Service locator pattern in Flutter - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to register a service using the service locator.

Flutter

final getIt = GetIt.instance;

void setup() {
  getIt.[1]<MyService>(MyServiceImpl());
}

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

AregisterFactory

BregisterSingleton

CregisterLazySingleton

DregisterInstance

Attempts:

3 left

💡 Hint

Common Mistakes

Using registerFactory instead of registerSingleton causes a new instance every time.

Using registerLazySingleton delays creation until first use, not immediate.

The registerSingleton method registers a single instance of the service immediately.

2fill in blank

medium

Complete the code to retrieve the registered service from the service locator.

Flutter

final myService = getIt.[1]<MyService>();

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

Aget

Bfind

Cfetch

Dlocate

Attempts:

3 left

💡 Hint

Common Mistakes

Using find or fetch causes errors because those methods do not exist.

Using locate is not a method in GetIt.

The get method retrieves the registered service instance.

3fill in blank

hard

Fix the error in the code to register a lazy singleton service.

Flutter

getIt.[1]<MyService>(() => MyServiceImpl());

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

AregisterSingleton

BregisterFactory

CregisterLazySingleton

DregisterInstance

Attempts:

3 left

💡 Hint

Common Mistakes

Using registerSingleton creates the instance immediately, not lazily.

Using registerFactory creates a new instance every time, not singleton.

The registerLazySingleton method registers a service that is created only when first requested.

4fill in blank

hard

Fill both blanks to register and retrieve a service correctly.

Flutter

getIt.[1]<Logger>(() => LoggerImpl());
final logger = getIt.[2]<Logger>();

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

AregisterLazySingleton

Bget

CregisterSingleton

Dfind

Attempts:

3 left

💡 Hint

Common Mistakes

Using registerSingleton instead of lazy singleton changes when instance is created.

Using find instead of get causes runtime errors.

Use registerLazySingleton to register lazily and get to retrieve the service.

5fill in blank

hard

Fill all three blanks to register a factory, retrieve the service, and reset the locator.

Flutter

getIt.[1]<ApiService>(() => ApiServiceImpl());
final api = getIt.[2]<ApiService>();
await getIt.[3]();

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

AregisterFactory

Bget

Creset

DregisterSingleton

Attempts:

3 left

💡 Hint

Common Mistakes

Using registerSingleton instead of registerFactory changes instance creation behavior.

Forgetting to await reset causes unexpected behavior.

registerFactory registers a factory for new instances, get retrieves, and reset clears all registrations.