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  • Clean Code: A Handbook of Agile Software Craftsmanship (Robert C. Martin Series)
  • Why did I write a second edition of Clean Code?Pearson Technology Group
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Clean Code: A Handbook of Agile Software Craftsmanship (Robert C. Martin Series)

by Robert Martin (Author) Format: Paperback
4.4 out of 5 stars (47)
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Purchase options and add-ons

Bestselling author Robert C. Martin brings new life and updated code to his beloved Clean Code book

With Clean Code, Second Edition, Robert C. Martin ("Uncle Bob") reinvigorates the classic guide to software craftsmanship with updated insights, broader scope, and enriched content. This new edition--a comprehensive rewrite of the original bestseller--is poised to transform the way developers approach coding, fostering a deeper commitment to the craft of writing clean, flexible, and maintainable code.

The book is divided into four parts: basic coding practices, design principles and heuristics, high-level architecture, and the ethics of craftsmanship. It challenges readers to critically evaluate code quality and reassess their professional values, ultimately guiding them to produce better software. This edition includes expanded coverage of testing disciplines, design and architecture principles, and multiple programming languages.

  • Design and architecture principles integrated with coding practices
  • Coverage of more languages, including Java, JavaScript, Go, Python, Clojure, C#, and C
  • Case studies for practical exercises in code transformation
  • Techniques for writing good names, functions, objects, and classes
  • Strategies for formatting code for maximum readability
  • Comprehensive error handling and testing practices
  • Productive use of AI tools for coding
  • Soft skills and the ethics of programming
  • SOLID principles of software design
  • Management of dependencies for flexible and reusable code
  • Professional practices and trade-offs in object-oriented design

Clean Code, Second Edition, underscores the importance of evolving software craftsmanship to meet contemporary challenges. Offering a deeper exploration of testing, design, and architecture, alongside universal coding principles applicable across various programming languages, this edition is set to be an indispensable resource for developers, engineers, and project managers. It not only aims to enhance technical skills but also to cultivate a professional ethos that values clean, flexible, and sustainable code.

Register your book for convenient access to downloads, updates, and/or corrections as they become available. See inside book for details.

Read more
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  1. ISBN-10
    0135398576
  2. ISBN-13
    978-0135398579
  3. Edition
    2nd
  4. Publisher
    Addison-Wesley Professional
  5. Publication date
    October 18, 2025
  6. Part of series
    Robert C. Martin Series
  7. Language
    English
  8. Dimensions
    7 x 1.35 x 9.13 inches
  9. Print length
    672 pages
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From the Publisher

Clean Code. Second Edition Cover

What can readers expect to learn?

Discover proven techniques for writing clear, maintainable, and efficient code, with practical strategies for refactoring, naming, and structuring functions and classes. Gain insights into identifying and eliminating code smells, fostering collaborative development, and implementing agile principles in daily workflows. Learn how to create robust unit tests, manage dependencies, and build software that stands the test of time—empowering teams to deliver higher-quality solutions with confidence and consistency.

Ideal for software developers, engineers, technical leads, and coders of any experience level committed to elevating code quality and fostering agile practices. Perfect for professionals in enterprise, startup, or open-source environments who value maintainable, efficient, and collaborative software solutions. Also highly relevant for computer science students, educators, and anyone passionate about mastering the principles of clean, professional coding in real-world projects.

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The Clean Coder: A Code of Conduct for Professional Programmers
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Customer Reviews
4.6 out of 5 stars 2,281
4.3 out of 5 stars 50
4.0 out of 5 stars 33
4.6 out of 5 stars 4,026
4.6 out of 5 stars 627
Price $24.96 $39.99 $38.50 $30.29 $23.22
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Uncle Bob Caricature

About the author

Robert C. Martin (“Uncle Bob”) is a renowned software engineer, consultant, and thought leader with over five decades of experience in the industry. As a co-author of the Agile Manifesto and founder of Uncle Bob Consulting, he has shaped modern software development practices worldwide. Martin’s influential works, including Clean Code, Clean Agile and Clean Architecture, are widely adopted by professionals seeking excellence in code quality and agile methodologies. His dedication to craftsmanship and his engaging presentations have earned him international recognition, making him a trusted authority in software engineering.

Editorial Reviews

Review

Praise for the First Edition of Clean Code

"Clean Code has changed the way I develop and maintain software in so many ways. It defines so well how code should be written, and I have not only learnt much from this book but have also put into practice many of its gems. I can honestly say that having gone on this journey, it is once again a pleasure to develop software and look at code that you are proud to have written."
--Steve Roberts, head of IT

"Reading Clean Code validated my inner sense of how software should be written, while also improving the quality of my work by teaching me things I didn't know. I'm grateful for this book and others by the same author as they remain fundamental prerequisites, even in the age of AI."
--Milos Baic, developer and solution architect

"[Clean Code] was the single most influential thing that I encountered in my career. Provided I was in a team that adhered to it, it took a lot of stress away as the code was suddenly more understandable and thus easier to maintain. To design something with testability in mind eliminated a lot of complexity in design and maintenance. Above all, it made programming feel cozy and fun again. The feeling gets stronger when you move from poor to a cleaner code base."
--Žarko Stojanović, staff software engineer

About the Author

Robert C. Martin (Uncle Bob) has been a programmer and software development expert since 1970. He is founder of Uncle Bob Consulting, LLC, and cofounder with his son Micah Martin of The Clean Coders LLC. Martin has published dozens of articles in various trade journals and is a regular speaker at international conferences and trade shows. He is the author of many books, including Agile Software Development: Principles, Patterns, and Practices; UML for Java Programmers; Clean Code; The Clean Coder; Clean Architecture; Clean Agile; Clean Craftsmanship; and Functional Design. Martin served for three years as editor-in-chief of the C++ Report and as the first chairman of the Agile Alliance.

