[CharlieDigital]

I think of OOP done well at a high level as "structural logic". Whereas in FP, one might use `map()` and `bind()` to replace complex imperative logic flows, in OOP, this is done with object hierarchies and structures.

When you have a abstract base class or an interface that defines some contract, it's creating a "shape" that defines how an instance of the class can be used.

I think that this might be why some folks have an affinity for OOP and some have an affinity for FP. OOP affinity might be tied to more visual thinkers. For me, I see the "shapes" of the code defined by the contracts.