Practical Object Oriented Design In Ruby

We would probably be talking, at least, an hour for each step. Tests are your record of the interface of every abstraction and as such they are the wall at your back. Meta-programming might be somewhat harder in static languages. Something that a static language compiler does for you.

Practical object oriented design in ruby

Each technique is illustrated with extended examples, all downloadable from the companion Web site, poodr. Creating Flexible Interfaces has been a joy.

Practical object oriented design in ruby

Want to Read Currently Reading Read. Then in the last chapter it basically re-implements a type system via tests, by checking if a class has certain methods. Evans famous Bounded Contexts come in mind here. She's neither patronizing nor overly complicated when explaining topics, but rather finds a great ba I love the Ruby language and I have loved it pretty much from the first time I found out about it.

Practical object oriented design in ruby

Why do you explicitly say that you do this to make the types visible? Very well written, simple yet very understandable examples, and lots of insights. At the last chapter, Sandi tells us a fresh view about testing, with concepts of inbound message, outbound message. While reading it, I couldn't drop the book for the life of me.

Within a second or two of two of changing code the tools will have detected the change, compiled the code, executed the tests, and notified you if you broke something. Should you happen to read this I would strongly recommend removing the bash-static-typing section in the next edition, or working very hard to make it balanced. She shows you how to build new applications that can survive success and repair existing applications that have become impossible to change. But books like this one are the ones that push you not to stop reading.

Essential reading for anyone looking to improve their skills in building applications in Ruby though the concepts could likely be applied to any dynamically typed language. If you like books and love to build cool products, we may be looking for you. Excellent read, no matter how much experience you have or if you use Ruby or not. Even better a number of the principles explained here are language agnostic, your Python is better Python after reading this.

The big selling point is that Sandi writes from a highly practical point of view. This is the gold standard for practical programming texts. If your object has so many private methods that you dare not leave them untested, consider extracting the methods into a new object. The only thing I didn't like are code examples with real-world objects like Bike, Gear and Mechanic. In my humble opinion, this book's greatest strength lies in its advice to think first not of objects themselves and their responsibilities, anime studio debut 8 mac but as actors and messages passed between them.

Depending on these abstractions reduces risk and increases flexibility, making your application cheaper to maintain and easier to change. Why do you talk time and time and time again about how to make the implicit types visible so that it is possible to understand the code? My brain loves creating connections between concepts, and coming up with abstractions to depict situations, problems and solutions. Than you very much to Sandi Metz for writing it! The further into the book, the worse the code is.

Other books in the series. Well-crafted analogies that really drive the point home. Seeing and defining public interfaces and abstractions has become a lot easier.

Obviously the thinking part is apt to take more, but doing is almost instant. Deleting unused code saves money right now, if you do not do so you must test it. And it is otherwise such a good book!

Very well written, it explains how to manage dependencies, how to implement duck types and how to use inheritance and composition. Just like in a dynamic language.

But seriously, that's the only complaint that I have about it, it is a truly excellent book. The excellent tools support that the ability to do static analysis affords. But our whole code base would be impossible without it.

This book has tangibly and immediately helped me improve as a programmer and increased my chances of advancing in my career by giving me higher levels of knowledge of important concepts in coding. There are a plethora of libraries and frameworks, written in static languages, out there that are based on meta programming.

Even in well written code it is likely that such refactorings are so hard to perform that I will just not do it. The chapters on modules and testing also helped tighten up my thinking on a few topics.

Practical object oriented design in ruby

This of course goes for static languages with the excellent tool support that they afford. The author does a great job of following the development and improvement of a sample app throughout the book an app for a bike shop.

Practical object oriented design in ruby

If there's one thing I would definitely take away from this book, it's from the last part on testing. Single responsibility principle, the law of Demeter, duck typing, inheritance, composition, testing and more.

See a Problem

This book gave me a dose of both Ruby and abstractions that was very soothing. The Web is awash in Ruby code that is now virtually impossible to change or extend. For non Rubyists it makes sense to dive into a minute tutorial just to follow along with the examples. At the same time, that's really an exercise for the reader. Metz writes with extreme clarity, and this is a resource that I will no doubt be revisiting over and over agin.

For an experienced developer, there may be no new concepts in the book, but it is still a good opportunity to refresh your knowledge. Read it through, go write some code, and reread it again in months. Your book is truly not enhanced by a semi-informed attack on static typing. Sandi has a very engaging way of writing, very much like the way she talks at conferences.

The story they tell remains true long after paper documents become obsolete and human memory fails. In my opinion the greatest of these tools are the refactoring tools. She highlights that few rules are black and white and that they can be broken if the benefits outweigh the costs. Open Preview See a Problem? Safest to simply not believe anything said about statically typed languages in this book.