Product details

  • Publisher ‏ : ‎ Addison-Wesley Professional
  • Publication date ‏ : ‎ October 18, 2025
  • Edition ‏ : ‎ 2nd
  • Language ‏ : ‎ English
  • Print length ‏ : ‎ 672 pages
  • ISBN-10 ‏ : ‎ 0135398576
  • ISBN-13 ‏ : ‎ 978-0135398579
  • Item Weight ‏ : ‎ 2.48 pounds
  • Dimensions ‏ : ‎ 7 x 1.35 x 9.13 inches
  • Part of series ‏ : ‎ Robert C. Martin Series
  • Best Sellers Rank: #47,208 in Books (See Top 100 in Books)
  • Customer Reviews:
    4.4 out of 5 stars (47)

About the authors

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  1. Robert C. Martin

    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
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    Robert Martin

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4.4 out of 5 stars
47 global ratings
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  • Brenda
    5 out of 5 stars
    Amazing book
    Reviewed in the United States on December 23, 2025
    Format: Paperback
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    This is an amazing book and totally clicked for me. I found Uncle Bob’s writing to be informative, easy to absorb, and entertaining. My only nit pick is that I felt that chapter 23, continuous design, was just a restatement of many of the points from previous chapters and did not really contain new information about design.

    One person found this helpful
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  • Buyer Colorado
    5 out of 5 stars
    Recommended
    Reviewed in the United States on December 20, 2025
    Format: Paperback
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    Excellent book, nice additions in this update including some interesting AI insights.

    Solid content for a professional software engineer, interesting read.

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  • Ketty Bonnet
    5 out of 5 stars
    FELIZ PORQUE YA TIENE LO QUE NECESITABA Y QUE LOS QUERIA PRONTO
    Reviewed in the United States on December 19, 2025
    Format: Paperback
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    Full content visible, double tap to read brief content.

    MI SOBRINO ESTA ESTUDIANDO PARA HACER ESTA CARRERA Y LOS 3 LIBROS SON PARA EL

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  • ange
    2 out of 5 stars
    Libro en mal estado
    Reviewed in Spain on April 30, 2026
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    El libro presenta marcas de desgaste y arañazos pese a que en la oferta pone que es nuevo.

    Libro en mal estado
    Libro en mal estado
    Libro en mal estado
    ange
    2 out of 5 stars
    Libro en mal estado
    Reviewed in Spain on April 30, 2026
    Format: Paperback

    El libro presenta marcas de desgaste y arañazos pese a que en la oferta pone que es nuevo.

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  • Amazon Customer
    5 out of 5 stars
    Solid update on writing good code
    Reviewed in Singapore on January 14, 2026
    Format: Paperback
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    Full content visible, double tap to read brief content.

    This edition is a relevant update on the previous one, extending its coverage on how to write good code. The concepts are practical and applicable, and is particularly useful for writing code that others can understand and easily build upon. A worthwhile read for anyone looking to improve their code quality and collaboration.

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  • Asharf Kabir
    5 out of 5 stars
    Clean code for the devs
    Reviewed in the United Kingdom on December 13, 2025
    Format: Paperback
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    Full content visible, double tap to read brief content.

    Read & learnt a lot from the first edition few years back and now it's time for the second.

    Clean code for the devs
    Clean code for the devs
    Asharf Kabir
    5 out of 5 stars
    Clean code for the devs
    Reviewed in the United Kingdom on December 13, 2025
    Format: Paperback

    Read & learnt a lot from the first edition few years back and now it's time for the second.

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  • Krešimir Sabljo
    4 out of 5 stars
    Damaged
    Reviewed in Germany on January 24, 2026
    Format: Paperback
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    My book is damaged!

    I will new one for my collection!

    Damaged
    Damaged
    Krešimir Sabljo
    4 out of 5 stars
    Damaged
    Reviewed in Germany on January 24, 2026
    Format: Paperback

    My book is damaged!

    I will new one for my collection!

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  • Mr H
    3 out of 5 stars
    Clean code with a dirty print
    Reviewed in the United Kingdom on November 15, 2025
    Format: Paperback
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    Full content visible, double tap to read brief content.

    I have yet to properly discover the content of the book, but I am very disappointed with the quality of the print. The book is not cheap and is riddled with smudged ink from low print quality.

    Will update my review once I get to know the book better, however, I don't think this should be acceptable quality for a particular price point, and considering it is not the first edition to be published.

    Clean code with a dirty print
    Mr H
    3 out of 5 stars
    Clean code with a dirty print
    Reviewed in the United Kingdom on November 15, 2025
    Format: Paperback

    I have yet to properly discover the content of the book, but I am very disappointed with the quality of the print. The book is not cheap and is riddled with smudged ink from low print quality.

    Will update my review once I get to know the book better, however, I don't think this should be acceptable quality for a particular price point, and considering it is not the first edition to be published.

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