Overview

Breathe New Life into Old Code Without Breaking Everything Legacy code doesn't have to be a nightmare. Refactoring Legacy Code gives you a practical roadmap to untangle messy codebases, reduce technical debt, and make your applications maintainable-without rewriting from scratch. Perfect for developers, tech leads, and software architects, this book breaks down real-world strategies for understanding, testing, and improving old code-so you can ship faster, reduce bugs, and boost confidence in every release. Inside You'll Learn: Proven techniques to safely refactor without introducing new bugs Identifying ""code smells"" and patterns that need attention How to write unit tests for untestable legacy code Isolating and improving critical modules Refactoring with confidence using version control and CI/CD Dependency breaking techniques (seams, adapters, and more) Legacy system modernization strategies Step-by-step examples in common programming languages Incremental refactoring in high-pressure, fast-moving teams How to gain stakeholder buy-in for refactoring efforts Stop dreading legacy systems. Start fixing them with clarity, structure, and success. Clean code is a choice. Make it one line at a time.

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