66 interview questions for Software engineer (2026)

Medium

119 votes4667 runs

6 comments

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

Web developer

Anonymous authorat Jan 18, 2024

Medium

50 votes4280 runs4 comments

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

Web developer

promises

async

Anonymous authorat Mar 28, 2023

Easy

36 votes6421 runs

1 comment

Write the non-JSX equivalent of the following code:

Web developer

react

jsx

Victor Sabatierat Jan 4, 2022

Easy

32 votes4366 runs

2 comments

Fix the following Javascript loop:

Web developer

loops

conditions

Anonymous authorat Apr 27, 2023

Hard

17 votes3672 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

16 votes4764 runs

5 comments

The certificate variable is not attainable outside the if loop

Web developer

variables

scope

Anonymous authorat Apr 6, 2022

Hard

14 votes3683 runs1 comment

Serialization can be customized with the Externalizable interface

Back-end developer

serialization

interface

Thomas De verdièreat Jan 4, 2022

Hard

14 votes3608 runs0 comment

A monitor in Java

Back-end developer

java

thread

Thomas De verdièreat Jan 4, 2022

Hard

14 votes3507 runs0 comment

How many instance of Integer cannot be freed from memory?

Back-end developer

array

memory

Thomas De verdièreat Dec 16, 2021

Medium

13 votes4658 runs

7 comments

Print the number of countries in the array travel.

Web developer

array

for loop

Anonymous authorat Sep 5, 2022

Easy

13 votes4556 runs

3 comments

Use spread operator to split an array into two arrays in Javascript

Web developer

array

spread operator

Anonymous authorat Jul 19, 2024

Easy

13 votes4485 runs

1 comment

Write a Javascript code that displays 'Adversity is not to be feared' and 'There is potentially a real danger'

Web developer

booleans

conditionals

Adrienat Mar 30, 2022

Easy

12 votes4791 runs0 comment

What can be said about ECMAScript?

Web developer

standards

javascript

Anonymous authorat Apr 12, 2022

Hard

12 votes3703 runs0 comment

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

Back-end developer

inheritance

package

Thomas De verdièreat Jan 4, 2022

Easy

11 votes4532 runs2 comments

Write a for in loop in Javascript

Web developer

arrays

loops

Anonymous authorat Apr 6, 2022

Hard

11 votes3555 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

design pattern

tree

Thomas De verdièreat Jan 4, 2022

Easy

11 votes3489 runs

1 comment

Find the index of the last element of an array in JavaScript

Web developer

arrays

index

Axelat Sep 4, 2023

Hard

11 votes1228 runs0 comment

How to filter unique values from an array in Javascript?

Web developer

Raphaëlat Feb 28, 2025

Medium

9 votes4791 runs

4 comments

Write a switch statement that checks if a person can go down a slide based on their weight and height.

Web developer

switch

if else conditions

Anonymous authorat Apr 6, 2022

Medium

9 votes3457 runs2 comments

What does the following code show?

Back-end developer

java

variable

Thomas De verdièreat Jan 4, 2022

66 interview questionsfor Software engineer (2026)

Test your technical skills before an interview of Software engineer with 66 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.

Write the non-JSX equivalent of the following code:

Fix the following Javascript loop:

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

Serialization can be customized with the Externalizable interface

A monitor in Java

How many instance of Integer cannot be freed from memory?

Print the number of countries in the array travel.

Use spread operator to split an array into two arrays in Javascript

Write a Javascript code that displays 'Adversity is not to be feared' and 'There is potentially a real danger'

What can be said about ECMAScript?

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

Write a for in loop in Javascript

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

Find the index of the last element of an array in JavaScript

How to filter unique values from an array in Javascript?

Write a switch statement that checks if a person can go down a slide based on their weight and height.

What does the following code show?

66 interview questionsfor Software engineer (2026)

Test your technical skills before an interview of Software engineer with 66 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.

Write the non-JSX equivalent of the following code:

Fix the following Javascript loop:

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

Serialization can be customized with the Externalizable interface

A monitor in Java

How many instance of Integer cannot be freed from memory?

Print the number of countries in the array travel.

Use spread operator to split an array into two arrays in Javascript

Write a Javascript code that displays 'Adversity is not to be feared' and 'There is potentially a real danger'

What can be said about ECMAScript?

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

Write a for in loop in Javascript

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

Find the index of the last element of an array in JavaScript

How to filter unique values ​​from an array in Javascript?

Write a switch statement that checks if a person can go down a slide based on their weight and height.

What does the following code show?

How to filter unique values from an array in Javascript?