Second-edition update of Robert C. Martin’s classic handbook on writing maintainable code, with refreshed case studies, smell catalogs, and refactoring practices for modern teams.

The new second edition is still the book I hand to new engineers. I reread it while untangling a decade-old service and the refreshed chapters on functions, naming, and error handling mapped directly onto the code reviews we run today. The added case studies and refactoring walkthroughs make it even easier to pair chapters with exercises; I watched juniors internalize the habits while we rewrote gnarly TypeScript modules. Examples remain Java-forward, but the principles translate cleanly to Go, Rust, or Python, and the new sidebars call out language-agnostic patterns. A few legacy idioms show their age, yet the discipline and smell catalog remain timeless.

Robert C. Martin's second edition refreshes the classic guide to maintainable code. Updated case studies and refactoring walkthroughs for modern teams.

Clean Code: Handbook of Agile Software Craftsmanship

Clean Code: A Handbook of Agile Software Craftsmanship

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