OCaml syntax for defining a helper function inside of another function?

Question

I apologize if this is a silly question, but I'm a newbie to OCaml and I wasn't able to find examples of this anywhere. Could somebody give me a simple example of the Ocaml syntax for defining a helper function inside of another function?

Thank you!

Answer 1

Here you go:

let outer x y =
  let inner z = x + z
  in inner y