This is an important point. When done well, in FP the data "disappears", i.e. the types control flow and the functions talk about what you're doing. So there's

This is an important point. When done well, in FP the data "disappears", i.e. the types control flow and the functions talk about what you're doing. So there's no "find me what I c an do with this object" instead it's "What am I returning?" It sounds the same but it isn't. Yes, way in the heart of a functional program there's some code sorting lists of ints or something. But by that time, it's all labeled to the point where the functions just tell you what happens. As someone browsing the source, the nouns disappear.