Job offersCompaniesTestsBlogI'm an employerSign upLog in
fr
fr
Home>IT Tests>Questions>React (legacy)

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.

or
Technology
Profession
Test
Sort by
Newest
Most popular
Last review
Filter by
Published
3868
To review
5
17 questions
Hard
7 votes1562 runs0 comment

How to submit a form in React

Web developer
form
submit
Victor Sabatierat Feb 3, 2022
Hard
7 votes1535 runs0 comment

Optimize a React component by implementing shouldComponentUpdate

Web developer
react
array
shouldComponentUpdate
Clément Devosat Feb 3, 2022
Easy
7 votes1522 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 votes1538 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 votes1562 runs0 comment

Fix the following React component: Scroller

Web developer
react
event
performance
Victor Sabatierat Feb 3, 2022
Easy
3 votes1599 runs0 comment

Write a React component as a function

Web developer
react
functions
state
Clément Devosat Feb 3, 2022
Hard
3 votes1577 runs0 comment

Optimize the following React component:

Web developer
react
components
Victor Sabatierat Feb 3, 2022
Easy
3 votes1565 runs0 comment

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

Web developer
state
react
Clément Devosat Feb 3, 2022
Easy
3 votes1531 runs0 comment

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

Web developer
props
list
Victor Sabatierat Feb 3, 2022
Hard
2 votes1551 runs0 comment

Fix the following React component:

Web developer
react
state
constructor
Clément Devosat Feb 3, 2022
Medium
2 votes1550 runs0 comment

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

Web developer
react
lifecycle
Victor Sabatierat Feb 3, 2022
Medium
1 vote1570 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 vote1551 runs0 comment

Find the problem(s) in this React code:

Web developer
react
props
return
Victor Sabatierat Feb 3, 2022
Hard
1 vote1524 runs0 comment

Optimize the display of a React component.

Web developer
react
component
optimization
Clément Devosat Feb 3, 2022
Hard
1 vote1523 runs
1 comment

What does this React component display?

Web developer
react
state
async
Clément Devosat Feb 3, 2022
Hard
0 vote1596 runs2 comments

Render a text in a red background in React

Web developer
react
dom
render
Clément Devosat Feb 3, 2022
Easy
0 vote388 runs
2 comments

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

Web developer
react
render
josueat Sep 5, 2023