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3841 interview questionsfor developers (2026)

Test your developer skills before an interview with 3841 corrected questions on 80+ topics. Beginner, Intermediate or Expert level.

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3841 questions
Hard
113 votes4354 runs
6 comments

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

Web developer
Vincent Cotroat Jan 18, 2024
Medium
49 votes3995 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
49 votes3459 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
Easy
41 votes2106 runs1 comment

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

Back-end developer
recursion
Vincent Cotroat Mar 28, 2023
Easy
39 votes2156 runs1 comment

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

Back-end developer
functions
errors
Vincent Cotroat Mar 24, 2023
Easy
35 votes3099 runs
12 comments

Write a Java program that prints 'welovedev'.

Full stack developer
strings
variables
Pierreat Sep 19, 2022
Easy
34 votes6203 runs
1 comment

Write the non-JSX equivalent of the following code:

Web developer
react
jsx
Victor Sabatierat Jan 4, 2022
Easy
32 votes4090 runs
2 comments

Fix the following Javascript loop:

Web developer
loops
conditions
Anonymous authorat Apr 27, 2023
Easy
30 votes3767 runs2 comments

Create a form with two mandatory fields in Angular

Web developer
angular
form
validation
Anonymous authorat Jan 4, 2022
Easy
27 votes6179 runs1 comment

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

Web developer
props
list
Victor Sabatierat Jan 4, 2022
Hard
25 votes2487 runs
1 comment

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

Back-end developer
list
for loop
Anonymous authorat Mar 28, 2022
Easy
24 votes867 runs1 comment

What is the purpose of the Laravel Sanctum tool?

Web developer
laravel
authentication
Damienat Sep 6, 2023
Easy
23 votes1997 runs1 comment

What is TypeScript?

Web developer
typescript
javascript
angular
Léoat Mar 29, 2022
Easy
19 votes3410 runs0 comment

Select only distinct values in a column using SQL

Back-end developer
sql
distinct
Vincent Cotroat Mar 27, 2023
Easy
19 votes3321 runs1 comment

Update a column in an SQL table

Back-end developer
sql
update
Vincent Cotroat Nov 7, 2023
Easy
19 votes2186 runs0 comment

List the different build modes in Flutter

Mobile developer
build
modes
Clément Devos (W3D Team)at Jan 4, 2022
Medium
19 votes1523 runs0 comment

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

Data Scientist
machine learning
missing data
Martinat Apr 4, 2022
Easy
19 votes1123 runs1 comment

Load blog post data at build time for a static render.

Web developer
nextjs
static site generation
Anasat Nov 30, 2023
Easy
18 votes4937 runs
2 comments

Call a function on the first render of a React component

Web developer
react
hooks
Clément Devosat Jan 4, 2022
Easy
18 votes888 runs0 comment

What is the missing word in the following sentence: Overfitting is the production of a model that corresponds too closely to the training data set and may therefore fail to fit other data sets and so fail to perform any reliable forecast.

Data Scientist
overfitting
Martinat Mar 14, 2022