Junior — Middle

Have you worked with the MVVM architectural pattern in reactive applications?

sobes.tech AI

Answer from AI

Yes, in reactive Flutter applications, the MVVM (Model-View-ViewModel) pattern is often used to separate presentation logic from business logic. The ViewModel contains reactive data streams (for example, using Stream or ValueNotifier), which the View subscribes to and updates the UI upon changes. This makes state management easier and simplifies testing.

An example of a simple ViewModel using ValueNotifier:

class CounterViewModel {
  final ValueNotifier<int> counter = ValueNotifier<int>(0);

  void increment() {
    counter.value++;
  }
}

// In a Flutter widget:
// ValueListenableBuilder<int>(
//   valueListenable: viewModel.counter,
//   builder: (context, value, child) {
//     return Text('Counter: $value');
//   },
// )

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