Summary:
The book provides a systematic approach to improving the structure and readability of code without altering its functionality, through a catalog of refactoring techniques. It emphasizes the importance of testing, clear code, and the application of small, controlled transformations to enhance software maintainability and performance.
Key points:
1. Code Smells: These are design flaws, not bugs, that may cause future issues. Examples include duplicate code and large classes.
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