Add Longest Word in OCaml (#6054)

Author: alope107

archive/o/ocaml/longest-word.ml

@@ -0,0 +1,23 @@
+(* Use custom function instead of Char.Ascii.is_white because the builtin also matches 
+   on vertical tab and form feed which are not considered whitespace for the 
+   purposes of this problem *)
+let is_whitespace = function ' ' | '\t' | '\n' | '\r' -> true | _ -> false
+
+let longest_word_len s =
+  let best, _ =
+    String.fold_left
+      (fun (best, curr) c ->
+        if is_whitespace c then (best, 0)
+        else
+          let curr = curr + 1 in
+          (Int.max best curr, curr))
+      (0, 0) s
+  in
+  best
+
+let () =
+  print_endline
+  @@
+  match Sys.argv with
+  | [| _; s |] when s <> "" -> string_of_int (longest_word_len s)
+  | _ -> "Usage: please provide a string"