flutter broadcast stream example

Example 1: dart StreamController broadcast()

var controller= StreamController.broadcast();
controller.stream.listen(print); 
controller.sink.add(1); // will print 1

Example 2: streams flutter

void messagesStream()async{
     await for( var snapshot in _firestore.collection('messages').snapshots()){
       for (var message in snapshot.documents) {
      print(message.data);
    };
  }
  //can be used for chat app