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  • Refactoring: Improving the Design of Existing Code (2nd Edition) (Addison-Wesley Signature Series (Fowler))

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Refactoring: Improving the Design of Existing Code (2nd Edition) (Addison-Wesley Signature Series (Fowler))

by Martin Fowler (Author) Format: Hardcover
4.7 out of 5 stars (1,228)

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"Whenever you read [Refactoring], it’s time to read it again. And if you haven’t read it yet, please do before writing another line of code." –David Heinemeier Hansson, Creator of Ruby on Rails, Founder & CTO at Basecamp


Fully Revised and Updated—Includes New Refactoring's and Code Examples

“Any fool can write code that a computer can understand. Good programmers write code that humans can understand.”
–M. Fowler (1999)

For more than twenty years, experienced programmers worldwide have relied on Martin Fowler’s Refactoring to improve the design of existing code and to enhance software maintainability, as well as to make existing code easier to understand.


This eagerly awaited new edition has been fully updated to reflect crucial changes in the programming landscape. Refactoring, Second Edition, features an updated catalog of refactoring's and includes JavaScript code examples, as well as new functional examples that demonstrate refactoring without classes.


Like the original, this edition explains what refactoring is; why you should refactor; how to recognize code that needs refactoring; and how to actually do it successfully, no matter what language you use.

  • Understand the process and general principles of refactoring
  • Quickly apply useful refactorings to make a program easier to comprehend and change
  • Recognize “bad smells” in code that signal opportunities to refactor
  • Explore the refactorings, each with explanations, motivation, mechanics, and simple examples
  • Build solid tests for your refactorings
  • Recognize tradeoffs and obstacles to refactoring

Includes free access to the canonical web edition, with even more refactoring resources. (See inside the book for details about how to access the web edition.)

Read more
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  1. ISBN-10
    0134757599
  2. ISBN-13
    978-0134757599
  3. Edition
    2nd
  4. Publisher
    Addison-Wesley Professional
  5. Publication date
    November 30, 2018
  6. Part of series
    Addison-Wesley Signatures (Fowler)
  7. Language
    English
  8. Dimensions
    0.8 x 7.4 x 9.2 inches
  9. Print length
    448 pages
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From the Publisher

Woman Coding at 2 monitors

Refactoring is...

a disciplined way to clean up code that minimizes the chances of introducing bugs. Although it is focused on the code, refactoring has a large impact on the design of systems. It is vital for senior designers and architects, as well as professional programmers, to understand the principles of refactoring and to use them in their projects.

Editorial Reviews

About the Author

Martin Fowler is Chief Scientist at ThoughtWorks. He describes himself as “an author, speaker, consultant and general loud-mouth on software development.” Fowler concentrates on designing enterprise software: exploring what makes a good design and what practices are needed to create one.

Product details

  • Publisher ‏ : ‎ Addison-Wesley Professional
  • Publication date ‏ : ‎ November 30, 2018
  • Edition ‏ : ‎ 2nd
  • Language ‏ : ‎ English
  • Print length ‏ : ‎ 448 pages
  • ISBN-10 ‏ : ‎ 0134757599
  • ISBN-13 ‏ : ‎ 978-0134757599
  • Item Weight ‏ : ‎ 7.4 ounces
  • Dimensions ‏ : ‎ 0.8 x 7.4 x 9.2 inches
  • Part of series ‏ : ‎ Addison-Wesley Signatures (Fowler)
  • Best Sellers Rank: #47,341 in Books (See Top 100 in Books)
  • Customer Reviews:
    4.7 out of 5 stars (1,228)

About the author

Follow authors to get new release updates, plus improved recommendations.
Martin Fowler

Martin Fowler

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For all of my career I've been interested in the design and architecture of software systems, particularly those loosely classed as Enterprise Applications. I firmly believe that poor software design leads to software that is difficult to change in response to growing needs, and encourages buggy software that saps the productivity of computer users everywhere.

I'm always trying to find out what designs are effective, what approaches lead people into trouble, how we can organize our work to do better designs, and how to communicate what I've learned to more people. My books and website are all ways in which I can share what I learn and I'm glad I've found a way to make a living doing this.

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