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Clean Code: A Handbook of Agile Software Craftsmanship 1st Edition

by Robert C. Martin (Author)

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Even bad code can function. But if code isn’t clean, it can bring a development organization to its knees. Every year, countless hours and significant resources are lost because of poorly written code. But it doesn’t have to be that way.

Noted software expert Robert C. Martin, presents a revolutionary paradigm with Clean Code: A Handbook of Agile Software Craftsmanship. Martin, who has helped bring agile principles from a practitioner’s point of view to tens of thousands of programmers, has teamed up with his colleagues from Object Mentor to distill their best agile practice of cleaning code “on the fly” into a book that will instill within you the values of software craftsman, and make you a better programmer―but only if you work at it.

What kind of work will you be doing? You’ll be reading code―lots of code. And you will be challenged to think about what’s right about that code, and what’s wrong with it. More importantly you will be challenged to reassess your professional values and your commitment to your craft.

Clean Codeis divided into three parts. The first describes the principles, patterns, and practices of writing clean code. The second part consists of several case studies of increasing complexity. Each case study is an exercise in cleaning up code―of transforming a code base that has some problems into one that is sound and efficient. The third part is the payoff: a single chapter containing a list of heuristics and “smells” gathered while creating the case studies. The result is a knowledge base that describes the way we think when we write, read, and clean code.

Readers will come away from this book understanding

How to tell the difference between good and bad code
How to write good code and how to transform bad code into good code
How to create good names, good functions, good objects, and good classes
How to format code for maximum readability
How to implement complete error handling without obscuring code logic
How to unit test and practice test-driven development
What “smells” and heuristics can help you identify bad code

This book is a must for any developer, software engineer, project manager, team lead, or systems analyst with an interest in producing better code.

ISBN-10

9780132350884
ISBN-13

978-0132350884
Edition

1st
Publisher

Pearson
Publication date

August 1, 2008
Language

English
Dimensions

7 x 1.1 x 9.2 inches
Print length

464 pages
See all details

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Popular Highlights in this book

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Functions should either do something or answer something, but not both.
Highlighted by 3,199 Kindle readers
The proper use of comments is to compensate for our failure to express ourself in code.
Highlighted by 2,855 Kindle readers
FUNCTIONS SHOULD DO ONE THING. THEY SHOULD DO IT WELL. THEY SHOULD DO IT ONLY.
Highlighted by 2,624 Kindle readers

From the Publisher

From the Preface of "Clean Architecture"

“…The rules of software architecture are the rules of ordering and assembling the building blocks of programs. And since those building blocks are universal and haven’t changed, the rules for ordering them are likewise universal and changeless.

But one thing has changed: Back then, we didn’t know what the rules were. Consequently, we broke them, over and over again. Now, with half a century of experience behind us, we have a grasp of those rules.

And it is those rules—those timeless, changeless, rules—that this book is all about.”

— Robert C. "Uncle Bob" Martin


Clean Code: A Handbook of Agile Software Craftsmanship	The Clean Code: Practical Advices for the Professional Programmer	Clean Craftsmanship: Desciplines, Standards, and Ethics	Clean Agile: Back to Basics	Clean Architecture: A Craftsman's Guide to Software Structure and Design
Best agile practices of cleaning code “on the fly” Software Craftsmanship.	Endure and succeed amidst swirling uncertainty and nonstop pressure.	Picks up where Clean Code leaves off, outlining additional ways to write quality and trusted code you can be proud of every day.	A clear and concise guide to basic Agile values and principles. Perfect for those new to Agile methods and long-time developers who want to simplify approaches for the better.	Direct, no-nonsense answers to key architecture and design questions.
"It is the best pragmatic application of Lean principles to software I have ever seen in print." —James O. Coplien, Founder of the Pasteur Organizational Patterns project	“Some technical books inspire and teach; some delight and amuse. Rarely does a technical book do all four of these things.” — George Bullock	". . . [A] timely and humble reminder of the ever-increasing complexity of our programmatic world and how we owe it to the legacy of humankind--and to ourselves--to practice ethical development.” — Stacia Heimgartner Viscardi, CST & Agile Mentor	“What is in the world of Agile development is nothing compared to what could be. This book is Bob’s perspective on what to focus on to get to that ‘what could be.’ And he’s been there, so it’s worth listening.” — Kent Beck	"A good architecture comes from understanding it more as a journey than as a destination, more as an ongoing process of enquiry than as a frozen artifact." — Kevlin Henney

Pick Up Where Clean Code Leaves Off

"As software developers, we have to continually solve important problems for our employers, customers, colleagues, and future selves. Getting the app to work, though difficult, is not enough, it does not make you a craftsman. With an app working, you have passed the app-titude test. You may have the aptitude to be a craftsman, but there is more to master. In these pages, Bob expresses clearly the techniques and responsibilities to go beyond the app-titude test and shows the way of the serious software craftsman."

