To me, functional programming's advantage comes from avoiding reasoning about state. Everything else is gravy. Beyond that, it's very easy to go down a rabbit

To me, functional programming's advantage comes from avoiding reasoning about state. Everything else is gravy. Beyond that, it's very easy to go down a rabbit hole of terminology. Javascript programmers write functors all the time, but I don't know if I've ever seen the word "functor" written in a JS context by anyone other than raganwald. They're just functions, and the fact that they return functions is damn useful.