1530 interview questions for Back-end developer (2024)

Medium

32 votes1814 runs3 comments

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

Web developer

Vincent Cotroat Jan 18, 2024

Medium

19 votes1663 runs2 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

16 votes933 runs0 comment

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

Back-end developer

functions

errors

Vincent Cotroat Mar 24, 2023

Easy

15 votes1690 runs3 comments

Write a Java program that prints 'welovedev'.

Full stack developer

strings

variables

Pierreat Sep 19, 2022

Easy

15 votes1401 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

13 votes759 runs0 comment

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

Back-end developer

recursion

Vincent Cotroat Mar 28, 2023

Easy

11 votes1853 runs1 comment

Fix the following Javascript loop:

Web developer

loops

conditions

Camilleat Apr 27, 2023

Easy

10 votes3272 runs1 comment

What is the minimum PHP version for Symfony 5?

Back-end developer

php

symfony

Smaïne Millaniat Dec 3, 2021

Hard

10 votes1115 runs0 comment

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

Back-end developer

list

for loop

Théoat Mar 28, 2022

Hard

8 votes2590 runs0 comment

A Customer class has the com.company.model package.

Back-end developer

inheritance

package

Thomas De verdièreat Jan 4, 2022

Hard

8 votes2553 runs0 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

8 votes2385 runs1 comment

The certificate variable is not attainable outside the if loop

Web developer

variables

scope

Kahinaat Apr 6, 2022

Medium

8 votes2119 runs0 comment

A bean with a `session` scope is injected into a bean with a` singleton` scope. What happens when the application starts?

Back-end developer

spring

scope

Anonymous authorat Dec 21, 2021

Easy

8 votes1649 runs0 comment

How should a package be named in Java?

Full stack developer

packages

java

Pierreat Sep 19, 2022

Easy

8 votes1383 runs0 comment

Select only distinct values in a column using SQL

Back-end developer

sql

distinct

Vincent Cotroat Mar 27, 2023

Easy

8 votes1349 runs1 comment

Update a column in an SQL table

Back-end developer

sql

update

Vincent Cotroat Nov 7, 2023

Hard

7 votes2491 runs0 comment

A monitor in Java

Back-end developer

java

thread

Thomas De verdièreat Jan 4, 2022

Medium

7 votes2043 runs0 comment

Explain the prototype scope in Spring

Back-end developer

spring

bean

Anonymous authorat Dec 21, 2021

Hard

7 votes1797 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

Medium

7 votes1340 runs1 comment

Write the SQL query to delete a column from a table

Back-end developer

sql

table

column

Vincent Cotroat Mar 27, 2023

1530 interview questionsfor Back-end developer (2024)

Test your technical skills before an interview of Back-end developer with 1530 corrected questions. Beginner, Intermediate or Expert level.

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

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

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

Write a Java program that prints 'welovedev'.

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

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

Fix the following Javascript loop:

What is the minimum PHP version for Symfony 5?

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

A Customer class has the com.company.model package.

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; } ```

The certificate variable is not attainable outside the if loop

A bean with a `session` scope is injected into a bean with a` singleton` scope. What happens when the application starts?

How should a package be named in Java?

Select only distinct values in a column using SQL

Update a column in an SQL table

A monitor in Java

Explain the prototype scope in Spring

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

Write the SQL query to delete a column from a table