dart_generator.dart

dart_generator.dart

import 'dart:async';

main() async {
  print(naturalsTo(10).toList());
  print(await asynchronousNaturalsTo(10).toList());
  print(naturalsDownFrom(10).toList());
  print(await periodicGenerator(10).toList());
}

Iterable<int> naturalsTo(int n) sync* {
  int k = 0;
  while (k < n) yield k++;
}

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


Iterable<int> naturalsDownFrom(int n) sync* {
  if (n > 0) {
    yield n;
    yield* naturalsDownFrom(n - 1);
  }
}


Stream<int> periodicGenerator(int n) async* {
  yield* Stream.periodic(Duration(seconds: 1), (value) => value).take(n);
}