Web Reference: Fowler draws a clean line between changes to code that do, and those that do not, affect its behavior. He calls those that do not, "refactoring". This is an important distinction, because if we divide our work into refactoring and non-refactoring code modification activities (Fowler calls it "wearing different hats"), we can apply different, goal-appropriate techniques. If we are making a ... In essence when you refactor you are improving the design of the code after it has been written.” - Martin Fowler (Father of Code Smell). An example of a refactoring could be extract method (Figure 1): If a method is too long, it should be decomposed, using this refactoring technique. Refactoring code is a process of cleaning up your code, reducing the clutter and improving the readability without causing any side effects or changes to features. Basically, you refactor by applying a series of code change rules that improve code readability and re-usability, without affecting the logic. Always unit test before and after refactoring to ensure your logic isn't affected.
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