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1347 interview questionsfor Full stack developer (2026)

Test your technical skills before an interview of Full stack developer with 1347 corrected questions. Beginner, Intermediate or Expert level.

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1347 questions
Medium
118 votes4649 runs
6 comments

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

Web developer
Vincent Cotroat Jan 18, 2024
Easy
50 votes4264 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
39 votes3335 runs
13 comments

Write a Java program that prints 'welovedev'.

Full stack developer
strings
variables
Pierreat Sep 19, 2022
Easy
39 votes2338 runs1 comment

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

Back-end developer
functions
errors
Vincent Cotroat Mar 24, 2023
Easy
36 votes6410 runs
1 comment

Write the non-JSX equivalent of the following code:

Web developer
react
jsx
Victor Sabatierat Jan 4, 2022
Easy
32 votes6372 runs1 comment

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

Web developer
props
list
Victor Sabatierat Jan 4, 2022
Easy
32 votes4352 runs
2 comments

Fix the following Javascript loop:

Web developer
loops
conditions
Anonymous authorat Apr 27, 2023
Easy
32 votes3893 runs2 comments

Create a form with two mandatory fields in Angular

Web developer
angular
form
validation
Anonymous authorat Jan 4, 2022
Easy
23 votes2092 runs1 comment

What is TypeScript?

Web developer
typescript
javascript
angular
Anonymous authorat Mar 29, 2022
Easy
21 votes1250 runs1 comment

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

Web developer
nextjs
static site generation
Anas ISMAILIat Nov 30, 2023
Easy
18 votes5127 runs
2 comments

Call a function on the first render of a React component

Web developer
react
hooks
Clément Devosat Jan 4, 2022
Easy
17 votes3862 runs
3 comments

Which provider is recommended for DOM manipulation in Angular?

Web developer
angular
dom
Anonymous authorat Jan 4, 2022
Easy
17 votes3823 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
Hard
17 votes3663 runs
1 comment

How many times is the condition `(a++ < 15)` evaluated in the following code? ```java int a = 3; while (a++ < 15) { if ((a++ % 5) == 0) break; } ```

Back-end developer
loops
control flow
Thomas De verdièreat Dec 16, 2021
Easy
17 votes3227 runs
2 comments

How should a package be named in Java?

Full stack developer
packages
java
Pierreat Sep 19, 2022
Easy
16 votes3747 runs1 comment

What is the minimum PHP version for Symfony 5?

Back-end developer
php
symfony
Smaïne Millaniat Dec 3, 2021
Medium
16 votes1002 runs0 comment

What is the best practice to apply in your code to improve the performance of your application?

Back-end developer
performance
gzip
Vincent Cotroat Nov 15, 2023
Easy
15 votes6472 runs
2 comments

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

Web developer
state
react
Clément Devosat Nov 7, 2023
Easy
15 votes4751 runs
5 comments

The certificate variable is not attainable outside the if loop

Web developer
variables
scope
Anonymous authorat Apr 6, 2022
Medium
15 votes2985 runs0 comment

Which of the following statements are true ?

Back-end developer
functions
variables
Anonymous authorat Mar 28, 2022
Full stack developer tests