Fully Revised and Updated–Includes New Refactorings and Code Examples

“Any fool can write code that a computer can understand. Good programmers write code that humans can understand.”
—M. Fowler (1999)

For more than twenty years, experienced programmers worldwide have relied on Martin Fowler’s Refactoring to improve the design of existing code and to enhance software maintainability, as well as to make existing code easier to understand.

This eagerly awaited new edition has been fully updated to reflect crucial changes in the programming landscape. Refactoring, Second Edition, features an updated catalog of refactorings and includes JavaScript code examples, as well as new functional examples that demonstrate refactoring without classes.

Like the original, this edition explains what refactoring is; why you should refactor; how to recognize code that needs refactoring; and how to actually do it successfully, no matter what language you use.

• Understand the process and general principles of refactoring
• Quickly apply useful refactorings to make a program easier to comprehend and change
• Recognize “bad smells” in code that signal opportunities to refactor
• Explore the refactorings, each with explanations, motivation, mechanics, and simple examples
• Build solid tests for your refactorings
• Recognize tradeoffs and obstacles to refactoring

Includes free access to the canonical web edition, with even more refactoring resources. (See inside the book for details about how to access the web edition.)

Martin Fowler is Chief Scientist at ThoughtWorks. He describes himself as “an author, speaker, consultant and general loud-mouth on software development.” Fowler concentrates on designing enterprise software: exploring what makes a good design and what practices are needed to create one.

Preface
1. Refactoring, a First Example
2. Principles in Refactoring
3. Bad Smells in Code
4. Building Tests
5. Toward a Catalog of Refactorings
6. Composing Methods
7. Moving Features between Objects
8. Organizing Data
9. Simplifying Conditional Expressions
10. Making Method Calls Simpler
11. Dealing with Generalization
12. Big Refactorings
13. Refactoring, Reuse, and Reality
14. Refactoring Tools
15. Putting It All Together