What is BLoC in Flutter?

 

BLoC (Business Logic Component) separates the UI from business logic using Streams.

• Input: Events (via Sink)

• Output: States (via Stream)

Example:

class CounterBloc {
  final _countController = StreamController<int>();
  int _count = 0;

  Stream<int> get countStream => _countController.stream;

  void increment() {
    _count++;
    _countController.sink.add(_count);
  }

  void dispose() {
    _countController.close();
  }
}

Advantages:

• Clean architecture

• Reusable and testable code