Most Difficult Javascript Interview Questions

| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |

👻 Check our latest review to choose the best laptop for Machine Learning engineers and Deep learning tasks!

Information technology is one of the most profitable and rewarding areas of business. But before you get that awesome CS gig, you need to go through the application process. That’s why we’ve put together this guide - to help you prepare for the most common IT interview questions.

With the growing tech industry, computer science has become a popular career choice for many students. Common roles for which computer science graduates apply are: computer engineer, computer engineer, software development engineer, computer software developer, and application engineer.

Computer Science is one of the most profitable graduates ; s through engineering, mathematics, science and business. As a computer science graduate, you can earn an average salary of $ 50 - $ 130,000 per year . In this area, you will also have great potential for growth as salaries for IT professionals are known to increase dramatically from year to year.

Computer technical interview questions

A person speaking in an interview.
Being good at a technical interview can be the difference between getting hired or fired .

To help you with your interview process, we’ve compiled some tips and tricks that you can use to make your interview a success. Here is a list of some common IT questions you can ask. help to get good results at your next interview.

in a computer maintenance, your answers to general questions and techniques will be an important factor in your selection for the position. the Most questions will be based on coding, programming languages ‚Äã‚Äã, operating systems, hardware and software computer and other subjects related to computer systems.

These are the types of q uestions that establish basic knowledge. For example, what is a class / superclass? What is an object? What is a file? Linked list, class variable, multiple inheritance, base class, input and output, conversion constructor, object oriented programming, etc.

Let’s take a look at some technical interview questions and answer the questions above.

Which programming languages ‚Äã‚Äãdo you prefer and why?

This is a very simple question and you should know that there is no right answer. If the position you are applying for requires knowledge of a certain language, you can mention a few things you like about that particular language. Or you can mention your preferred language and justify your preference. For example:

JavaScript is my favorite language because it is easy to use and my main choice for final back-development. Before JavaScript websites were static, however after JS the web equation changed. Now with JS we have features that help build user friendly and vibrant websites. Here are a few reasons why JS is my favorite programming language to work with.

What is a class and a superclass?

The answer to this question is similar to the others should be at the beginning of the language. You can answer this question as follows:

A class defines the project from which the class objects are created example, the characteristics of an object and with which methods and variables it is associated. A super class, on the other hand, refers to the considered direct class.

What is the difference between Process and Thread?

Although a process and a thread may seem conceptually similar, the two are independent sequences of execution. You can answer this question as follows:

Process is a running program. The thread is a segment of a process, which means that a process can have multiple threads.

Compared to a thread, the process takes longer to complete. The process also takes longer to create while the thread takes less time. The process is isolated while the threads share memory.

What is a constructor?

In object oriented programming, a constructor is a method of a class or structure and initializes an object of that type. Your answer might look like this:

Most of the CS interview questions as discussed above will revolve around similar concepts.

Common questions for IT interviews

  • What is a message ?
  • What is a feed ?
  • How many types of access modifiers are there ? Name and define each of them.
  • What is the application layer?
  • Name the main types of constructors.
  • Explains some main types of access modifiers.
  • What is the transport layer?
  • What is the difference between an interface and an abstract class?
  • Describe a singleton class.
  • What is an abstract class ?
  • What is an abstract keyword ?
  • Provide C source code
  • What is a byte stream ?
  • Name a type of balanced binary tree. It explains how it is implemented.
  • What is a view?
  • How does the central processing unit (CPU) work in a computer system?
  • What is GitHub, and how do you use it ?
  • Explain how a wrapper class works.
  • What is an array ?
  • What does a system work ? Give some examples of common operating systems in use today.
  • Comparison of method and constructor.
  • What is a data structure ?
  • List the steps for creating an object.
  • Explains the purpose of the data link layer.
  • What is recursion?
  • Explain the difference between overload and overwrite.
  • What JavaScript frameworks do you know?
  • What do you know about the software development cycle?
  • What is polymorphism?

Here are some examples of technical interview questions you can expect at your next interview. The best way to prepare would be to review basic CS concepts first. Then, start to compare concepts, identify similarities and differences, and understand the structure and components involved in each concept. You should also check websites like Glassdoor for the types of questions asked of previous applicants for a similar position.

