CODEWITHSUNDEEP
ocaml
ButtahNBred
ButtahNBred

Reputation: 470

Ocaml nested functions

Can someone explain the syntax used for when you have nested functions?

For example I have a outer and an inner recursive function.

let rec func1 list = match list with
[] -> []
|(head::tail) ->
let rec func2 list2 = match list2 with
...
;;

I have spent all day trying to figure this out and I'm getting a ever tiring "Syntax error".

Upvotes: 2

Views: 12219

Answers (1)

Jeffrey Scofield
Jeffrey Scofield

Reputation: 66808

You don't show enough code for the error to be obvious.

Here is a working example:

# let f x =
      let g y = y * 5 in
      g (x + 1);;
val f : int -> int = <fun>
# f 14;;
- : int = 75

Update

Something that might help until you're used to OCaml syntax is to use lots of extra parentheses:

let rec f y x =
    match x with
    | h :: t -> (
        let incr v = if h = y then 1 + v else v in
        incr (f y t)
    )
    | _ -> (
        0
    )

It's particularly hard to nest one match inside another without doing this sort of thing. This may be your actual problem rather than nested functions.

Upvotes: 4

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