kwalrath

myReduxStore.onChange
    .map((s) => MyViewModel(s))
    .distinct()
    .listen( /* update UI */ );

kwalrath

StreamBuilder<String>(
  stream: NumberCreator().stream.map((i) => 'String $i'),
  builder: (context, snapshot) {
    if (snapshot.connectionState == ConnectionState.waiting) {
      return Text('No data yet.');
    } else if (snapshot.connectionState == ConnectionState.done) {
      return Text('Done!');
    }
  }
)

kwalrath

StreamBuilder<String>(
  stream: NumberCreator().stream.map((i) => 'String $i'),
  builder: (context, snapshot) {
    /* Build widgets! */
  }
)

kwalrath

class NumberCreator {
  NumberCreator() {
    Timer.periodic(Duration(seconds: 1), (t) {
      _controller.sink.add(_count);
      _count++;
    });
  }

  var _count = 1;
  final _controller = StreamController<int>();

kwalrath

final myStream = NumberCreator().stream.asBroadcastStream();

final subscription = myStream.listen(
  (data) => print('Data: $data'),
);

final subscription2 = myStream.listen(
  (data) => print('Data again: $data'),
);

kwalrath

final myStream = NumberCreator().stream;

final subscription = myStream.listen(
  (data) => print('Data: $data'),
);

kwalrath

// Add a contravariant variance modifier
class Writer<in T> {  
  void write(T x) => print(x);
}

main() {
  // Error! Cannot assign Writer<int> to Writer<Object> because the type
  // parameter is contravariantly declared.
  Writer<Object> objectWriter = new Writer<int>(); 
}

kwalrath

void main() {
  var iterable = ['Salad', 'Popcorn', 'Toast'];
  for (var element in iterable) {
    print(element);
  }
}

kwalrath

void main() {
  Iterable iterable = ['Salad', 'Popcorn', 'Toast'];
  print('The first element is ${iterable.first}');
  print('The last element is ${iterable.last}');
}

kwalrath

bool predicate(String element) {
  return element.length > 5;
}

main() {
  var items = ['Salad', 'Popcorn', 'Toast', 'Lasagne'];

  // You can find with a simple expression:
  var element1 = items.firstWhere((element) => element.length > 5);
  print(element1);