PDF or EBOOK (Working Effectively with Legacy Code) à Michael C. Feathers

Michael C. Feathers ↠ 0 Characters

Working Effectively with Legacy Code

Michael C. Feathers ↠ 0 Characters Working Effectively with Legacy Code Download ↠ 0 Against introducing new problems Techniues 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 techniues that help you work with program elements in isolation and make safer change. The tl dr is that 1 tests make it easier to change and improve code and 2 it can make sense to worsen the code as an intermediate step so you can test and improve the codeNoting that Testing in isolation is an important part of the definition of a unit test Feathers gives a long list of ways to break dependencies for testing Using macros to redefine methods during compilation Substituting in a different behavior for a dependency at link time Passing in objects instead of creating them or accessing a global Moving isolated methods to an abstract superclass that can be subclassed and tested in isolation Accessing objects through getters instead of direct property access and many He also gives some other suggestions that don t have to do with dependencies Using a sensing variable to add tests during a refactoring The variable can be conditionally set in a method so that you can verify that the correct behavior is achieved Extract small pieces first as doing so will often help you see the big picture Programming is the art of doing one thing at a time One pervasive problem in legacy code bases is that there often aren t any layers of abstraction Remember that it is okay to extract methods with poor names or poor structure to get tests in place Safety first After the tests are in place you can make the code much cleaner A unit test that takes 110th of a second to run is a slow unit test Pay attention to private and protected methods If a class has many of them it often indicates that there is another class in the class dying to get out I found many of those viewpoints to be thought provoking I also thought this bit about effects was interestingIn general programming gets easier as we narrow effects in a program We need to know less to understand a piece of code At the extreme we end up with functional programming in languages such as Scheme and Haskell Programs can actually be very easy to understand in those languages but those languages aren t in widespread use Regardless in OO languages restricting effects can make testing much easier and there aren t any hurdles to doing itMany of his techniues involve inheritance which he acknowledges towards the end of the book So I m not sure how many I ll use I m interested in factoring my code to avoid dependencies though I ll definitely be thinking about them in the coming monthsMy key takeaway is probably that tests can be important than the ideal structure if you can t have both

Review Working Effectively with Legacy Code

Michael C. Feathers ↠ 0 Characters Working Effectively with Legacy Code Download ↠ 0 Code bases This book draws on material Michael created for his renowned Object Mentor seminars techniues Michael has used in mentoring to help hundreds of developers technical managers and testers bring their legacy systems under control The topics covered includeUnderstanding 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. I think the entire book can be resumed as Legacy code is a codebase without tests While working in there you must introduce tests before If you cannot introduce test because it is hard andor you have not enough time use some techniues listed in the book that change the code as little as possible or use other techniues that help you write at least some testsI think the majority of techniues are pretty known by developers but we tend not to use them because they sometimes can worsen the production code The book tries to changes our mind saying that sometimes this trade off is valid because the tests can help you improve your code later And I think this is the best contribution of the bookGiven what was said I think the book is a good advisor but could be much succinct

Characters Ö PDF, DOC, TXT or eBook ↠ Michael C. Feathers

Michael C. Feathers ↠ 0 Characters Working Effectively with Legacy Code Download ↠ 0 Get out of your legacy systems 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 uestions 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 effectively with large untested legacy. This book should be considered a reuired companion book to Martin Fowler s Refactoring Refactoring is about slowly and progressively turning ugly code into well designed code I d read Refactoring and tried its techniues but I just couldn t figure out how to make it work for my purposes I knew refactoring was based on having a robust suite of regression tests Let s face it most ugly code lacks such a suite of tests If you want to refactor something and you don t have a test you need to write one But try writing tests for said ugly code Good luck and I ll see you when you ve lost all your hairThat s where this book comes in This I think is what I need to make refactoring work for me Its title is a little deceiving though It s not really about working effectively with legacy code it s about how to make legacy code testable TDD and refactoring take it from there Making legacy code testable is really the tough part and this book does a great job of helping you tame it It can be a messy process A lot of this book feels like hacks But it s way better than the alternative traditional approach which this book calls edit and pray Since this book is geared toward traditional languages C C and Java much of it is about showing you how to overcome the limitations and barriers of these inferior IMO languages Most of these stupid problems don t exist in newer languages But they re still uite good to know Especially important is some of the concepts this book introduces such as sensing separating seams interception points pinch points fakes and mocks Some of the techniues are uite powerful and useful everywhere such as sprouting wrapping scratch refactoring characterization tests and sensing variablesSome of this book is a little hard to follow especially if you don t like or care for C and Java This is partly because he uses actual production code from various projects as his examples While it make it harder to follow this adds a lot realism to the book which you ll appreciate if you re like me and have read many programming books with contrived and unrealistic examplesUnless you have legacy code with a full suite of regression tests very unlikely don t even bother reading Refactoring unless you plan to read this book afterward


