Skip to Content
Five Lines of Code
book

Five Lines of Code

by Christian Clausen
October 2021
Intermediate to advanced
336 pages
9h 16m
English
Manning Publications

Overview

In Five Lines of Code you will learn:

  • The signs of bad code
  • Improving code safely, even when you don’t understand it
  • Balancing optimization and code generality
  • Proper compiler practices
  • The Extract method, Introducing Strategy pattern, and many other refactoring patterns
  • Writing stable code that enables change-by-addition
  • Writing code that needs no comments
  • Real-world practices for great refactoring

Improving existing code—refactoring—is one of the most common tasks you’ll face as a programmer. Five Lines of Code teaches you clear and actionable refactoring rules that you can apply without relying on intuitive judgements such as “code smells.” Following the author’s expert perspective—that refactoring and code smells can be learned by following a concrete set of principles—you’ll learn when to refactor your code, what patterns to apply to what problem, and the code characteristics that indicate it’s time for a rework.

About the Technology
Every codebase includes mistakes and inefficiencies that you need to find and fix. Refactor the right way, and your code becomes elegant, easy to read, and easy to maintain. In this book, you’ll learn a unique approach to refactoring that implements any method in five lines or fewer. You’ll also discover a secret most senior devs know: sometimes it’s quicker to hammer out code and fix it later!

About the Book
Five Lines of Code is a fresh look at refactoring for developers of all skill levels. In it, you’ll master author Christian Clausen’s innovative approach, learning concrete rules to get any method down to five lines—or less! You’ll learn when to refactor, specific refactoring patterns that apply to most common problems, and characteristics of code that should be deleted altogether.

What's Inside
  • The signs of bad code
  • Improving code safely, even when you don’t understand it
  • Balancing optimization and code generality
  • Proper compiler practices


About the Reader
For developers of all skill levels. Examples use easy-to-read Typescript, in the same style as Java and C#.

About the Author
Christian Clausen works as a Technical Agile Coach, teaching teams how to refactor code.

Quotes
Down to earth, focused, and right on point. It will challenge you without intimidating you and without insulting your intelligence.
- Robert C. Martin

A delightful and fun introduction to one of the most overlooked parts of programming—refactoring.
- Charles Lam, EVN AG

Gave me new insights on how to keep my code readable and maintainable. I highly recommend it.
- John Norcott, Webstaurantstore

These techniques are simple but powerful, and the exercises makes it easy to learn them. They can be used in any language I know!
- Christian Hasselbalch Thoudahl, BEC Financial Technologies

Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.

Read now

Unlock full access

More than 5,000 organizations count on O’Reilly

AirBnbBlueOriginElectronic ArtsHomeDepotNasdaqRakutenTata Consultancy Services

QuotationMarkO’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.
Julian F.
Head of Cybersecurity
QuotationMarkI wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.
Addison B.
Field Engineer
QuotationMarkI’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.
Amir M.
Data Platform Tech Lead
QuotationMarkI'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
Mark W.
Embedded Software Engineer

You might also like

Code Complete, 2nd Edition

Code Complete, 2nd Edition

Steve McConnell
The Art of Clean Code

The Art of Clean Code

Christian Mayer

Publisher Resources

ISBN: 9781617298318Publisher SupportPublisher WebsiteErrata Page