Changing code without changing behaviour is refactoring
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Code refactoring is the process of restructuring existing computer code—changing the factoring—without changing its external behavior. Refactoring is intended to improve nonfunctional attributes of the software.
function of 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." -- Martin Fowler in Refactoring Improving The Design Of Existing Code.
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