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Practical Object-Oriented Design in Ruby: An Agile Primer (Addison-Wesley Professional Ruby), by Sandi Metz
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The Complete Guide to Writing More Maintainable, Manageable, Pleasing, and Powerful Ruby Applications
Ruby’s widely admired ease of use has a downside: Too many Ruby and Rails applications have been created without concern for their long-term maintenance or evolution. The Web is awash in Ruby code that is now virtually impossible to change or extend. This text helps you solve that problem by using powerful real-world object-oriented design techniques, which it thoroughly explains using simple and practical Ruby examples.
Sandi Metz has distilled a lifetime of conversations and presentations about object-oriented design into a set of Ruby-focused practices for crafting manageable, extensible, and pleasing code. She shows you how to build new applications that can survive success and repair existing applications that have become impossible to change. Each technique is illustrated with extended examples, all downloadable from the companion Web site, poodr.info.
The first title to focus squarely on object-oriented Ruby application design, Practical Object-Oriented Design in Ruby will guide you to superior outcomes, whatever your previous Ruby experience. Novice Ruby programmers will find specific rules to live by; intermediate Ruby programmers will find valuable principles they can flexibly interpret and apply; and advanced Ruby programmers will find a common language they can use to lead development and guide their colleagues.
This guide will help you
- Understand how object-oriented programming can help you craft Ruby code that is easier to maintain and upgrade
- Decide what belongs in a single Ruby class
- Avoid entangling objects that should be kept separate
- Define flexible interfaces among objects
- Reduce programming overhead costs with duck typing
- Successfully apply inheritance
- Build objects via composition
- Design cost-effective tests
- Solve common problems associated with poorly designed Ruby code
- Sales Rank: #47901 in Books
- Brand: Brand: Addison-Wesley Professional
- Published on: 2012-09-15
- Original language: English
- Number of items: 1
- Dimensions: 9.00" h x .70" w x 6.90" l, 1.12 pounds
- Binding: Paperback
- 272 pages
- Used Book in Good Condition
Review
“This is great stuff! Your descriptions are so vibrant and vivid that I’m rediscovering the truth buried in OO principles that are otherwise so internalized that I forget to explore them. Your thoughts on design and knowing the future are especially eloquent.”
—Ian McFarland, President, New Context, Inc.
“As a self-taught programmer, this was an extremely helpful dive into some OOP concepts that I could definitely stand to become better acquainted with! And, I’m not alone: there’s a sign posted at work that reads, ‘WWSMD? – What Would Sandi Metz Do?’”
—Jonathan Mukai, Pivotal in NYC
“Meticulously pragmatic and exquisitely articulate, Practical Object Oriented Design in Ruby makes otherwise elusive knowledge available to an audience which desperately needs it. The prescriptions are appropriate both as rules for novices and as guidelines for experienced professionals.”
—Katrina Owen, developer, Bengler
“I do believe this will be the most important Ruby book of 2012. Not only is the book 100% on-point, Sandi has an easy writing style with lots of great analogies that drive every point home.”
—Avdi Grimm, Author of Exceptional Ruby and Objects on Rails
“While Ruby is an object-oriented language, little time is spent in the documentation on what OO truly means or how it should direct the way we build programs. Here Metz brings it to the fore, covering most of the key principles of OO development and design in an engaging, easy-to-understand manner. This is a must for any respectable Ruby bookshelf.”
–Peter Cooper, editor, Ruby Weekly
“So good, I couldn’t put it down! This is a must-read for anyone wanting to do object-oriented programming in any language, not to mention it has completely changed the way I approach testing.”
–Charles Max Wood, video and audio show host, TeachMeToCode.com
“Distilling scary OO design practices with clear-cut examples and explanations makes this a book or novices and experts alike. It is well worth the study by anyone interested in OO design being done right and ‘light.’ I thoroughly enjoyed this book.”
–Manuel Pais, editor, InfoQ.com
“If you call yourself a Ruby programmer, you should read this book. It’s jam-packed with great nuggets of practical advice and coding techniques that you can start applying immediately in your projects.”
–Ylan Segal, San Diego Ruby User Group
“This is the best OO book I’ve ever read. It’s short, sweet, but potent. It slowly moves from simple techniques to more advanced, each example improving on the last. The ideas it presents are useful not just in Ruby but in static languages like C# too. Highly recommended!”
