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Learn to write clean Ruby code that your team will thank you for. This fully revised and expanded edition goes far beyond the basics to help you master the principles and practices to keep your Ruby code elegant, maintable, and future-proof.

Author Carleton DiLeo draws on years of experience across diverse Ruby codebases to show you why clean code matters and how to achieve it using today's best practices. You'll learn foundational principles like SOLID, DRY, and KISS, explore modern Ruby idioms such as pattern matching and safe navigation, and discover strategies for refactoring, error handling, and performance tuning.

Unlike books that only tell you how to write Ruby, this edition explains why these choices matter, and how they impact readability, scalability, and team productivity. With new chapters on metaprogramming, design patterns, sustainable development practices, and benchmarking tools, this book equips you to write Ruby code that stands the test of time.

You Will:

• Apply core principles (SOLID, DRY, YAGNI, KISS) to real-world Ruby code
• Use modern Ruby features: pattern matching, safe navigation, keyword arguments
• Create cleaner classes and methods with practical examples
• Refactor confidently with tests-first strategies
• Handle errors responsibly with domain-specific exceptions
• Implement design patterns in Ruby and avoid common pitfalls
• Improve performance using benchmarking and profiling tools
• Build sustainable practices: linters, CI, code reviews

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