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.

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.

Recursion for Coding Interviews in JavaScript

# Understanding the Problem
In the previous lessons, we learned the basic concept of recursion, what it is and when it can be used. Now, we will discuss how recursion works.

Let's have a look at an example. The code below prints a pattern, that subtracts $5$ from the `targetNumber` until we reach a negative number or $0$. Then we add $5$ until we reach the `targetNumber` again.

For example:

If `targetNumber` $= 10$, then our pattern will be
$10\:$ $5\:$ $0\:$ $5\:$ $10$.

If `targetNumber` $= 8$, then our pattern will be $8$ $\:3$ $-2$ $\:3$ $\:8$.

In this lesson, we'll learn methods to understand and visualize a recursive function.

Recursion Fundamentals

Iteration Vs Recursion

Recursion with Numbers

Recursion with Strings

Recursion with Arrays

Recursion with Data Structures

Conclusion

Understanding a Recursive Problem

Understanding the Problem