Master the JavaScript interview with expertly curated questions and solutions. Strategies developed by FAANG engineers help you prep faster, boost confidence, and refine your problem-solving skills.

Master the JavaScript interview by practicing 20 carefully curated interview questions and solutions. These problems will provide the tools you need to tackle any question you find in an interview. Allow ~1 hour per question.

Most questions have multiple solutions presented. All solutions are thoroughly explained and time and space complexity are discussed. A passing familiarity with these ideas is expected. You'll learn how to tackle different types of problems so you can proceed with confidence in your interviews.

These questions go beyond the common problems that we've all seen. FizzBuzz and bubble sort? We start past those.

We'll discuss how to refine algorithms. We'll go over clever, advanced ways of manipulating data that interviewers are looking for. You'll walk away more skilled and confident in your problem solving and interviewing abilities.

This course is taught in ES2015.

Master the JavaScript Interview

# Linked List Cycles

## Instructions

Describe a function that can detect the presence of loops in a Linked List. Rather than writing an actual function, describe the strategy you would employ.

**Input**: Linked List

**Output**: Boolean

## Hints

- From [JS Data Structures: Linked List](https://codeburst.io/js-data-structures-linked-list-3ed4d63e6571):

> A Linked List is an ordered, linear structure, similar to an array. Instead of items being placed at indices, however, they are connected through a chain of references, with each item containing a reference to the next item.

Learn how to find cycles in a Linked List. We'll cover two different methods.

Introduction

Strings & Arrays

Advanced Strings & Arrays

Algorithms & Data Structures

JavaScript Mastery

Conclusion

Linked List Cycles

Linked List Cycles

Instructions

Hints