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UdemyData Structures and AlgorithmsPaid courseAll LevelsCertificate

JavaScript Interview Questions - Coding Interview 2026 (Udemy.com)

Prepare for next JavaScript coding interview by doing practice questions. Learn javascript skills & concepts.

Created by: Oleksandr Kocherhin

Last updated February 2026

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What you will learn

  • Be very well prepared for any javascript programming interviews you will have
  • Excel in a wide variety of javascript interview questions that you could be asked in an interview
  • Strengthen you javascript programming skills and your knowledge of important javascript concepts
  • Learn the skills, concepts, and techniques necessary to excel in javascript coding interviews
  • Learn what programming interviews are like and what kind of questions to expect
  • Feel very confident going into any javascript programming interviews you will have

How it compares

Against the other 86 rated Udemy courses in Data Structures and Algorithms on CourseDuck:

  • Rating4.7 out of 5higher than 86% of them
  • Reviews1,325#21 of 87 by number of reviews
  • Length3.8 hoursshorter than 82% of them
  • Last updatedFebruary 2026more recently than 86% of them

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Course Description

This course is great preparation for any javascript programming interviews that you may have coming up. Programming interviews need a lot amount of knowledge, but the best way to prepare for interviews is a lot of practice! In this course you will complete 59 javascript interview questions that come from real javascript interviews. There are no excersises that nobody asks here. In every question we will get a task first, then you will try to solve each problem yourself, and then I will show you different solutions to each problem step-by-step for different programmer levels. We will take a deep dive into the skills, concepts, and techniques that are required to solve each problem.

When you have completed this course you will have mastered the 59 interview questions that we will cover, but you will also have learned the concepts, skills, and techniques, that are necessary for you to excel in any other interview questions you may be asked. You will feel very confident going into any javascript programming interviews you will have. On top of all this, you will strengthen your javascript programming skills and javascript fundamentals in overall.

Core topics of the course:

  • Closures

  • Hoisting

  • Currying

  • Classes & Prototypes

  • Modules

  • Working with DOM

  • Asyncronous Javascript (Callback, Promises, Async await)

  • Memoization

  • Transforming data with real world tasks

  • Creating own utility functions

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Instructor Details

Oleksandr Kocherhin

I am a full-stack developer with a passion for learning and teaching what I know. I have been programming for around 10 years and teaching for almost 6 years.

I believe in learning through doing and this philosophy is present in every course that I teach. I love exploring new web & mobile technologies and my courses focus on giving you the edge in our fast-moving industry.

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Reviews

4.7

1,325 ratings on Udemy

Select a bar to show only those reviews.Select the bar again to show every rating.

By Graeme Chetcuti on 12/2/2025

Very useful and challenging. As someone who used JavaScript on and off for like 10 years without much formal training, it is a fast way to update JS skills (only one new piece of info so far for me, but some good strategies which had me question what is most efficient) and great prep for interviews. Only one piece of info that I disagreed with, it is in section 28 - get the course and see if you agree with him...

By Govindharaju Krishnasamy on 7/28/2025

Am expecting more details about prototypes and throttle function. Why we can't use arrow function in prototype? i believe its has default bind methods but why we are using normal function and where need to use debounce and throttle methods i not even know the usecase

By Srinubabu Ravilla on 6/28/2025

The way you chose the examples which covers primarily interview questions and coding examples is your style of uniqueness. I really appreciate your presentation and wide coverage of the subject.

By Anonymized User on 11/30/2024

This course is a true surprise, an hidden gem! The course has a lot of Javascript challenges and then Oleksandr gives a clear explaination on the best approach to take for any problem, even for some pretty advanced topics.

By Shrikant Munde on 12/17/2023

I have 10 years of experience and after this course I feel myself as a beginner. Such a great content and the way it is explained is awesome.

By Anonymized User on 10/24/2023

It was such a good course, it is short but the teacher motivates us to try it by ourselves before watching the solution of the video so it makes us to think the solution.

By Szilvi Horvath on 3/7/2023

It's good content, however, I found it difficult to follow the instructor as he was speaking so fast, especially towards the more advanced topics.

By Kenny Andre Holmen on 8/17/2022

The course is really good if you need a deeper understanding of javascript methods and how to achieve things. However some places depending on previous experience things could be explained more clearly.

By Nicholas Haroldsen on 7/13/2022

This course has some great fundamental information that really helped me prepare for coding interviews. It is very concise and really helpful to get through quickly some great points of study that will possibly be asked in an interview.

By Brandon Flisfich on 5/25/2022

This course helped me to pass a few interviews! Well explained, good examples, understandable English. I suggest adding two more questions I was asked: 1. Implement Promise.All 2. Implement a memoization method: https://www.freecodecamp.org/news/understanding-memoize-in-javascript-51d07d19430e/ Other than that, it really covers everything )

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Quality Score

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Overall Score : 94 / 100