Async Generators example

async-gen.dart

import 'dart:async';

void main() {
//   asynchronousNaturalsTo(10).listen(print);
  final controller = asyncNaturalsTo(10);
  
  controller.stream.listen((n) => print('YEss $n'),
                            onDone: () {
                              controller.close();
                            });
}

Stream<int> asynchronousNaturalsTo(int n) async* {
  int k = 0;
  while (k < n) yield k++;
}

StreamController<int> asyncNaturalsTo(int n) {
  final controller = StreamController<int>();
  
  int k = 0;
  while (k < n) {
    controller.add(k);
    k++;
  }
  
  return controller;
}