As software developers, we have two hats. One is for adding function and one is for **Refactoring#**. Frequent change of hats are quite common in software development as we want to refine the software to adhere to the system requirements. Just that we need to be aware what hat we’re currently wearing. Refactoring: Improving The Design of Existing Code
When we’re adding function, we don’t change the existing code as we should merely add new capabilities and tests to the software. When we’re refactoring, no new functionalities or tests should be added to the codebase. The code’s internal structure should be the main changing focus when we are in refactoring hat. The only exception for that is when an interface change force a change in test.