–Kevin Berridge, software engineering manager, Pointe Blank Solutions, and organizer, Burning River Developers Meetup
“The book is just perfect! The elegance of Ruby shines but it also works as an A to Z of object-oriented programming in general.”
–Emil Rondahl, C# & .NET consultant
“This is an exceptional Ruby book, in which Metz offers a practical look at writing maintainable, clean, idiomatic code in Ruby. Absolutely fantastic, recommended for my Ruby hacker friends.”
–Zachary “Zee” Spencer, freelancer & coach
“This is the best programming book I’ve read in ages. Sandi talks about basic principles, but these are things we’re probably still doing wrong and she shows us why and how. The book has the perfect mix of code, diagrams, and words. I can’t recommend it enough and if you’re serious about being a better programmer, you’ll read it and agree.
–Derick Hitchcock, senior developer, SciMed Solutions
“I predict this will become a classic. I have an uncomfortable familiarity with programming literature, and this book is on a completely different level. I am astonished when I find a book that offers new insights and ideas, and even more surprised when it can do so, not just once, but throughout the pages. This book is excellently written, well-organized, with lucid explanations of technical programming concepts.”
–Han S. Kang, software engineer and member of the LA Rubyists
“You should read this book if you write software for a living. The future developers who inherit your code will thank you.”
–Jose Fernandez, senior software engineer at New Relic
“Metz’s take on the subject is rooted strongly in theory, but the explanation always stays grounded in real world concerns, which helped me to internalize it. The book is clear and concise, yet achieves a tone that is more friendly than terse.”
–Alex Strasheim, network administrator, Ensemble Travel Group
“This is an amazing book about just how to do object-oriented thinking when you’re programming in Ruby. Although there are some chapters that are more Ruby-specific, this book could be a great resource for developers in any language. All in all, I can’t recommend this book enough.”
–James Hwang, thriceprime.com
“Whether you’re just getting started in your software development career, or you’ve been coding for years (like I have), it’s likely that you’ll learn a lot from Ms. Metz’s book. She does a fantastic job of explaining the whys of well-designed software along with the hows.”
–Gabe Hollombe, software craftsman, avantbard.com
“In short, this is in my top five programming books I’ve ever read. I believe that in twenty years this will be considered one of the definitive works on object-oriented programming. I plan to re-read it at least once a year to keep my skills from falling into atrophy. If you’re a relatively new, intermediate, or even somewhat advanced OO developer in any language, purchasing this book is the best way I know to level up your OO design skills.”
–Brandon Hays, freelance software developer
About the Author
Sandi Metz has thirty years of experience working on projects that survived to grow and change. She now writes code every day as a software architect at Duke University, where her team solves real problems for customers who have large object-oriented applications that have been evolving for more than fifteen years. She has spoken at Ruby Nation and speaks regularly at the Gotham Ruby Users Conference.
Most helpful customer reviews
46 of 48 people found the following review helpful.
Superb content, excellent delivery.
By Amazon Customer
This is my favorite tech read so far this year. It takes a straight-forward approach to writing code that you won't hate yourself for a day or month or year later.
The term "design" in the title is not referring to making wild speculative guesses about the future and planning for any number of contingencies, it is about arranging the code so that it is understandable, and to minimize cost and pain.
There is a focus on designing the communication between objects as much as focusing on the structure of the objects themselves, which I found to be extremely interesting. This discussion helped clarify a lot of thoughts and ideas about abstractions and where responsibilities belong, as well as the directions of dependencies -- things that had been rattling around in my brain for a while but that I had trouble applying in the real world. Reading this let me put all these pieces together (and then some) into a coherent whole. Or at least a coherent seed of a whole.
The code examples are simple, but the author manages to wrangle some serious dramatic tension out of every line of code, and they illustrate the concepts covered well enough that I was able to make the leap to applying the concepts in much more complex code bases.
The chapter on testing was sublime. It took an immensely practical approach to which methods to test and which tests to write in order to avoid duplication and brittleness in both tests and designs.
I also appreciated that none of the discussions were about any sort of moral superiority. The discussions were about getting things done. The argument for arranging code nicely wasn't about aesthetics or professional duty, but rather about lowering cost and allowing you to make changes without causing expensive outages and making people frustrated.
Soap boxes? Sure. High horses? Nowhere in sight.
