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Thisbookintroducesthetheoryandpracticeofpattern-directedrefactorings:sequencesoflow-levelrefactoringsthatallowdesignerstosafelymovedesignsto,towards,o

Refactoringisaboutimprovingthedesignofexistingcode.Itistheprocessofchangingasoftwaresysteminsuchawaythatitdoesnotaltertheexternalbehaviorofthecode,yet