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39 interview questions on React ⚛️for developers (2024)

Test your technical skills before an interview of React ⚛️ with 39 corrected questions. Beginner, Intermediate or Expert level.

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39 questions
Easy
23 votes4889 runs0 comment

Write the non-JSX equivalent of the following code:

Web developer
react
jsx
Victor Sabatierat Jan 4, 2022
Easy
19 votes4896 runs1 comment

Write the missing code to render the children of the UserProfile component.

Web developer
props
list
Victor Sabatierat Jan 4, 2022
Medium
13 votes4952 runs0 comment

Write a React component as a function

Web developer
react
functions
state
Clément Devosat Jan 4, 2022
Easy
11 votes3701 runs1 comment

Call a function on the first render of a React component

Web developer
react
hooks
Clément Devosat Jan 4, 2022
Easy
9 votes4932 runs1 comment

Save the state used to display the selected page in a React component.

Web developer
state
react
Clément Devosat Nov 7, 2023
Easy
8 votes2726 runs0 comment

Write a React component that displays the sum of two numbers

Web developer
react
components
state
Vincent Cotroat Jan 4, 2022
Easy
7 votes3488 runs0 comment

Which statement(s) are true about hooks?

Web developer
react
hooks
Clément DEVOSat Jan 4, 2022
Easy
7 votes3214 runs
1 comment

UseState and useEffect in React

Web developer
state
useState
useEffect
Vincent Cotroat Jan 4, 2022
Easy
6 votes2463 runs0 comment

How to optimize a React component to improve its performance?

Web developer
react
performance
Clément Devosat Jan 4, 2022
Easy
6 votes1164 runs0 comment

Write a React component that updates the document title with each click and resets to 'React App' when the component unmounts.

Web developer
react
hooks
useState
Vincent Cotroat Apr 5, 2023
Easy
5 votes3671 runs1 comment

Find the issue with this React code:

Web developer
react
useCallback
Clément Devosat Jan 4, 2022
Hard
5 votes3395 runs1 comment

Write a React component that displays the number 2

Web developer
react
state
useState
Vincent Cotroat Jan 4, 2022
Easy
5 votes939 runs2 comments

Use the `useContext` hook to render a button with a dark theme.

Web developer
react
context
hooks
Vincent Cotroat Nov 7, 2023
Medium
4 votes3847 runs3 comments

Fix the useMemo hook in this React component.

Web developer
react
hooks
Clément Devosat Feb 6, 2024
Easy
4 votes3620 runs1 comment

Use useCallback to optimize rendering in React

Web developer
react
usecallback
Clément Devosat Mar 15, 2024
Easy
4 votes752 runs1 comment

Change the style of a button using the `useState` hook in React.

Web developer
react
state
style
Vincent Cotroat Apr 10, 2023
Easy
3 votes504 runs0 comment

Render a list of string from an array in React

Web developer
array
map
Emilieat May 4, 2023
Easy
2 votes2349 runs2 comments

What are the advantages of SSR(server side rendering)?

Web developer
react
ssr
Vincent Cotroat Jan 4, 2022
Easy
2 votes1344 runs0 comment

What is the Concurrent Mode feature introduced in React?

Web developer
react
concurrent mode
Vincent Cotroat Mar 27, 2023
Easy
2 votes1297 runs0 comment

Explain how the `memo` hook works in React

Web developer
react
functional components
Philippeat Mar 9, 2022