— James Grenning, author of Test-Driven Development for Embedded C and Agile Manifesto co-author

Editorial Reviews

From the Back Cover

Even bad code can function. But if code isn’t clean, it can bring a development organization to its knees. Every year, countless hours and significant resources are lost because of poorly written code. But it doesn’t have to be that way.

Noted software expert Robert C. Martin presents a revolutionary paradigm with Clean Code: A Handbook of Agile Software Craftsmanship. Martin has teamed up with his colleagues from Object Mentor to distill their best agile practice of cleaning code “on the fly” into a book that will instill within you the values of a software craftsman and make you a better programmer―but only if you work at it.

What kind of work will you be doing? You’ll be reading code―lots of code. And you will be challenged to think about what’s right about that code, and what’s wrong with it. More importantly, you will be challenged to reassess your professional values and your commitment to your craft.

Clean Code is divided into three parts. The first describes the principles, patterns, and practices of writing clean code. The second part consists of several case studies of increasing complexity. Each case study is an exercise in cleaning up code―of transforming a code base that has some problems into one that is sound and efficient. The third part is the payoff: a single chapter containing a list of heuristics and “smells” gathered while creating the case studies. The result is a knowledge base that describes the way we think when we write, read, and clean code.

Readers will come away from this book understanding

How to tell the difference between good and bad code
How to write good code and how to transform bad code into good code
How to create good names, good functions, good objects, and good classes
How to format code for maximum readability
How to implement complete error handling without obscuring code logic
How to unit test and practice test-driven development

This book is a must for any developer, software engineer, project manager, team lead, or systems analyst with an interest in producing better code.

About the Author

Robert C. “Uncle Bob” Martin has been a software professional since 1970 and an international software consultant since 1990. He is founder and president of Object Mentor, Inc., a team of experienced consultants who mentor their clients worldwide in the fields of C++, Java, C#, Ruby, OO, Design Patterns, UML, Agile Methodologies, and eXtreme programming.

Product details

ASIN ‏ : ‎ 0132350882
Publisher ‏ : ‎ Pearson; 1st edition (August 1, 2008)
Language ‏ : ‎ English
Paperback ‏ : ‎ 464 pages
ISBN-10 ‏ : ‎ 9780132350884
ISBN-13 ‏ : ‎ 978-0132350884
Item Weight ‏ : ‎ 1.46 pounds
Dimensions ‏ : ‎ 7 x 1.1 x 9.2 inches

Best Sellers Rank: #5,356 in Books (See Top 100 in Books)
- #1 in Software Design & Engineering
- #2 in Software Testing
- #5 in Software Development (Books)

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Robert C. Martin
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Robert Cecil Martin (colloquially known as Uncle Bob) is an American software engineer and author. He is a co-author of the Agile Manifesto.
Bio from Wikipedia, the free encyclopedeia. Photo by Tim-bezhashvyly (Own work) [CC BY-SA 4.0 (http://creativecommons.org/licenses/by-sa/4.0)], via Wikimedia Commons.
See more on the author's page
Dean Wampler
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I am a principal software engineer at Domino Data Lab, an expert in MLOps, and a long-time member of the Scala community. I am also the author of several books:
-- "Programming Scala, Third Edition", a practical book for experienced software developers that introduces this important, modern programming language.
-- "Programming Hive", a comprehensive guide to Hive, the SQL tool for Hadoop (coauthors: Ed Capriolo and Jason Rutherglen).
-- "Functional Programming for Java Developers", a succinct introduction for Java developers to the concepts of functional programming, where I motivate its importance and demonstrate how to use FP concepts in Java programs.
You can find out more about me at these web sites:
-- http://deanwampler.com: My personal home page.
-- http://polyglotprogramming.com: Presentations, white papers, etc.
-- https://deanwampler.medium.com: My blog.
-- https://twitter.com/deanwampler
-- https://linkedin.com/in/deanwampler
My "off-line" interests include photography, hiking, skiing, and other mountain sports, cooking, and reading, including books that aren't about software!
See more on the author's page

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Kris

Very helpful

Reviewed in the United States 🇺🇸 on September 22, 2022

Verified Purchase

Writing clean code is tough, but this book makes it clearer.

