By Sandi Metz

ISBN-10: 0321721330

ISBN-13: 9780321721334

Ruby’s largely sought after ease of use has a draw back: Too many Ruby and Rails purposes were created with no drawback for his or her long term upkeep or evolution. the internet is awash in Ruby code that's now almost most unlikely to alter or expand. this article is helping you clear up that challenge by utilizing strong real-world object-oriented layout thoughts, which it completely explains utilizing uncomplicated and functional Ruby examples

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Extra info for Practical Object-Oriented Design in Ruby: An Agile Primer (Addison-Wesley Professional Ruby Series)

Example text

Just as every string object is a data-specific instance of the String class, every class object (String, Fixnum, ad infinitum) is a dataspecific instance of the Class class. The String class manufactures new strings, the Class class manufactures new classes. OO languages are thus open-ended. They don’t limit you to a small set of built-in types and pre-predefined operations; you can invent brand new types of your own. Each OO application gradually becomes a unique programming language that is specifically tailored to your domain.

They are needed, not because the design is clear, but because it isn’t. You do not have to know where you’re going to use good design practices to get there. Good practices reveal design. This simple refactoring makes the problem obvious. Gear is definitely responsible for calculating gear_inches but Gear should not be calculating wheel diameter. Writing Code That Embraces Change 31 The impact of a single refactoring like this is small, but the cumulative effect of this coding style is huge. Methods that have a single responsibility confer the following benefits: • Expose previously hidden qualities Refactoring a class so that all of its methods have a single responsibility has a clarifying effect on the class.

An application that is easy to change is like a box of building blocks; you can select just the pieces you need and assemble them in unanticipated ways. A class that has more than one responsibility is difficult to reuse. The various responsibilities are likely thoroughly entangled within the class. If you want to reuse some (but not all) of its behavior, it is impossible to get at only the parts you need. You are faced with two options and neither is particularly appealing. If the responsibilities are so coupled that you cannot use just the behavior you need, you could duplicate the code of interest.

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Practical Object-Oriented Design in Ruby: An Agile Primer (Addison-Wesley Professional Ruby Series) by Sandi Metz

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