above line userFutures=await userIds.map((id) => getUserData(id));

that's what I want to say to new upcoming web developers