> OCaml is OO Interestingly, the class system of Ocaml is one of its least useful parts. This is basically because most uses for inheritance (mixins, interfac

> OCaml is OO Interestingly, the class system of Ocaml is one of its least useful parts. This is basically because most uses for inheritance (mixins, interfaces) are covered by first class functions. > However, this is also imperative - we're telling the computer what to do. No we don't (if you except the assignment to even). The fact that "filter" is an active verb is slightly misleading here. It deludes us into thinking the computer does something. (Well, it does, but not in the imperative programming sense of the word.) A more correct name would be "filtered", which makes it clearer that it produces a result, which is a filtered version of its second argument. I we wanted to be pedantic, "filter" should be reserved for a procedure that actually modifies its argument in place. But as there's no such procedure in the standard library of the typical functional language, it doesn't really matter.