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Refactoring is a technique for restructuring existing code without changing its behavior. You can think of refactoring as a series of small code transformations. One change (refactoring) does little. However, a series of refactorings leads to a significant transformation. There is no better way to learn refactoring than to practice. That's why I've prepared a refactoring exercise for you. Today I'm going to refactor poorly written code. And I'll show you 5 great refactoring techniques along the way:
– Extract method
– Extract interface
– Extract class
– Function code
– Push logic down

5 great C# refactoring tips
https://www.milanjovanovic.tech/blog/5-awesome-csharp-refactoring-tips

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Chapter
0:00 Start point
2:52 Refactoring the validation logic
6:15 Refactoring towards dependency injection
8:01 Refactoring the calculation logic
15:57 Completion of refactoring
16:51 Running the tests after refactoring
18:07 A few more points for improvement

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