One person found this helpful

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Peter J. Hanson

Excellent for the whole team

Reviewed in the United States 🇺🇸 on December 29, 2015

Verified Purchase

As CTO of a software company I co-founded, I'm not only looking for books that help me improve individually, but also books that the whole development team – from developers to architects – may find useful. Robert C. Martin’s Clean Code does both, and, like the good code described therein, it’s well written, clear, and easy to read. Martin includes many helpful examples and his suggestions are applicable to any programming language.

Ideally, each developer takes charge of their own education and is constantly improving their skillset, an aspect that Martin covers in The Clean Coder. I view it as an important part of my job to help my team improve. To do so, I distill a lot of written material down to actionable components and provide that to my development team. Concepts from Clean Code have become very helpful guides for them. Below are a few of my favorite takeaways.

The first is what Martin calls The Boy Scout Rule: “Leave the campground a little cleaner than you found it.” It’s a great concept, not only because it's simple to follow, but also because it has broad applicability and can be used on any project. Essentially, when a team member works on a piece of code, they should aim to improve it somehow by the time their task is finished. A few examples of this among many are: fixing an unclear variable name, breaking up a large function into smaller functions, or cleaning up a conditional for improved clarity. With everyone on the team doing this, the code improves over time and everyone feels responsible for the code whether they wrote it personally or not. Even if something can’t be addressed immediately, developers are encouraged to log the issues they see.

Another of my favorite takeaways is the Three Laws of TDD, a concept I was able to quickly roll out to the team as a framework to follow for how TDD should be conducted on a project. This virtually ensures that all of your product code has test coverage. It also helps make most of your code SOLID (https://en.wikipedia.org/wiki/SOLID_%28object-oriented_design%29), since code that is built in this fashion is structured with SOLID concepts in mind. This is a must for effective testing.

Finally, the topics of proper identifier names and commenting really resonated with me and my team. In our company, we tend to “adopt” existing codebases – projects that have already been started by other developers whose code is of widely varying quality. If we're lucky, it's structured well and demonstrates best practices and approaches in how it's constructed. Unfortunately, the code is sloppy at times and requires some TLC to get it in shape. A part of that process is understanding what the existing application does. As Clean Code correctly outlines, many comments are superfluous or even plain wrong and misleading. As a team, we don’t blindly trust the accuracy of existing comments and instead go right to the application’s code to determine what it does. This is where proper naming comes into play. With good names, the code reads like comments or as a narrative of what the application does, nullifying most needs for additional commenting. Simply put, the code comments itself. We also use refactoring tools to improve names and clean up comments as we go. Of course, by doing so, we’re also applying the Boy Scout Rule.

Overall, Clean Code is a wonderful book with much useful and immediately-applicable information for developers of all levels. If you're looking for a book that will help make you a better developer, this will.

7 people found this helpful

Helpful

Edvard Majakari

Understand rules well before breaking them

Reviewed in the United States 🇺🇸 on December 16, 2019

Verified Purchase

TL;DR: even if it is not 100% correct -- few are -- do read this book. It's a really good one.

I've been in the industry for 22+ years, but just started to reread this book. I consider it to be one of the top books _any_ software engineer, developer etc. should definitely read.

Now, I disagree with some of things strongly. Uncle Bob is quite biased towards OOP, and in general issues presented
are more complex and I'd claim that the only rule in software engineering is "it depends". In general my biggest complaint is that almost all of the rules I see anyone present come with a cost, with Clean Code it sounds like they are free. Eg. I really, really like simple, short functions/methods that do only one thing, but there is a cost of adding extra levels of abstraction. Even though I do prefer that over hundreds of thousands of lines of code in one method, it doesn't come as free (even though benefits far outweighs costs, given proper execution).

The other example, just to mention an example, is on naming variables. In general I agree that long, good names are much better than short cryptic ones, but for short expressions like one-line transformations are often _easier_ to read if variables are short, and their scope is limited to that one line. As an example, any experienced Python developer would immediately recognize `squares = [ n**2 for n in numbers if even(n) and n > 10]` while using longer names would just make general form (where var names don't matter). Many guides nowadays describe this principle as "variable name length should be in relation to scope of the variable" which is a good rule, though I believe even that has exceptions.

But having said that, I'd claim things would be in much, much better condition in software industry if people read this book. And definitely he has much more impressive track record than me, so I'm ready to accept that while I disagree with some of the things, I could very well be wrong (and still blind to it). SOLID principles are really good to understand, and the first one of those applies to _everything_, even if you use functional programming paradigm. Same goes for comments; comments are eventual lies, and developer should restrict IMO those to explaining _why_, not _what_.

