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JavaScript Interview Prep: Real Coding Questions & Solutions

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JavaScript Interview Prep: Real Coding Questions & Solutions

This course is part of multiple programs.

2,513 already enrolled

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Gain insight into a topic and learn the fundamentals.
4.6

36 reviews

Intermediate level

Recommended experience

3 hours to complete

Gain insight into a topic and learn the fundamentals.
4.6

36 reviews

Intermediate level

Recommended experience

3 hours to complete

What you'll learn

  • JavaScript

  • Tech interview practice

Details to know

Shareable certificate

Add to your LinkedIn profile

Assessments

3 assignments

Taught in English
Flexible schedule
Learn at your own pace

Build your subject-matter expertise

This course is available as part of
When you enroll in this course, you'll also be asked to select a specific program.
  • Learn new concepts from industry experts
  • Gain a foundational understanding of a subject or tool
  • Develop job-relevant skills with hands-on projects
  • Earn a shareable career certificate

There are 3 modules in this course

Your essential tech interview preparation pack! Practice solving problems and honing the skills you need to succeed in a frontend coding interview.

Are you applying for frontend developer roles? Do you wish to test out your JavaScript knowledge? Do you love solving code challenges? If any of the above applies to you, JavaScript Interview Challenges should be your next Scrimba course! This bumper pack of challenges provides you with 30 code questions similar to those which are commonly used in technical interviews, plus solutions suggested by an industry professional. Through solving the challenges, you’ll practice strings and string methods, arrays and array methods, working with data and APIs, and β€œclassic” interview challenges such as reversing a string, finding anagrams and, of course, Fizzbuzz! You’ll also hone your skills in writing and reading pseudo code, maximizing your use of built-in methods, performing effective code research, and using console.logs effectively to debug. With the suggested solutions on hand to help you to optimize your code and assist if you have difficulty, JavaScript Interview Challenges will give you the knowledge and experience you need to walk into your next tech interview with confidence! You won’t find yourself stuck during this course as teacher Treasure provides a solution to each challenge. If any of the questions catch you out, you can study the solutions and then try again. You can even use JavaScript Interview Challenges to practice solving problems out loud, a skill critical to success in interviews and your tech career! No plans to interview soon? You can also use this course to review and build your coding knowledge, brush up your skills if you’re feeling a little rusty, or even solve code problems for fun! This is your course, to use however you see fit. In summary, this is the ideal course for any JavaScript learner, whether they plan to interview soon, want to learn some handy code optimizations, or just love cracking code challenges.

Practice solving common JavaScript interview questions focused on strings, conditionals, and simple logic.

What's included

1 assignment24 plugins

1 assignmentβ€’Total 30 minutes
  • Working with Strings and Basic Logic Interview Challenges Graded Assignmentβ€’30 minutes
24 pluginsβ€’Total 54 minutes
  • Welcome to interactive lessons!β€’1 minute
  • Intro to JavaScript Interview Challengesβ€’6 minutes
  • Challenge - Panic Functionβ€’1 minute
  • Solution - Panic Functionβ€’1 minute
  • Challenge - Shh... Whispering Functionβ€’1 minute
  • Solution - Shh... Whisper Functionβ€’2 minutes
  • Challenge - Alternating Capsβ€’1 minute
  • Solution - Alternating Capsβ€’2 minutes
  • Challenge - toTitleCase()β€’1 minute
  • Solution - toTitleCase()β€’2 minutes
  • Challenge - Definitely Not FizzBuzzβ€’1 minute
  • Solution - Definitely Not FizzBuzzβ€’4 minutes
  • Challenge - Emojify!β€’3 minutes
  • Solution - Emojify!β€’5 minutes
  • Challenge: Is it an Anagram?β€’1 minute
  • Solution - Is It an Anagram?β€’3 minutes
  • Challenge - Decode an Alien Messageβ€’3 minutes
  • Solution - Decode an Alien Messageβ€’4 minutes
  • Challenge - Palindromesβ€’1 minute
  • Solution - Palindromesβ€’3 minutes
  • Challenge - Save Grandpa's Passwordβ€’3 minutes
  • Solution - Save Grandpa's Passwordβ€’1 minute
  • Challenge - Frequency of Letters in Your Nameβ€’1 minute
  • Solution - Frequency of Letters in Your Nameβ€’3 minutes

Build confidence with challenges involving arrays, objects, and multi-step problem-solving techniques.

