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Learn-Refactor-Measure

"... if I knew this a year ago I would did it better"

 This is a typical reaction when you learn something new and you are automatically applying it on stuff you did in past.

The crucial question is:
Should I go back and make it better or just let it go like it is?

In software engineering it is question about refactoring. Honestly I prefer to do refactoring because I believe that "make things better" is a role of engineering in general.

But on the other hand I am also lazy, older guys are telling me: "do not touch it if it works" and I really need to see a value of such a work.

Therefore I have to somehow measure and visualize source code. This could be done by static code analyze, test coverage and performance tools.

From the results I can Learn if my Refactor really made things Measurable better or not. 

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