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

function decimalToBinary(testVariable) {
  // Base case
  if (testVariable <= 1) {
    return String(testVariable)
  }

  // Recursive case
  else {
    return decimalToBinary(Math.floor(testVariable / 2)) + decimalToBinary(testVariable % 2)
  }
}

// Driver Code
var testVariable = 11
console.log(decimalToBinary(testVariable))

## Explanation:

The simple method for converting a decimal number to a binary number is to keep track of the $remainder$ and the leftover $dividend$ when a number is divided by $2$.
Look at the illustration below:

This review provides a detailed analysis of the solution to convert a decimal number to a binary number.

Recursion Fundamentals

Iteration Vs Recursion

Recursion with Numbers

Recursion with Strings

Recursion with Arrays

Recursion with Data Structures

Conclusion

Solution Review: Convert Decimal Number to Binary Number

Solution: Using Recursion

Explanation: