What Is Refactoring?
Refactoring is the process of changing a software system in such a way that it does not alter the
external behavior of the code yet improves its internal structure. It is a disciplined way to clean up
code that minimizes the chances of introducing bugs. In essence when you refactor you are
improving the design of the code after it has been written.
from Refactoring: Improving the Design of Existing Code
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