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Working Effectively with Legacy Code 1st Edition

4.5 4.5 out of 5 stars 642 ratings

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From the brand


From the Publisher

Programmer holding Working with Legacy Code and a lap top

Must-Read for Every Programmer and Developer

This classic, endorsed by Robert "Uncle Bob" Martin (author of Clean Code), is on many must-read lists for programmers and developers including lists featured on Guru99, DZone, Built In, Dev Community (dev.to), and more.

"The book is important, as almost every developer at some point in career, has to work with a legacy system and it still represents the most challenging problems for many companies. The book goes deep into understanding the general process of a software change like adding features, fixing bugs, optimizing performances, etc."

—Milan Milanovic, DZone, November 2021

Editorial Reviews

From the Back Cover

Get more out of your legacy systems: more performance, functionality, reliability, and manageability

Is your code easy to change? Can you get nearly instantaneous feedback when you do change it? Do you understand it? If the answer to any of these questions is no, you have legacy code, and it is draining time and money away from your development efforts.

In this book, Michael Feathers offers start-to-finish strategies for working more effectively with large, untested legacy code bases. This book draws on material Michael created for his renowned Object Mentor seminars: techniques Michael has used in mentoring to help hundreds of developers, technical managers, and testers bring their legacy systems under control.

The topics covered include

  • Understanding the mechanics of software change: adding features, fixing bugs, improving design, optimizing performance
  • Getting legacy code into a test harness
  • Writing tests that protect you against introducing new problems
  • Techniques that can be used with any language or platform―with examples in Java, C++, C, and C#
  • Accurately identifying where code changes need to be made
  • Coping with legacy systems that aren't object-oriented
  • Handling applications that don't seem to have any structure

This book also includes a catalog of twenty-four dependency-breaking techniques that help you work with program elements in isolation and make safer changes.


© Copyright Pearson Education. All rights reserved.

About the Author

MICHAEL C. FEATHERS works for Object Mentor, Inc., one of the world's top providers of mentoring, skill development, knowledge transfer, and leadership services in software development. He currently provides worldwide training and mentoring in Test-Driven Development (TDD), Refactoring, OO Design, Java, C#, C++, and Extreme Programming (XP). Michael is the original author of CppUnit, a C++ port of the JUnit testing framework, and FitCpp, a C++ port of the FIT integrated-testing framework. A member of ACM and IEEE, he has chaired CodeFest at three OOPSLA conferences.


© Copyright Pearson Education. All rights reserved.

Product details

  • Publisher ‏ : ‎ Pearson; 1st edition (September 22, 2004)
  • Language ‏ : ‎ English
  • Paperback ‏ : ‎ 464 pages
  • ISBN-10 ‏ : ‎ 0131177052
  • ISBN-13 ‏ : ‎ 978-0131177055
  • Item Weight ‏ : ‎ 1.63 pounds
  • Dimensions ‏ : ‎ 7 x 1.2 x 9.25 inches
  • Customer Reviews:
    4.5 4.5 out of 5 stars 642 ratings

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4.5 out of 5 stars
4.5 out of 5
642 global ratings

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Top reviews from the United States

Reviewed in the United States on May 21, 2014
22 people found this helpful
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Reviewed in the United States on October 19, 2009
9 people found this helpful
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Siddharth Kothari
5.0 out of 5 stars Very helpful book
Reviewed in India on July 31, 2023
Avid Reader
5.0 out of 5 stars Excellent
Reviewed in the United Kingdom on December 14, 2016
5 people found this helpful
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Alan Lenton
5.0 out of 5 stars A very useful book
Reviewed in the United Kingdom on September 20, 2008
9 people found this helpful
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James Dobson
5.0 out of 5 stars This book will make you a better programmer.
Reviewed in Canada on November 28, 2016
2 people found this helpful
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Davide B.
4.0 out of 5 stars Must have per software engineering anche se ormai datato
Reviewed in Italy on February 21, 2022
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Davide B.
4.0 out of 5 stars Must have per software engineering anche se ormai datato
Reviewed in Italy on February 21, 2022
Conoscevo da tempo il libro e l' ho comprato perché lo volevo nella collezione dei classici. Unica pecca riguarda la rilegatura che presenta difetti (pagine tagliate male). Forse era rimanenza di magazzino :-(
Il contenuto è ovviamente ottimo, anche se i tools di refactoring odierni lo rendono in qualche parte superato.
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2 people found this helpful
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