Refactoring - Jay Fields

The Definitive Refactoring Guide, Fully Revamped for Ruby

With refactoring, programmers can transform even the most chaotic software into well-designed systems that are far easier to evolve and maintain. What's more, they can do it one step at a time, through a series of simple, proven steps. Now, there's an authoritative and extensively updated version of Martin Fowler's classic refactoring book that utilizes Ruby examples and idioms throughout-not code adapted from Java or any other environment.

The authors introduce a detailed catalog of more than 70 proven Ruby refactorings, with specific guidance on when to apply each of them, step-by-step instructions for using them, and example code illustrating how they work. Many of the authors' refactorings use powerful Ruby-specific features, and all code samples are available for download.

Leveraging Fowler's original concepts, the authors show how to perform refactoring in a controlled, efficient, incremental manner, so you methodically improve your code's structure without introducing new bugs. Whatever your role in writing or maintaining Ruby code, this book will be an indispensable resource.

This book will help you

Understand the core principles of refactoring and the reasons for doing it

Recognize "bad smells" in your Ruby code

Rework bad designs into well-designed code, one step at a time

Build tests to make sure your refactorings work properly

Understand the challenges of refactoring and how they can be overcome

Compose methods to package code properly

Move features between objects to place responsibilities where they fit best

Organize data to make it easier to work with

Simplify conditional expressions and make more effective use of polymorphism

Create interfaces that are easier to understand and use

Generalize more effectively

Perform larger refactorings that transform entire software systems and may take months or years

Successfully refactor Ruby on Rails code