fizz buzz with Stream (Asynchronous Programming in Dart)

main.dart

Stream<String> fizzBuzz(int n) async* {
  for (var i = 1; i <= n; i++) {
    // await Future.delayed(Duration(milliseconds: 500));
    if (i % 3 == 0 && i % 5 == 0) {
      yield 'fizz buzz';
    } else if (i % 3 == 0) {
      yield 'fizz';
    } else if (i % 5 == 0) {
      yield 'buzz';
    } else {
      yield '$i';
    }
  }
}
 
Future<void> main() async {
  final fizzbuzz = await fizzBuzz(15);
  await for (var i in fizzbuzz) {
    await Future.delayed(Duration(milliseconds: 500));
    print(i);
  }
}

output

1
2
fizz
4
buzz
fizz
7
8
fizz
buzz
11
fizz
13
14
fizz buzz

It waits 500 ms for each line.