Refactoring improves the design of existing code and enhances software maintainability, as well as making existing code easier to understand. Original Agile Manifesto signer and software development thought leader, Martin Fowler, provides a catalog of refactorings that explains why you should refactor; how to recognize code that needs refactoring; and how to actually do it successfully, no matter what language you use.

Refactoring principles: understand the process and general principles of refactoring
Code smells: recognize "bad smells" in code that signal opportunities to refactor
Application improvement: quickly apply useful refactorings to make a program easier to comprehend and change
Building tests: writing good tests increases a programmer's effectiveness
Moving features: an important part of refactoring is moving elements between contexts
Data structures: a collection of refactorings to organize data, an important role in programs
Conditional Logic: use refactorings to make conditional sections easier to understand
APIs: modules and their functions are the building blocks of our software, and APIs are the joints that we use to plug them together
Inheritance: it is both very useful and easy to misuse, and it's often hard to see the misuse until it's in the rear-view mirror---refactorings can fix the misuse
Examples are written in JavaScript, but you shouldn't find it difficult to adapt the refactorings to whatever language you are currently using as they look mostly the same in different languages.

"Whenever you read [*Refactoring], it's time to read it again. And if you haven't read it yet, please do before writing another line of code."* -David Heinemeier Hansson, Creator of Ruby on Rails, Founder & CTO at Basecamp

"Any fool can write code that a computer can understand. Good programmers write code that humans can understand." -M. Fowler (1999)

Autorentext

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.

Klappentext

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.)

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