Head First Algorithms and Data Structures

Chapter 1. Comparing Algorithms: A Recipe for Speed

A Note for Early Release Readers

With Early Release ebooks, you get books in their earliest form—the author’s raw and unedited content as they write—so you can take advantage of these technologies long before the official release of these titles.

This will be the 1st chapter of the final book.

If you’d like to be actively involved in reviewing and commenting on this draft, please reach out to the editor at [e-mail].

Your app works perfectly with test data, but crashes with real users. Everything looked great when processing 100 items, but are choking on 10,000. Your reviews are tanking, and you’re scrambling to fix your app.

This isn’t a coding problem; it’s an algorithmic problem.

Why care about algorithms? Because they’re what make the difference between a quick search and a spinning wheel, an app people love and one they delete, and a startup that scales and one that crashes. It may even be the difference between a promotion and not.

This book will rewire your brain to think about your code’s efficiency from the ground up. We’ll be seeing problems through a computer scientist’s eyes: breaking them down, identifying patterns, and creating solutions that work whether you’re sorting 10 items or 10 million. You’ll also learn to pair the right data structures with your algorithms, because even the best algorithm falls ...