I read the book first time when I had been 5+ years in the industry or so, and it definitely made me a better developer. And while I now see rationale behind the rules in the book a bit lacking given complexity and variance in common problems developers face (mainly every solution has a cost), I still consider the book one of the best ones. Just get it and read it.

14 people found this helpful

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Little Bobby Tables

I mean he calls himself Uncle Bob...

Reviewed in the United Kingdom 🇬🇧 on August 9, 2019

Verified Purchase

I have worked in both legacy code bases and green field projects over a long career. I bought this book many years ago, since I always am willing to learn, and had ample time to reflect on it. It's advice is not too bad, mostly obvious, but rather shallow and focused on the details I can quickly teach graduates, rather than the real depth I want them to think about. Still I didn't think strongly about posting a negative review until I looked at one of the author's own codebases, FitNesse. It defies so many of the author's own principles it beggers belief, but moreover is has a dreadful design for important reasons he doesn't cover. In this I am looking throughout the project's history: it's a house of cards. And that is very telling. Because here is a mediocre book from an author who rather incredibly calls himself "Uncle Bob", as if he is some friendly elder dispensing wisdom. Why do we fall for it, in a field of engineering and science? He would be better to mend his own fences before teaching others how to paint them.

49 people found this helpful

bomfirit

Gedrucktes PDF!!!

Reviewed in Germany 🇩🇪 on November 7, 2017

Verified Purchase

Das Buch sollte jeder Entwickler kennen. Pflichtlektüre! Aber, bitte nicht hier bestellen! Was man bekommt ist ein gedrucktes PDF, welches dummerweise in der falschen Papiergröße bedruckt ist. Man hat also an den Rändern riesige weiße Flächen. Das Buch ist daher unnötigerweise ca 25% größer als das Original. Zudem ist die verwendete Tinte sehr hell. Die Codebeispiele sind kaum zu lesen. Das Cover ist im Vergleich zum Original verwaschen. Das Buch geht sofort zurück und wird im Laden (zur Ansicht) bestellt. Jetzt weiß ich warum die Lieferzeit auch 3 Wochen betrug. Das Buch wird offensichtlich auf Anfrage gedruckt.

Bei den beigefügten Bildern sieht man das Original (von der Firma) und das hier bestellte Buch (PDF Druck)

214 people found this helpful

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Thomas

Leider eine billige Kopie, bitte nicht bestellen.

Reviewed in Germany 🇩🇪 on April 21, 2018

Verified Purchase

Meine Renzension bezieht sich ausschließlich auf das erhaltene Exemplar. Ich habe direkt bei Amazon bestellt (Verkauf & Versand durch Amazon), kein Marketplace.

Wie bereits von anderen Personen festgestellt, habe auch ich leider eine billige Kopie des Originals erhalten - vermutlich ein Druck der PDF-Version. Der Druck ist schlecht, das Format ist unnötigerweise sehr viel größer, das Cover ist verschwommen/verpixelt, kein bzw. weißer Buchrücken und -rückseite.

Hierfür über 29€ zu verlangen grenzt an Betrug. Ich habe das Exemplar unmittelbar zurückgeschickt. Schade.

86 people found this helpful

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Murilo

Conteúdo Excelente!

Reviewed in Brazil 🇧🇷 on January 31, 2020

Verified Purchase

Sou estudante de Ciência da Computação e realmente esse livro contribuiu muito para a minha visão do que é o ato de programar. Acabei pegando a versão inglês, pois li alguns comentários que diziam que a tradução não estava bem feita. Até entendo o porquê, acho muito difícil traduzir os códigos do livro e alguns conceitos. Porém, já aviso de antemão, o livro demanda bastante da sua dedicação!

45 people found this helpful

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randomboy93

This is a good book for beginner developers

Reviewed in the United Kingdom 🇬🇧 on February 8, 2018

Verified Purchase

This is a good book for beginner developers, or for whom who just want to review and refresh all the principles of the clean code. If you are an experienced programmer, I am sure that sometimes you will find this book obvious, and sometimes very illustrative.

Before reading this book, I recommend having a good understanding of Java and Object-Oriented programming. Don't forget Abstract classes, Interfaces, and Polymorphism.

In my opinion, it has more than 100 pages in excess.The appendixes and the chapter 14 (Refinement) don't contribute to anything. They are just boring. Also, I think that chapter 13 (Systems) could seem a little bit complex for beginners. It needs a very specific knowledge of Java, with concepts like EJB, JNDI, Proxies, and so on.

On the other hand, every concept is explained accurately with lots of examples. In addition, the "Smells and Heuristics" chapter summarizes the essence of this book very well.

17 people found this helpful

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