1508 interview questions for Back-end developer (2023)

Hard

15 votes979 runs2 comments

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

Web developer

Javascript

arrays

functions

Vincent Cotroat Mar 28, 2023

Easy

7 votes2944 runs0 comment

What is the minimum PHP version for Symfony 5?

Back-end developer

Symfony

php

Smaïne Millaniat Dec 3, 2021

Medium

7 votes1804 runs0 comment

Explain the prototype scope in Spring

Back-end developer

Spring

bean

Anonymous authorat Dec 21, 2021

Easy

7 votes1253 runs0 comment

How should a package be named in Java?

Full stack developer

Java

packages

Pierreat Sep 19, 2022

Medium

6 votes1913 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

6 votes1677 runs0 comment

The certificate variable is not attainable outside the if loop

Web developer

Javascript

variables

scope

Kahinaat Apr 6, 2022

Hard

6 votes1565 runs1 comment

Write a Javascript code that prints the indexes of an array.

Front-end developer

Javascript

array

for loop

Jean-marie Cléryat Nov 8, 2023

Medium

6 votes1268 runs1 comment

Write a Java program that prints 'welovedev'.

Full stack developer

Java

strings

variables

Pierreat Sep 19, 2022

Easy

6 votes810 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

Hard

5 votes2279 runs0 comment

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

Back-end developer

Java

inheritance

package

Thomas De verdièreat Jan 4, 2022

Expert

5 votes2215 runs0 comment

Write a finalizer in Java.

Back-end developer

Java

finalizer

Thomas De verdièreat Dec 16, 2021

Hard

5 votes795 runs0 comment

PHP code that throws an error.

Back-end developer

PHP

errors

Anonymous authorat Jan 4, 2022

Expert

5 votes655 runs0 comment

How to define a global variable with Node.js?

Back-end developer

NodeJS

variables

node.js

Jean-marie Cléryat May 11, 2022

Easy

5 votes119 runs1 comment

Import an add function from a TypeScript module math.ts

Web developer

Typescript

import

module

Lucasat May 30, 2023

Medium

4 votes2778 runs0 comment

What is the signature of `Kernel :: terminate()` in Symfony?

Back-end developer

Symfony

kernel

Smaïne Millaniat Dec 16, 2021

Hard

4 votes2291 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

Java

loops

control flow

Thomas De verdièreat Dec 16, 2021

Hard

4 votes2255 runs1 comment

Serialization can be customized with the Externalizable interface

Back-end developer

Java

serialization

interface

Thomas De verdièreat Jan 4, 2022

Easy

4 votes2251 runs0 comment

What are the visibility modifiers for a method in Java?

Back-end developer

Java

access modifiers

methods

Thomas De verdièreat Jan 4, 2022

Hard

4 votes2223 runs1 comment

How to write a portable Java program

Back-end developer

Java

native

Thomas De verdièreat Jan 4, 2022

Hard

4 votes2199 runs0 comment

What "design pattern" makes it possible to offer a means of treating the elements of a tree without worrying about the course?

Back-end developer

Java

design pattern

tree

Thomas De verdièreat Jan 4, 2022

1508 interview questionsfor Back-end developer (2023)

Test your technical skills before an interview of Back-end developer with 1508 corrected questions. Beginner, Intermediate or Expert level.

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

What is the minimum PHP version for Symfony 5?

Explain the prototype scope in Spring

How should a package be named in Java?

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

The certificate variable is not attainable outside the if loop

Write a Javascript code that prints the indexes of an array.

Write a Java program that prints 'welovedev'.

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

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

Write a finalizer in Java.

PHP code that throws an error.

How to define a global variable with Node.js?

Import an add function from a TypeScript module math.ts

What is the signature of `Kernel :: terminate()` in Symfony?

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; } ```

Serialization can be customized with the Externalizable interface

What are the visibility modifiers for a method in Java?

How to write a portable Java program

What "design pattern" makes it possible to offer a means of treating the elements of a tree without worrying about the course?