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840 interview questionsfor Front-end developer (2024)

Test your technical skills before an interview of Front-end developer with 840 corrected questions. Beginner, Intermediate or Expert level.

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840 questions
Medium
65 votes2823 runs4 comments

Understanding the differences between `map()` and `forEach()` methods in JavaScript

Web developer
Vincent Cotroat Jan 18, 2024
Easy
29 votes2592 runs3 comments

Write a JavaScript function that fetches data from an API and logs it to the console.

Web developer
promises
async
Vincent Cotroat Mar 28, 2023
Easy
26 votes5178 runs0 comment

Write the non-JSX equivalent of the following code:

Web developer
react
jsx
Victor Sabatierat Jan 4, 2022
Easy
26 votes3068 runs2 comments

Create a form with two mandatory fields in Angular

Web developer
angular
form
validation
Anonymous authorat Jan 4, 2022
Easy
20 votes5183 runs1 comment

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

Web developer
props
list
Victor Sabatierat Jan 4, 2022
Easy
19 votes2747 runs1 comment

Fix the following Javascript loop:

Web developer
loops
conditions
Camilleat Apr 27, 2023
Easy
16 votes1391 runs1 comment

What is TypeScript?

Web developer
typescript
javascript
angular
Léoat Mar 29, 2022
Medium
13 votes5269 runs0 comment

Write a React component as a function

Web developer
react
functions
state
Clément Devosat Jan 4, 2022
Medium
13 votes2996 runs
3 comments

Which of these methods, allowing to create Providers, does not exist in Angular?

Web developer
angular
providers
Anonymous authorat Mar 28, 2023
Easy
12 votes3966 runs1 comment

Call a function on the first render of a React component

Web developer
react
hooks
Clément Devosat Jan 4, 2022
Easy
12 votes3032 runs2 comments

Which provider is recommended for DOM manipulation in Angular?

Web developer
angular
dom
Anonymous authorat Jan 4, 2022
Easy
10 votes5229 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
10 votes3256 runs
3 comments

The certificate variable is not attainable outside the if loop

Web developer
variables
scope
Kahinaat Apr 6, 2022
Easy
10 votes1290 runs
3 comments

Specify the location in the DOM where the component of the active route will be inserted in Angular

Web developer
angular
router
Léoat Mar 29, 2022
Easy
9 votes3464 runs1 comment

UseState and useEffect in React

Web developer
state
useState
useEffect
Vincent Cotroat Jan 4, 2022
Easy
9 votes3092 runs2 comments

Use spread operator to split an array into two arrays in Javascript

Web developer
array
spread operator
Kahinaat Jul 19, 2024
Easy
8 votes2973 runs0 comment

Write a React component that displays the sum of two numbers

Web developer
react
components
state
Vincent Cotroat Jan 4, 2022
Medium
8 votes2890 runs2 comments

Write a pipe to format a date according to a certain pattern.

Web developer
angular
pipe
Anonymous authorat Jan 4, 2022
Hard
8 votes2093 runs1 comment

Which of the following equality(s) are true? 0 == '', 'f' + 1 == 'f1'

Front-end developer
javascript
equality
Jean-marie Cléryat Jan 4, 2022
Hard
8 votes1683 runs1 comment

What are the two methods that can be used to send data to a server in HTML5?

Web developer
html5
http
Jean-marie Cléryat Dec 1, 2021
Front-end developer tests