The ultimate guide to recursion interviews with strategies developed by FAANG engineers. Practice with real-world interview questions, detailed explanations, and visualizations to prep faster.

If you’ve got an interview coming up and want to brush up on your knowledge, or if you’ve ever struggled with solving coding problems using recursion, you'll find this course helpful.
 
You’ll start with the basics of what recursion is and why it’s important before diving into what it looks like in practice. You’ll see how recursion can help you solve a variety of different math, string, and data structure problems by using interactive code playgrounds that you can execute directly in your browser. You’ll have access to detailed explanations and visualizations for each problem to help you along the way.  
 
By the time you’re done, you’ll be able to use what you’ve learned to solve complex real-world problems and even advance more easily through your interviews at top tech companies.

Recursion for Coding Interviews in Java

## What is iteration?

**Iterative code** is a block of code that runs in a **loop**. In other words, the same code is repeated over and over again. The idea is similar to that of recursion. 

As you get comfortable with the recursion concept, you might not use iteration that frequently as you solve your problems, but there are definitely cases where you will find it valuable. This is also one of the easiest ways to ease yourself into recursion because we already understand how to iterate over arrays and lists. Recursion is basically taking the same concept forward but with some modifications. 

For example,
- Print a Linked List in reverse order
- Factorial of a number
- Fibonacci series
- A problem where you expect to use a variable number of loops 

# What is iteration?

**Iterative code** is a block of code that runs in a **loop**. In other words, the same code is repeated over and over again. The idea is similar to that of recursion. 

As you get comfortable with the recursion concept, you might not use iteration that frequently as you solve your problems, but there are definitely cases where you will find it valuable. This is also one of the easiest ways to ease yourself into recursion because we already understand how to iterate over arrays and lists. Recursion is basically taking the same concept forward but with some modifications. 

For example,
- Print a Linked List in reverse order
- Factorial of a number
- Fibonacci series
- A problem where you expect to use a variable number of loops 

This lesson introduces to the basics of iteration.

Fundamentals of Recursion

Iteration to Recursion

Recursion with Numbers

Recursion with Strings

Recursion with Arrays

Recursion with Data Structures

Iteration

What is iteration?