While the term usually refers to source code, it can also apply to executable code that no longer runs on a later version of a system, or requires a compatibility layer to do so. In this book, Michael Feathers offers start-to-finish strategies for working more effectively with large, untested legacy code bases. Legacy code is defined as untested code. Even if you are writing a software from scratch, you’ll definitely get to a point where your code will become legacy and difficult to test and to deal with. Introduction. The only cons is that many techniques in this book might be outdated, but you never know when you might need it. “Legacy code. See 2 questions about Working Effectively with Legacy Code…. [1] Michael Feathers[2] introduced a definition of legacy code as code without tests, which reflects the perspective of legacy code being difficult to work with in part due to a lack of automated regression tests. This book definitely improves your programming skills. Having said that, the book is mostly about adding unit tests to code single threaded programs written in statically typed languages. Gain some experience, fight some legacy code, invent some techniques of your own. In conclusion, I mostly I missed techniques around handling dynamically typed languages and thread-safety issues. Michael Feathers, author of _Working Effectively With Legacy Code_ joins Tech Done Right to talk about technical debt, how communication can prevent bad coding practices, why coding problems are never just about code, and what it's like to go around the world seeing the worst code messes ever written. Changing it involves various strategies to safely and incrementally get tests in place. etc., and we always write our new code like that (right? Look at Michael Feathers' presentation: 68 slides; Listen to a podcast interview with Michael Feathers. Dose this book contain example and exercise to test the application and practice? Working Effectively with Legacy Code: WORK EFFECT LEG CODE _p1 - Ebook written by Michael Feathers. In such cases we wonder how to implement our newly learnt unit test skills. This book definitely improves your programming skills. works for Object Mentor, Inc., one of the world's top providers of mentoring, skill development, knowledge transfer, and leadership services in software development. Download for offline reading, highlight, bookmark or take notes while you read Working Effectively with Legacy Code: WORK EFFECT LEG CODE _p1. In C and C++, a macro preprocessor runs before the compiler. As per Working effectively with Legacy Code, by Michael Feathers, 'Legacy code is any code without unit tests'.To refactor, you need unit tests. Gain some experience, fight some legacy code, invent some techniques of your own. Further, IDEs today can automated most of the techniques described in the book. Introduction. Yet, its content doesn’t get outdated. 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. Symbiosis. Michael Feathers (R7K Research & Conveyance) is a luminary, expert in software and organization design, and author of Working Effectively with Legacy Code.Over the past 20 years, he has spoken at conferences around the world, and some even call him the “godfather of legacy code.” A must-read book since most of the software we'll end up working with would be Legacy Code. However, it's still capable enough to teach the old dog new tricks. I hope that my initial thoughts, that Micheal Feathers is backing out from his “Code without tests is bad code” statement, is not 100% accurate. Yes, some of the sections were outdated, but still this book offers a really good glimpse on how to handle work with legacy code. I could solidly say that I learned something after reading this book. 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