Note: I read a pre-release version of the book. I did not know the author at the time, but sent her quite a lot of feedback, which led to several conversations to clarify. When I waxed enthusiastic about the contents, she asked if she could forward this to the publisher, and a quote ended up in the paper copy.
19 of 20 people found the following review helpful.
Practical Object Oriented Design is Excellent
By Joel Hooks
I have been absolutely enjoying every page. It isn't very often that a technical book comes along that really strikes me as a "new classic," but this one qualifies. Sandi Metz has compiled a concise review of SOLID design principles in clear approachable language.
Don't be put off by the "in Ruby" portion of the title. If you can read code and understand the basics of design patterns, this book shouldn't pose any technical hurdles regarding the language the author uses.
One of my favorite features of this book was the way she guides us through the anti-patterns that we typically see in our code. We then step through a series of refactorings before arriving at a simple, maintainable, nicely packaged object-oriented design.
After we've been well schooled in fundamentals, we are given an excellent exposition of unit testing. The unit testing chapter is worth the cost of admission alone.
This is where we want to go after grasping design patterns. It is earning a well deserved spot next to Growing Object-Oriented Software, Guided by Tests in my top ten list.
17 of 19 people found the following review helpful.
Delightful, important, must-read for intermediate OO devs
By Brandon M Hays
In short, this is in my top five programming books I've ever read. Please do not hesitate, do everyone that works with your code (especially yourself) a favor and read it.
I believe that in 20 years, this will be considered one of the definitive works on Object-Oriented Programming. The author provides a smooth on-ramp from basic OO programming principles, and builds on it until you're able to understand the kinds of lessons that normally only come from decades of day-in, day-out experience working in OO code.
What's unusual about this book?
- It reads your mind.
The author takes enormous care to empathize with the reader. Many times, you'll find yourself reading and thinking something, only to read "you're probably thinking at this point..." with your exact thought or concern.
- The author is okay with sounding like a human being.
The author's colloquial style peeks through over and over again. I kept getting caught off guard by delightful little turns of phrase that one does not see often in programming books.
- The lessons are grounded in reality.
Since Ms. Metz keeps the examples surprisingly close to production code (though a somewhat simplified version), you don't have to reach very far to figure out how you'd apply these lessons. Examples aren't contrived to prove a point, they are real-life situations that demand a solution, which always seems to be presented at just the right time. While reading, you'll find yourself exclaiming when she pinpoints the exact source of pain that you run into frequently.
- Sections end, rather than begin, with a principle.
This is the first book about Object-Oriented design I've read that doesn't clobber you over the head with jargon or come in with a top-down approach. Most technical books start with an assertion, pattern, or hypothesis, then spend the rest of the book explaining and trying to convince you. Ms. Metz takes the longer, more difficult approach of organically working through a typical Object-Oriented application, growing it, feeling pain, and addressing that pain. Along the way, she points out where these pain points are addressed, and only then does she explain that there is a name for the solution,
- It is immediately beneficial.
For my part, I couldn't wait to go back and apply all the lessons I learned to code that I'd written that I wasn't happy with and couldn't figure out why. I've used the lessons from this book to help guide my intuition about the kind of code that lends itself to long-term maintainability.
- It contains no religious zealotry.
There's no preachiness: it's all about strategies, tactics, and tradeoffs a software developer employs to reach a desired goal. It also has the most concise and articulate overview of testing styles I've ever seen. Many programming books lose the forest for the trees, focusing on a pattern, principle, tool, or technique, touting it as *the* solution to all your programming problems. Ms. Metz never falls into that trap, and keeps the focus on writing code that can meet the changing needs of users for years to come.
- It is timeless.
Rather than a trendy new topic, this book could find itself applicable 25 years ago or 25 years from now. I believe it'll be regarded as a landmark volume on the topic of OO design, along with books like Kent Beck's Smalltalk Best Practice Patterns. It's obvious that lots of care, attention, and refinement went into this book, and the reader benefits greatly. I'm grateful to Sandy for writing this book, I plan to re-read it at least once a year to keep my OO skills from falling into atrophy.
I wish I could provide some negative feedback to balance the review, but I simply don't have any. If you're a relatively new, intermediate, or even somewhat advanced OO developer in any langauge, purchasing this book is the best way I know to level up your Object-Oriented design skills.
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