Dependency injection (GetIt) in Flutter - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to register a singleton instance using GetIt.

Flutter

final getIt = GetIt.instance;

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

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

AregisterLazySingleton

BregisterFactory

CregisterSingleton

DregisterInstance

Attempts:

3 left

💡 Hint

Common Mistakes

Using registerFactory instead of registerSingleton

Confusing lazy singleton with immediate singleton

The registerSingleton method registers a singleton instance immediately.

2fill in blank

medium

Complete the code to retrieve the registered service instance from GetIt.

Flutter

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

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Aget

Bfetch

Cfind

Dretrieve

Attempts:

3 left

💡 Hint

Common Mistakes

Using find or fetch which are not GetIt methods

Trying to access the instance directly without get()

The get method is used to retrieve the registered instance from GetIt.

3fill in blank

hard

Fix the error in this code to register a lazy singleton with GetIt.

Flutter

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

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

AregisterLazySingleton

BregisterFactory

CregisterSingleton

DregisterInstance

Attempts:

3 left

💡 Hint

Common Mistakes

Using registerSingleton which creates instance immediately

Using registerFactory which creates new instance every time

The registerLazySingleton method registers the instance lazily, creating it only when needed.

4fill in blank

hard

Fill both blanks to register and then retrieve a service instance using GetIt.

Flutter

getIt.[1]<MyService>(MyService());
final service = getIt.[2]<MyService>();

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

AregisterSingleton

Bget

CregisterFactory

Dfind

Attempts:

3 left

💡 Hint

Common Mistakes

Using registerFactory instead of registerSingleton for single instance

Using find instead of get to retrieve instance

First, register the singleton with registerSingleton. Then retrieve it with get.

5fill in blank

hard

Fill all three blanks to register a lazy singleton, retrieve it, and call a method.

Flutter

getIt.[1]<MyService>(() => MyService());
final service = getIt.[2]<MyService>();
service.[3]();

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

AregisterLazySingleton

Bget

Cinitialize

DregisterSingleton

Attempts:

3 left

💡 Hint

Common Mistakes

Using registerSingleton instead of lazy singleton

Calling a method that does not exist on the service

Register lazily with registerLazySingleton, get the instance with get, then call initialize() method.