Question

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How to have two methods calling each other?

I need to write 2 functions that call each other.
(with conditions inside – so they’d eventually stop)

let x () : int =
   ...
   if (------) then
     y num
   ...


let y () : int =
   ...
   if (------) then
     x num
   ...

The problem is that, as I understand it, F# evaluates functions by order of appearance.. so writing this will create compilation errors…

Is there a way to solve this problem?
So both functions will know each other?

Answer 1

You need the and keyword for mutually-recursive functions:

let rec x num =
   ...
   if (------) then
     y num
   ...

and y num =
   ...
   if (------) then
     x num
   ...