How to do it...

In this recipe, you will see the advantages of using the async/await pattern: 

1. Add the following three methods to the main.dart file, at the bottom of the _FuturePageState class:

  Future<int> returnOneAsync() async {
    await Future<int>.delayed(const Duration(seconds: 3));
    return 1;
  }

  Future<int> returnTwoAsync() async {
    await Future<int>.delayed(const Duration(seconds: 3));
    return 2;
  }

  Future<int> returnThreeAsync() async {
    await Future<int>.delayed(const Duration(seconds: 3));
    return 3;
  }

2. Under the three methods you just created, add the count() method leveraging the async/await pattern:

Future count() async {
    int total = 0;
    total = await returnOneAsync();
    total += await returnTwoAsync();
    total += await returnThreeAsync();
    setState(() {
      result = total.toString();
    });
  }

3. Call the count() method from the onPressed function of the "GO" button: