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Intermediate

8h

Updated 1 month ago

Recursion for Coding Interviews in JavaScript

The ultimate guide to recursion interviews in JavaScript. Developed by FAANG engineers. Practice with real-world interview questions and get interview-ready in just a few hours.

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If you’ve ever struggled with solving problems using recursion, or if you have to brush up your skills for an interview, this course is for you. We'll start with the basics of what recursion is and why it’s important before diving into practicing solving actual questions. You’ll have access to detailed explanations and visualizations for each problem to help you along the way. By the time you have completed this course, you’ll be able to use all the concepts to solve complex real-world problems. We hope that through practicing recursion, you will be able to ace all recursion related questions in interviews at top tech companies.

If you’ve ever struggled with solving problems using recursion, or if you have to brush up your skills for an interview, this co...Show More

Content

58 Lessons6 Quizzes15 Challenges

1.

Recursion Fundamentals

7 Lessons

Get familiar with recursion concepts, memory management, and practical uses in JavaScript.

Who is this course for?

What is Recursion?

Recursion and Memory Visualization

Direct vs. Indirect Recursion

When to Use Recursion?

Understanding a Recursive Problem

Test Your Knowledge 1

2.

Iteration Vs Recursion

11 Lessons

Unpack the core of iteration vs. recursion, converting techniques, and practical challenges.

Overview of Iterative Functions

Difference Between Iteration and Recursion

Converting Iterative Code to Recursive Code

Count Vowels in a String

Challenge 1: Compute the Square of a Number

Solution Review: Compute the Square of a Number

Challenge 2: Search the First Occurrence of a Number

Solution Review: Search the First Occurrence of a Number

Challenge 3: The nth Fibonacci Number

Solution Review: Corresponding Fibonacci Number

Test Your Knowledge 2

3.

Recursion with Numbers

10 Lessons

Examine recursive solutions for numerical problems like powers, sums, GCD, Pascal's Triangle, and binary conversion.

Power of a Number

Sum of Integers from 1 to n

Challenge 1: Find the Greatest Common Divisor

Solution Review: Find the Greatest Common Divisor

Challenge 2: Pascal's Triangle

Solution Review: Pascal's Triangle

Challenge 3: Convert Decimal Number to Binary Number

Solution Review: Convert Decimal Number to Binary Number

Test Your Knowledge 3

4.

Recursion with Strings

10 Lessons

Break down complex ideas to handle strings recursively for manipulations, checks, and challenges.

Remove Spaces and Tabs in a String

Remove all Adjacent Duplicates from a String

Merge Two Sorted Strings Lexicographically

Challenge 1: Length of a String

Solution Review: Length of a String

Challenge 2: Sum of Digits in a String

Solution Review: Sum of Digits in a String

Challenge 3: Check Palindrome

Solution Review: Check Palindrome

Test Your Knowledge 4

5.

Recursion with Arrays

10 Lessons

Solve problems in recursion with arrays, including counting, reversing, replacing, averaging, balancing, and sorting.

Count all Occurrences of a Number

Reverse an Array

Replace all Negative Numbers with Zero

Challenge 1: Average of Numbers

Solution Review: Average of Numbers

Challenge 2: Balance Parenthesis

Solution Review: Balance Parenthesis

Challenge 3: Sort an Array

Solution Review: Sort an Array

Test Your Knowledge 5

6.

Recursion with Data Structures

9 Lessons

Focus on recursion in linked lists, graphs, and stacks with practical challenges and solutions.

Reverse Linked List

Depth First Traversal of Graph

Challenge 1: Length of a Linked List

Solution Review: Length of a Linked List

Challenge 2: Reverse a Stack

Solution Review: Reverse a Stack

Challenge 3: Topological Sorting of a Graph

Solution Review 3: Topological Sorting of a Graph

Test Your Knowledge 6

7.

Conclusion

1 Lessons

Practice using recursion to simplify code, especially for complex tasks like graph traversals.

More on Recursion

Certificate of Completion

Showcase your accomplishment by sharing your certificate of completion.

Developed by MAANG Engineers

Every Educative resource is designed by our in-house team of ex-MAANG software engineers and PhD computer science educators — subject matter experts who’ve shipped production code at scale and taught the theory behind it. The goal is to get you hands-on with the skills you need to stay ahead in today's constantly evolving tech landscape. No videos, no fluff — just interactive, project-based learning with personalized feedback that adapts to your goals and experience.

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Hands-on Learning Powered by AI

See how Educative uses AI to make your learning more immersive than ever before.

Personalized Interview Prep

Skip the LeetCode grind with a custom roadmap that adapts to your goals. Hands-on practice for Coding Interviews, System Design, and more.

Mock Interviews

Test your skills in a simulated interview setting. Receive personalized feedback based on your performance. Available for Coding Interviews, System Design, and more.

AI Prompt

Build prompt engineering skills. Practice implementing AI-informed solutions.

Code Feedback

Evaluate and debug your code with the click of a button. Get real-time feedback on test cases, including time and space complexity of your solutions.

Explain with AI

Select any text within any Educative course, and get an instant explanation — without ever leaving your browser.

AI Code Mentor

AI Code Mentor helps you quickly identify errors in your code, learn from your mistakes, and nudge you in the right direction — just like a 1:1 tutor!

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Free Resources

Frequently Asked Questions

Is recursion asked in JavaScript coding interviews?

Yes, recursion is frequently asked in JavaScript coding interviews, especially for problems like tree traversals, sorting algorithms, and backtracking.

What is the main purpose of recursion in JavaScript?

The main purpose of recursion is to solve problems by breaking them down into smaller subproblems, making it easier to handle complex data structures like trees and graphs.

Can JavaScript be used for coding interviews?

Absolutely! JavaScript is commonly used in coding interviews, particularly for frontend and full-stack roles, and recursion is an important topic.

Which is faster, loops or recursion, in JavaScript?

Loops are generally faster than recursion in JavaScript due to the overhead of function calls. However, recursion simplifies the code for problems like tree traversal.

When should I avoid using recursion in JavaScript?

Avoid recursion when dealing with large datasets or deep recursion levels, as this can cause stack overflow errors in JavaScript. Use iteration in such cases.

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