If you are in an interviewee, the interviewer may ask you to answer questions on a whiteboard. . These whiteboard interview questions often ask you to troubleshoot programming issues in real time. In a telephone interview, however, the goal will be to provide your understanding of the concepts and their application.

Behavioral interview questions

When preparing for an IT interview, do not assume that the hiring manager will only ask questions. technical issues. The behavioral interview questions have become an important part of the recruiting process in most companies. This applies to both tech giants and startups.

Behavioral questions are typically worded like this:

  • Tell me about a time when ...
  • Describe a situation where ...
  • Give me an example of a time ...

The purpose of the behavioral questions is to allow the employer to understand the results you have obtained in your past work experience. For example, how you applied your knowledge and skills from your previous job to take concrete " action ‚". This action could be a task that you completed successfully, a team that you managed, or an actual issue that you resolved.

The interviewer can also ask general questions. For example:

Make sure to review your resume several times before the interview so that you can answer any resume-related questions as well.

Ask your questions

The hard part is over ; however, the last part that a lot of people also tend not to pay a lot of attention is very important. In this final step, you can show the interviewer that you are interested in the job and that you have been attentive throughout the interview process.

So at the end when an interviewer asks "Do you have questions for me?" You should always have a list of 2-3 questions. You can ask a follow-up question based on the job description or ask questions about the team.


Preparing for the interview is not an easy process. It takes time and dedication. And this is especially true when it comes to preparing for IT interviews. Each company has a different way of interviewing. You can see sample interview questions for the job on sites like Glassdoor. That way, you can get a feel for the type of questions they might be asking you.

Also be sure to go through the hiring process after the interview. If you don’t get a response from the hiring manager within days, you should contact them and request updates. This shows them that you are still interested in the job and that you know how to take initiatives.

👻 Read also: what is the best laptop for engineering students?

We hope this article has helped you to resolve the problem. Apart from Most Difficult Javascript Interview Questions, check other __main__ Python module-related topics.

Want to excel in Python? See our review of the best Python online courses 2023. If you are interested in Data Science, check also how to learn programming in R.

By the way, this material is also available in other languages:

Xu Williams

Massachussetts | 2023-01-27

Simply put and clear. Thank you for sharing. Most Difficult Javascript Interview Questions and other issues with UI PHP module was always my weak point 😁. Will use it in my bachelor thesis

Anna Robinson

Paris | 2023-01-27

Thanks for explaining! I was stuck with Most Difficult Javascript Interview Questions for some hours, finally got it done 🤗. Will use it in my bachelor thesis

Manuel Chamberlet

Massachussetts | 2023-01-27

Simply put and clear. Thank you for sharing. Most Difficult Javascript Interview Questions and other issues with select Python module was always my weak point 😁. I am just not quite sure it is the best method


Gifts for programmers

Learn programming in R: courses

Gifts for programmers

Best Python online courses for 2022

Gifts for programmers

Best laptop for Fortnite

Gifts for programmers

Best laptop for Excel

Gifts for programmers

Best laptop for Solidworks

Gifts for programmers

Best laptop for Roblox

Gifts for programmers

Best computer for crypto mining

Gifts for programmers

Best laptop for Sims 4


Latest questions


Common xlabel/ylabel for matplotlib subplots

1947 answers


Check if one list is a subset of another in Python

1173 answers


How to specify multiple return types using type-hints

1002 answers


Printing words vertically in Python

909 answers


Python Extract words from a given string

798 answers


Why do I get "Pickle - EOFError: Ran out of input" reading an empty file?

606 answers


Python os.path.join () method

384 answers


Flake8: Ignore specific warning for entire file

360 answers


Python | How to copy data from one Excel sheet to another

Common xlabel/ylabel for matplotlib subplots

Check if one list is a subset of another in Python

How to specify multiple return types using type-hints

Printing words vertically in Python

Python Extract words from a given string

Cyclic redundancy check in Python

Finding mean, median, mode in Python without libraries

Python add suffix / add prefix to strings in a list

Why do I get "Pickle - EOFError: Ran out of input" reading an empty file?

Python - Move item to the end of the list

Python - Print list vertically