I just had a case of this last week in a web-app I’m writing. In the frontend code I decided to use an abstraction and parametrization in the backend code I ke

I just had a case of this last week in a web-app I’m writing. In the frontend code I decided to use an abstraction and parametrization in the backend code I kept the logic separated. It really depends on context. Specifically on the layer you are operating on.