const Selectors in Riverpod / BlocStop passing entire state objects into your
build methods. When dealing with complex state, observing the full object triggers rebuilds on every field change, even ones your sub-widget doesn't care about.❌ Bad Approach (Triggers rebuild on any
UserState change):Dart
// Rebuilds even if only user.email changes!
final name = ref.watch(userProvider).name;
return Text(name);
✅ Pro Approach (Rebuilds ONLY when
name changes):Dart
// Selects only the specific value
final name = ref.watch(userProvider.select((u) => u.name));
return Text(name);
💡 Why it matters:
✅
select() acts as an internal comparator memoizing state properties.✅ Reduces frame drops (jank) in heavy tree structures, especially during high-frequency stream updates or background syncs.
@FlutterBegin.
