Removing duplication from the code is a seemingly easy task. In many cases it is pretty straight-forward – you look at similar bits of code and you move them to a common method or class that is reusable in other places. Right? No, not really. It is true that code that looks similar might be an indicator that there’s a duplication but it’s not the definitive way of determining the smell.

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If we look for duplication in our code we should look for duplicated concepts instead of similarly looking lines of code.