kunishi

fun reverse(nil) = nil
  | reverse(x::xs) = reverse(xs)@[x];
fun revrev(nil) = nil
  | revrev(x::xs) = revrev(xs)@[reverse(x)];

kunishi

fun reverse L = 
    let
      fun rev1 nil L = L
       |  rev1 (x::xs) L = rev1 xs (x::L)
    in
      rev1 L nil
    end;

kunishi

fun reverse(nil) = nil
  | reverse(x::xs) = reverse(xs) @ [x];

kunishi

fun reverse(nil) = nil
|   reverse(x::xs) = reverse(xs) @ [x];

kunishi

fun replaceZero(L) = 
    map(fn n => if n<0 then 0 else n, L);

kunishi

fun removex n nil = nil
 |  removex n (x::xs) = 
    (if n=x then (fn y => y)
            else (fn y => (x::y))) (removex n xs);

kunishi

fun removeeven(nil) = nil
  | removeeven(x::xs) =
    if x mod 2 = 0
	then removeeven(xs)
    else x::removeeven(xs);

kunishi

fun remove_second(L) = 
  if List.length(L) < 2 then nil else hd(L) :: tl(tl(L));

kunishi

exception EmptyList;
fun reduce(F, nil) = raise EmptyList
  | reduce(F, [a]) = a
  | reduce(F, x::xs) = F(x, reduce(F, xs));

kunishi

fun proportional(x, i) =
    if i=0
	then 1
	else x * proportional(x, i-1)