React Native Interview Questions

JavaScript Questions ✅

1. What are the different data types present in javascript?

2. Explain Hoisting in javascript.

3. Why do we use the word “debugger” in javascript?

4. Difference between “ == “ and “ === “ operators.

5. Difference between var , let and const keyword in javascript.

6. What is NaN property in JavaScript?

7. Explain Higher Order Functions in javascript.

8. Explain “this” keyword.

9. What are callbacks?

10.  What is Object Destructuring?

11. What is the rest parameter and spread operator?

12. What are arrow functions?

13. What are the types of errors in javascript?

14. What is memoization?

15. What is recursion in a programming language?

16. What is the use of a constructor function in javascript?

17. What is the use of promises in javascript?

18. What are generator functions?

19. What has to be done in order to put Lexical Scoping into practice?

20. Explain call(), apply() and, bind() methods.

21. Explain Closures in JavaScript.

22. What are featured added in ES6 ?

React Questions ✅

1. What is React?

2. What are the advantages of using React?

3. What is useState() in React?

4. What is JSX?

5. What are the differences between functional and class components?

6. What is the virtual DOM? How does react use the virtual DOM to render the UI?

7. What are the differences between controlled and uncontrolled components?

8. What are props in React?

9. Explain about types of side effects in React component.

10. What is prop drilling in React?

11. What are error boundaries?

12. What is React Hooks?

13. What is the use of useEffect React Hooks?

14. What are Custom Hooks?

15. How to prevent re-renders in React?

16. Name a few techniques to optimize React app performance.

17. How to pass data between react components?

18. What are Higher Order Components?

19. What are the different phases of the component lifecycle?

20. What are the lifecycle methods of React?

21. Explain about types of Hooks in React.

22. How does the performance of using Hooks will differ in comparison with the classes?

23. Do Hooks cover all the functionalities provided by the classes?

24. What is React Router?

25. Can React Hook replaces Redux?

React Native Questions ✅

1. How Different is React-native from ReactJS ?

2. What is Flexbox and describe any elaborate on its most used properties?

3. Describe advantages of using React Native?

4. What are threads in General ? and explain Different Threads in ReactNative with Use of Each ?

5. Are default props available in React Native and if yes for what are they used and how are they used ?

6. What is State and how is it used in React Native?

7. What is Redux in React Native and give important components of Redux used in React Native app ?

8. Describe Timers in React Native Application ?

9. How to debug React Native Applications and Name the Tools used for it ?

10. What is Props Drilling and how can we avoid it ?

11. Describing Networking in React Native and how to make AJAX network calls in React Native?

12. What is a bridge and why is it used in React Native ? Explain for both android and IOS ?

13. Name core Components in React Native and the analogy of those components when compared with the web .

14. What is ListView and describe its use in React Native ?

15. How can you write different code for IOS and Android in the same code base ? Is there any module available for this ?

16. Explain FlatList components, what are its key features along with a code sample ?

17. How To Use Routing with React Navigation in React Native ?

18. What are the Different Ways to style React Native Application ?

19. List down some of the steps to optimize the application.

20. Describe Memory leak Issue in React Native , how can it be detected and resolved ?

21. Is there any out of the box way storing sensitive data in React ? If yes which and if not how can this be achieved ?

22. What is Network Security and SSL Pinning?

23. Explain setNativeProps. Does it create Performance issues and how is it used ?

 React Native Topics To Learn ✅

1- React Native Responsive UI

2- Axios and Fetch

3- React Native Flex

4- Flatlist

5- React Navigation

6- React Redux

7- React Native Firebase (Push Notification + Database)

8- React Native Maps

9- React Native Local Database (AsyncStorage,Mysqlite -60% Chances) 

10- React Native Media (Audio,Video)

11- React Native SVG

12- React Native GIf

13- React Native Data Loading 

14- React Native Graphs

15- React Native Webview

16- React Native Payment gateway

17- React Native Testing

18- React Native Build creation in android & iOS both

19- React Native Modal

20- React Native Bottom Sheet

21- React Native Image Picker  + Camera 

22 – React Native (Native Modules)

23- React Native Bridge

24 – React Native Material UI

25- React Native Lottie

26- React Native Infinite Data Loading on Scroll

27 – React Native Animations (Animated+ Reanimated + Moti)

28- React Native Back handler 

29- React Native Permissions

30 – React Native  Graphql

31- React Native Bottom Navigation

32 – React Native Side Navigation

33- React Native Local Data Filter