Summary:
The book provides strategies for improving and refactoring legacy codebases, focusing on techniques to identify change points, add tests, and incrementally improve the structure and design of existing code. It emphasizes the importance of testing in understanding and safely altering legacy systems, offering practical advice for dealing with large codebases and complex dependencies.
Key points:
1. Legacy Code: The book defines legacy code as untested code. It emphasizes understanding the code before making changes to avoid new bugs.
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