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

# What does “Reverse an Array” mean?

Our task is to flip the elements of the array, meaning we will make the first element of the array the last element, the second element the second last element, and so on.

## Explanation

In the code snippet above, **(line number 13)**, we remove the last element of the array, which will be prepended to the array that is returned. 
We move the last element to the front of the resultant array and recursively reverse the rest of the array.


In each function call, we remove the last element and save it so it can get appended in front of the array once an array of size $1$ is reached.

> An array of size $0$ or $1$ will be our **base case, (line number 3 to 10)** because reversing such arrays returns the same array.

After the base case is satisfied, the remainder of the elements is appended in reverse order. When the last function returns the array will be reversed.

The sequence of function calls is as follows:

In this lesson, we will learn how to reverse an array recursively.

Recursion Fundamentals

Iteration Vs Recursion

Recursion with Numbers

Recursion with Strings

Recursion with Arrays

Recursion with Data Structures

Conclusion

Reverse an Array

What does “Reverse an Array” mean? #