I think what I would need mostly is: - dependency inversion, try to push decision as later as possible by using this technique + interfaces - separate pure func

I think what I would need mostly is: - dependency inversion, try to push decision as later as possible by using this technique + interfaces - separate pure functions vs side effects functions - static typing that can help me with structs and interfaces with optional value It ends up with a lot of typing but I think it is worth the trouble. Down the road it is easier to maintain and it already saves you time anyway.