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17 interview questions on React (legacy)for developers (2026)

Test your technical skills before an interview of React (legacy) with 17 corrected questions. Beginner, Intermediate or Expert level.

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Hard
7 votes1574 runs0 comment

How to submit a form in React

Web developer
form
submit
Victor Sabatierat Feb 3, 2022
Hard
7 votes1544 runs0 comment

Optimize a React component by implementing shouldComponentUpdate

Web developer
react
array
shouldComponentUpdate
Clément Devosat Feb 3, 2022
Easy
7 votes1532 runs0 comment

Improve this React component so that it displays "Green" by default.

Web developer
react
state
component
Victor Sabatierat Feb 3, 2022
Hard
6 votes1547 runs0 comment

Write a React function that fetches comments and passes them to a component.

Web developer
react
components
Victor Sabatierat Feb 3, 2022
Medium
4 votes1571 runs0 comment

Fix the following React component: Scroller

Web developer
react
event
performance
Victor Sabatierat Feb 3, 2022
Easy
4 votes1541 runs0 comment

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

Web developer
props
list
Victor Sabatierat Feb 3, 2022
Easy
3 votes1609 runs0 comment

Write a React component as a function

Web developer
react
functions
state
Clément Devosat Feb 3, 2022
Hard
3 votes1586 runs0 comment

Optimize the following React component:

Web developer
react
components
Victor Sabatierat Feb 3, 2022
Easy
3 votes1575 runs0 comment

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

Web developer
state
react
Clément Devosat Feb 3, 2022
Hard
2 votes1560 runs0 comment

Fix the following React component:

Web developer
react
state
constructor
Clément Devosat Feb 3, 2022
Medium
2 votes1560 runs0 comment

Which lifecycle methods are called when rendering on the server side?

Web developer
react
lifecycle
Victor Sabatierat Feb 3, 2022
Medium
1 vote1581 runs1 comment

Write a React component that displays the hexadecimal CSS color code of certain colors.

Web developer
react
state
component
Victor Sabatierat Feb 3, 2022
Hard
1 vote1562 runs0 comment

Find the problem(s) in this React code:

Web developer
react
props
return
Victor Sabatierat Feb 3, 2022
Hard
1 vote1535 runs0 comment

Optimize the display of a React component.

Web developer
react
component
optimization
Clément Devosat Feb 3, 2022
Hard
1 vote1534 runs
1 comment

What does this React component display?

Web developer
react
state
async
Clément Devosat Feb 3, 2022
Hard
0 vote1606 runs2 comments

Render a text in a red background in React

Web developer
react
dom
render
Clément Devosat Feb 3, 2022
Easy
0 vote407 runs
2 comments

What is wrong with this React code? ```javascript React.render( <MyApp/> , document.body ); ```

Web developer
react
render
Josuéat Sep 5, 2023