10 thoughts on “PDF or EBOOK (Working Effectively with Legacy Code) à Michael C. Feathers

  1. says: Review Working Effectively with Legacy Code Characters Ö PDF, DOC, TXT or eBook ↠ Michael C. Feathers Michael C. Feathers ↠ 0 Characters

    Characters Ö PDF, DOC, TXT or eBook ↠ Michael C. Feathers PDF or EBOOK (Working Effectively with Legacy Code) à Michael C. Feathers We wise programmers know that code should be written to minimize dependencies inject those that are necessary use interfaces be tested from the start etc etc and we always write our new code like that right? but our good habits and wisdom don’t matter when working with legacy code You don’t have the option of going back in tim

  2. says: Review Working Effectively with Legacy Code PDF or EBOOK (Working Effectively with Legacy Code) à Michael C. Feathers Michael C. Feathers ↠ 0 Characters

    PDF or EBOOK (Working Effectively with Legacy Code) à Michael C. Feathers Characters Ö PDF, DOC, TXT or eBook ↠ Michael C. Feathers Review Working Effectively with Legacy Code This book should be considered a reuired co

  3. says: PDF or EBOOK (Working Effectively with Legacy Code) à Michael C. Feathers Review Working Effectively with Legacy Code

    PDF or EBOOK (Working Effectively with Legacy Code) à Michael C. Feathers This has become a Legacy Book unfortunately The title is also misleading It doesn't cover technical debt evolving architecture replacing a dead library or other topics you might expect around the subject of long t

  4. says: PDF or EBOOK (Working Effectively with Legacy Code) à Michael C. Feathers Characters Ö PDF, DOC, TXT or eBook ↠ Michael C. Feathers Review Working Effectively with Legacy Code

    Characters Ö PDF, DOC, TXT or eBook ↠ Michael C. Feathers PDF or EBOOK (Working Effectively with Legacy Code) à Michael C. Feathers This is without uestion one of the essential books on my software development bookshelf The dirty secret of software is that 80% or if it is hacking your way through thick tangles of legacy code This book is your survival guide in that jungle

  5. says: PDF or EBOOK (Working Effectively with Legacy Code) à Michael C. Feathers Characters Ö PDF, DOC, TXT or eBook ↠ Michael C. Feathers Review Working Effectively with Legacy Code

    Michael C. Feathers ↠ 0 Characters PDF or EBOOK (Working Effectively with Legacy Code) à Michael C. Feathers I think the entire book can be resumed as Legacy code is a codebase without tests While working in there you must introduce

  6. says: PDF or EBOOK (Working Effectively with Legacy Code) à Michael C. Feathers

    PDF or EBOOK (Working Effectively with Legacy Code) à Michael C. Feathers I've heard this called genius and it is Legacy code is defined as untested code Changing it involves various strategies to safely and incrementally get tests in place The seam model of thinking where you identify points you can influence beh

  7. says: PDF or EBOOK (Working Effectively with Legacy Code) à Michael C. Feathers

    PDF or EBOOK (Working Effectively with Legacy Code) à Michael C. Feathers 425 great techniues on how to effectively work with legacy codeMost of my highlights and notes were from Chapter 17 My Application Has No Structure eg telling the story of the system a techniue that I'll surely use

  8. says: Michael C. Feathers ↠ 0 Characters Characters Ö PDF, DOC, TXT or eBook ↠ Michael C. Feathers Review Working Effectively with Legacy Code

    PDF or EBOOK (Working Effectively with Legacy Code) à Michael C. Feathers Characters Ö PDF, DOC, TXT or eBook ↠ Michael C. Feathers Review Working Effectively with Legacy Code The tl;dr is that 1 tests make it easier to change and improve code and 2 it can make sense to “worsen” the code as an intermediate step so you can test and improve the codeNoting that “Testing in isolation is an important part of the definition of a unit test” Feathers gives a long list of ways to break dependencies for testing Using macros to redefine methods during compilation Substituting in a different beh

  9. says: Review Working Effectively with Legacy Code Michael C. Feathers ↠ 0 Characters PDF or EBOOK (Working Effectively with Legacy Code) à Michael C. Feathers

    PDF or EBOOK (Working Effectively with Legacy Code) à Michael C. Feathers This book is a must for anyone who wants to master software design It teaches you many techniues and principles to help you on the t

  10. says: Characters Ö PDF, DOC, TXT or eBook ↠ Michael C. Feathers PDF or EBOOK (Working Effectively with Legacy Code) à Michael C. Feathers

    Review Working Effectively with Legacy Code PDF or EBOOK (Working Effectively with Legacy Code) à Michael C. Feathers Michael C. Feathers ↠ 0 Characters For me the 'big idea' of this book was the view that legacy code is any code without sufficient unit tests That makes complete sense to me and is a great way to look at software development So the idea gets 5 st

Leave a Reply

Your email address will not be published. Required fields are marked *