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3809 interview questionsfor developers (2025)

Test your developer skills before an interview with 3809 corrected questions on 80+ topics. Beginner, Intermediate or Expert level.

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3809 questions
Medium
95 votes3714 runs5 comments

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

Web developer
Vincent Cotroat Jan 18, 2024
Easy
44 votes2956 runs0 comment

Write a SQL query to retrieve the list of employees with a salary greater than 5100.

Back-end developer
sql
select
where
Vincent Cotroat Mar 30, 2023
Medium
40 votes3404 runs4 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
33 votes1748 runs1 comment

Write a Python function that returns the factorial of a number.

Back-end developer
recursion
Vincent Cotroat Mar 28, 2023
Easy
30 votes5788 runs
1 comment

Write the non-JSX equivalent of the following code:

Web developer
react
jsx
Victor Sabatierat Jan 4, 2022
Easy
30 votes1859 runs1 comment

Explain the difference between the `include` and `require` functions in PHP.

Back-end developer
functions
errors
Vincent Cotroat Mar 24, 2023
Easy
29 votes3485 runs2 comments

Create a form with two mandatory fields in Angular

Web developer
angular
form
validation
Anonymous authorat Jan 4, 2022
Easy
27 votes2719 runs
12 comments

Write a Java program that prints 'welovedev'.

Full stack developer
strings
variables
Pierreat Sep 19, 2022
Easy
25 votes5773 runs1 comment

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

Web developer
props
list
Victor Sabatierat Jan 4, 2022
Easy
24 votes3525 runs
2 comments

Fix the following Javascript loop:

Web developer
loops
conditions
Camilleat Apr 27, 2023
Hard
21 votes2123 runs0 comment

Write a Python function that prints the elements of a list.

Back-end developer
list
for loop
Théoat Mar 28, 2022
Easy
21 votes1730 runs1 comment

What is TypeScript?

Web developer
typescript
javascript
angular
Léoat Mar 29, 2022
Easy
20 votes644 runs1 comment

What is the purpose of the Laravel Sanctum tool?

Web developer
laravel
authentication
Damienat Sep 6, 2023
Easy
19 votes2911 runs0 comment

Select only distinct values in a column using SQL

Back-end developer
sql
distinct
Vincent Cotroat Mar 27, 2023
Easy
18 votes2035 runs0 comment

List the different build modes in Flutter

Mobile developer
build
modes
Clément Devos (W3D Team)at Jan 4, 2022
Medium
18 votes1298 runs0 comment

How to handle missing data in a given training data set ?

Data Scientist
machine learning
missing data
Martinat Apr 4, 2022
Easy
17 votes2929 runs0 comment

Write a SQL query to insert data into a table

Back-end developer
sql
insert
Vincent Cotroat Mar 27, 2023
Medium
16 votes5920 runs
2 comments

Write a React component as a function

Web developer
react
functions
state
Clément Devosat Jan 4, 2022
Easy
16 votes4535 runs
2 comments

Call a function on the first render of a React component

Web developer
react
hooks
Clément Devosat Jan 4, 2022
Easy
16 votes3448 runs
3 comments

Which provider is recommended for DOM manipulation in Angular?

Web developer
angular
dom
Anonymous authorat Jan 4, 2022