SharedPreferences for key-value in Flutter - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the SharedPreferences package.

Flutter

import 'package:[1]/shared_preferences.dart';

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

Ashared_preferences

Bflutter

Cprefs

Dstorage

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect package names like 'flutter' or 'prefs'.

Forgetting to import the package.

The correct package name to import SharedPreferences is shared_preferences.

2fill in blank

medium

Complete the code to get an instance of SharedPreferences asynchronously.

Flutter

final prefs = await SharedPreferences.[1]();

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

Ainstance

BgetInstance

Cinit

Dload

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'instance' or 'init' which do not exist.

Not using await for the asynchronous call.

The method to get SharedPreferences instance is getInstance().

3fill in blank

hard

Fix the error in saving a string value with key 'username'.

Flutter

await prefs.[1]('username', 'Alice');

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

AputString

BsaveString

CsetString

DstoreString

Attempts:

3 left

💡 Hint

Common Mistakes

Using non-existent methods like 'saveString' or 'putString'.

Confusing with other storage APIs.

The correct method to save a string is setString.

4fill in blank

hard

Fill both blanks to read a string value for key 'username' with a default fallback.

Flutter

String username = prefs.[1]('username') ?? [2];

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

AgetString

B'Guest'

C'Anonymous'

Dget

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'get' instead of 'getString'.

Not providing a default value causing null errors.

Use getString to read the string and provide a default like 'Guest' if null.

5fill in blank

hard

Fill all three blanks to remove a key and check if it was removed successfully.

Flutter

bool removed = await prefs.[1]('username');
if (removed) {
  print('[2] was removed');
} else {
  print('[3] not found');
}

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

Aremove

Busername

CKey

DUser

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong method names like 'delete'.

Using incorrect key names in messages.

The method to remove a key is remove. The key name is username. The message uses 'Key' to indicate the key was not found.