What's included

1 assignment17 plugins

1 assignmentβ€’Total 20 minutes
  • Arrays, Objects, and Intermediate Logic Graded Assignment β€’20 minutes
17 pluginsβ€’Total 32 minutes
  • Challenge: Chef Mario's Recipe Bookβ€’1 minute
  • Solution Pt 1: Chef Mario's Recipe Bookβ€’2 minutes
  • Solution Pt 2: Chef Mario's Recipe Bookβ€’4 minutes
  • Challenge - Pumpkin's Prizesβ€’1 minute
  • Solution - Pumpkin's Prizesβ€’3 minutes
  • Challenge - Count the Scrimba Studentsβ€’1 minute
  • Solution - Count the Scrimba Studentsβ€’2 minutes
  • Challenge - Pizza Night?β€’1 minute
  • Solution - Pizza Night?β€’4 minutes
  • Challenge - Totally Private Data Farmβ€’1 minute
  • Solution - Totally Private Data Farmβ€’2 minutes
  • Challenge - Find Free Podcastsβ€’1 minute
  • Solution - Find Free Podcastsβ€’2 minutes
  • Challenge - Candy Saleβ€’1 minute
  • Solution - Candy Saleβ€’2 minutes
  • Challenge - Shopping Cartβ€’1 minute
  • Solution - Shopping Cartβ€’3 minutes

Solve more complex JavaScript challenges that involve deeper logic, nested structures, and multi-step reasoning.

What's included

1 assignment22 plugins

1 assignmentβ€’Total 15 minutes
  • Advanced Logic and Problem-Solving Graded Assignmentβ€’15 minutes
22 pluginsβ€’Total 56 minutes
  • Challenge - Total Savory Itemsβ€’1 minute
  • Solution - Total Savory Itemsβ€’3 minutes
  • Challenge - Holiday Gift Shoppingβ€’1 minute
  • Solution - Holiday Gift Shoppingβ€’3 minutes
  • Challenge - Collect Unique Genre Tagsβ€’1 minute
  • Solution Pt 1: Collect Unique Genre Tagsβ€’4 minutes
  • Solution Pt 2: Collect Unique Genre Tagsβ€’3 minutes
  • Challenge - Welcome Aboard Scrimba Airlinesβ€’1 minute
  • Solution - Welcome Aboard Scrimba Airlinesβ€’4 minutes
  • Challenge - Popularity Contestβ€’1 minute
  • Solution - Popularity Contestβ€’3 minutes
  • Challenge - Night at the Scrimbiesβ€’1 minute
  • Solution - Night at the Scrimbiesβ€’5 minutes
  • Challenge - Save the Weekendβ€’2 minutes
  • Solution - Save the Weekendβ€’3 minutes
  • Challenge - Find Anagrams in an Arrayβ€’2 minutes
  • Solution - Find Anagrams in an Arrayβ€’3 minutes
  • Challenge - Emoji Flower Bedβ€’1 minute
  • Solution - Emoji Flower Bedβ€’2 minutes
  • Challenge - Emoji Slot Machineβ€’1 minute
  • Solution - Emoji Slot Machineβ€’5 minutes
  • Congrats on Finishing! (What's Next?)β€’6 minutes

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Instructor

Instructor ratings
4.3 (14 ratings)
Scrimba
3 Coursesβ€’9,431 learners

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FS
Β·

Reviewed on Jun 22, 2025

good questions, good methodology on the answers

some quiz questions are ambiguous

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