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330 interview questionsfor Mobile developer (2023)

Test your technical skills before an interview of Mobile developer with 330 corrected questions. Beginner, Intermediate or Expert level.

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330 questions
Easy
8 votes1266 runs0 comment

List the different build modes in Flutter

Mobile developer
Flutter
build
modes
Clément Devos (W3D Team)at Jan 4, 2022
Hard
4 votes444 runs0 comment

Write a React Native animation that spins an image.

Mobile developer
React Native
animation
component
Victor Sabatierat Dec 2, 2021
Expert
3 votes570 runs0 comment

How to flatten a list of lists in Kotlin

Mobile developer
Kotlin
list
map
Anonymous authorat Jan 18, 2022
Easy
3 votes337 runs2 comments

What is the purpose of a RecyclerView in Android?

Mobile developer
Android
list
adapter
Nicolas Laurentat Nov 29, 2021
Hard
2 votes342 runs0 comment

How to check if a variable is defined in Swift

Mobile developer
Swift
optionals
Jorge Gomesat Nov 27, 2021
Expert
2 votes310 runs0 comment

In the onStop() method. I am sure that this callback will always be called and it is likely to be returned only a few times.

Mobile developer
Android
callback
Nicolas Laurentat Dec 2, 2021
Medium
1 vote1300 runs1 comment

What is Dash?

Mobile developer
Flutter
dart
Clément Devos (W3D Team)at Jan 4, 2022
Easy
1 vote1216 runs0 comment

Explain the difference between a Hot Restart and a Hot Reload in Flutter.

Mobile developer
Flutter
hot reload
hot restart
Clément Devos (W3D Team)at Jan 4, 2022
Easy
1 vote1123 runs0 comment

What is the `??=` operator for in Flutter?

Mobile developer
Flutter
operators
null
Clément Devos (W3D Team)at Jan 4, 2022
Expert
1 vote1103 runs0 comment

What are Dart Isolates?

Mobile developer
Flutter
dart
isolates
Clément Devos (W3D Team)at Jan 4, 2022
Hard
1 vote1097 runs0 comment

What is overflow in Flutter?

Mobile developer
Flutter
widgets
Clément Devos (W3D Team)at Jan 4, 2022
Hard
1 vote840 runs0 comment

What does the deferred keyword do in Dart?

Mobile developer
Flutter
dart
imports
Clément Devos (W3D Team)at Jan 4, 2022
Medium
1 vote533 runs1 comment

Write a function that returns the maximum of two integers in Kotlin

Mobile developer
Kotlin
functions
Anonymous authorat Jan 18, 2022
Easy
1 vote470 runs0 comment

What is the output of the following code? const App = () => { const [count, setCount] = useState(0); return ({ <Text> The count is {count} </Text> <Button onPress={() => setCount(count + 1)}> Increase </Button> }); }; export default App;

Mobile developer
React Native
state
Victor Sabatierat Dec 2, 2021
Expert
1 vote467 runs0 comment

What are Semantics in Flutter?

Mobile developer
Flutter
widgets
Clément Devos (W3D Team)at Jan 4, 2022
Hard
1 vote437 runs1 comment

How to add a new element to a list of Kotlin data class

Mobile developer
Kotlin
data class
inheritance
Anonymous authorat Jan 18, 2022
Hard
1 vote382 runs0 comment

Which of the following code snippets will print 'Hello World' to the console?

Mobile developer
React Native
state
Victor Sabatierat Dec 2, 2021
Expert
1 vote370 runs0 comment

I can launch the debugger in Chrome from my app, I run `react-native log-ios` from my command line

Mobile developer
React Native
debugging
Victor Sabatierat Dec 2, 2021
Hard
1 vote340 runs0 comment

What is the name of the Android runtime?

Mobile developer
Android
art
Nicolas Laurentat Dec 2, 2021
Medium
1 vote339 runs1 comment

Which of the following snippets are valid JSX?

Mobile developer
React Native
react
jsx
Romainat Jan 7, 2022
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