contents

acknowledgments

about the author

about the cover illustration

1 Refactoring refactoring

1.1 What is refactoring?

1.2 Skills: What to refactor?

An example code smell

An example rule

1.3 Culture: When to refactor?

Refactoring in a legacy system

When should you not refactor?

1.4 Tools: How to refactor (safely)

1.5 Tools you need to get started

Programming language: TypeScript

Editor: Visual Studio Code

Version control: Git

1.6 Overarching example: A 2D puzzle game

Practice makes perfect: A second codebase

1.7 A note on real-world software

2 Looking under the hood of refactoring

2.1 Improving readability and maintainability

Making code better

Maintaining code . . . without changing what it does

2.2 Gaining speed, flexibility, and stability

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