Hello,

 

    I'm sorry this is a very elementary question (but I am pulling my hair out). With a function written in ML:

 

fun filter_list P []       = [] |
    filter_list P (h :: t) = let val ft = filter_list P t
                             in if P h then (h :: ft)
                                else ft
                             end;

 

OR

 

fun member (e, nil) = false |
    member (e , (h :: t)) = if (e=h) then true
                                     else member (e, t) ;

What is the preferred way to write in OCaml using pattern matching on parms??

 

Regards, Vasili