Commits

camlspotter committed 5dacc68

added some more files to seq

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Files changed (2)

   | lazy Null -> false
   | lazy (Cons (v, t)) -> if k = v then true else mem k t
 
+let concat tss = lazy (match tss with
+  | lazy Null -> Null
+  | lazy (Cons (ts,tss)) -> !! (append ts (concat tss)))
 
+let singleton v = cons v null
 
-  
+let filter p xs = fold_right (fun x st -> if p x then cons x st else st) xs null
 
-
+let rec take n xs = lazy (
+  if n <= 0 then Null
+  else match xs with
+  | lazy Null -> Null
+  | lazy (Cons (x,xs)) -> Cons (x, take (n-1) xs)
+)
 
 val mem : 'a -> 'a t -> bool
 
+val concat : 'a t t -> 'a t
+val singleton : 'a -> 'a t
+val filter : ('a -> bool) -> 'a t -> 'a t
+val take : int -> 'a t -> 'a t
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