State management comparison in Flutter - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a simple StatefulWidget in Flutter.

Flutter

class MyCounter extends StatefulWidget {
  @override
  _MyCounterState createState() => [1]();
}

class _MyCounterState extends State<MyCounter> {
  int count = 0;

  @override
  Widget build(BuildContext context) {
    return Text('Count: $count');
  }
}

Drag options to blanks, or click blank then click option'

AMyCounterState

B_MyCounterState

CStatefulWidget

DState

Attempts:

3 left

💡 Hint

Common Mistakes

Returning the widget class itself instead of the State class.

Using a wrong class name for the State.

The createState method must return an instance of the State class associated with the StatefulWidget. Here, it returns _MyCounterState().

2fill in blank

medium

Complete the code to update the state when a button is pressed.

Flutter

ElevatedButton(
  onPressed: () {
    setState(() {
      count [1] count + 1;
    });
  },
  child: Text('Increment'),
)

Drag options to blanks, or click blank then click option'

A-

B==

C+=

D=

Attempts:

3 left

💡 Hint

Common Mistakes

Using '==' instead of '=' causes no state change.

Using '+=' leads to incorrect logic: count += count + 1.

To update the state variable, use the assignment operator =. The setState method tells Flutter to redraw the widget with the new state.

3fill in blank

hard

Fix the error in the Provider usage to access the counter value.

Flutter

final counter = Provider.of<Counter>(context, [1]: false);

Drag options to blanks, or click blank then click option'

Alisten

Bwatch

Cnotify

Dupdate

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'watch' or 'notify' which are not parameters of Provider.of.

Confusing 'listen' with 'update'.

The Provider.of method uses the listen parameter to decide if the widget should rebuild when the value changes. Setting listen: false means it won't rebuild.

4fill in blank

hard

Fill both blanks to create a Riverpod provider and read its value in a widget.

Flutter

final counterProvider = [1]((ref) => 0);

int count = ref.[2](counterProvider);

Drag options to blanks, or click blank then click option'

AStateProvider

Bread

Cwatch

DProvider

Attempts:

3 left

💡 Hint

Common Mistakes

Using Provider instead of StateProvider for state.

Using watch when only reading once.

StateProvider creates a provider that holds a state. To get the current value without listening for changes, use ref.read.

5fill in blank

hard

Fill in the blanks to complete a Bloc event handler that increments a counter.

Flutter

on<IncrementEvent>((event, emit) {
  emit(state [1] 1);
  print('Counter is now ${{BLANK_3}}');
});

Drag options to blanks, or click blank then click option'

A+

B-

Cstate

Dcount

Attempts:

3 left

💡 Hint

Common Mistakes

Using minus instead of plus.

Using a variable name not defined in the Bloc context.

The Bloc emits a new state by adding 1 to the current state. The print statement shows the updated state value.