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<article>
<h2>OCaml mode</h2>
<textarea id="ocamlCode"> (* Summing a list of integers *) let rec sum xs = match xs with | [] -> 0 | x :: xs' -> x + sum xs' (* Quicksort *) let rec qsort = function | [] -> [] | pivot :: rest -> let is_less x = x < pivot in let left, right = List.partition
is_less rest in qsort left @ [pivot] @ qsort right (* Fibonacci Sequence *) let rec fib_aux n a b = match n with | 0 -> a | _ -> fib_aux (n - 1) (a + b) a let fib n = fib_aux n 0 1 (* Birthday paradox *) let year_size = 365. let rec birthday_paradox
prob people = let prob' = (year_size -. float people) /. year_size *. prob in if prob' < 0.5 then Printf.printf "answer = %d\n" (people+1) else birthday_paradox prob' (people+1) ;; birthday_paradox 1.0 1 (* Church numerals *) let zero f x =
x let succ n f x = f (n f x) let one = succ zero let two = succ (succ zero) let add n1 n2 f x = n1 f (n2 f x) let to_string n = n (fun k -> "S" ^ k) "0" let _ = to_string (add (succ two) two) (* Elementary functions *) let square x = x * x;;
let rec fact x = if x <= 1 then 1 else x * fact (x - 1);; (* Automatic memory management *) let l = 1 :: 2 :: 3 :: [];; [1; 2; 3];; 5 :: l;; (* Polymorphism: sorting lists *) let rec sort = function | [] -> [] | x :: l -> insert x (sort
l) and insert elem = function | [] -> [elem] | x :: l -> if elem < x then elem :: x :: l else x :: insert elem l;; (* Imperative features *) let add_polynom p1 p2 = let n1 = Array.length p1 and n2 = Array.length p2 in let result = Array.create
(max n1 n2) 0 in for i = 0 to n1 - 1 do result.(i) <- p1.(i) done; for i = 0 to n2 - 1 do result.(i) <- result.(i) + p2.(i) done; result;; add_polynom [| 1; 2 |] [| 1; 2; 3 |];; (* We may redefine fact using a reference cell and a for loop
*) let fact n = let result = ref 1 in for i = 2 to n do result := i * !result done; !result;; fact 5;; (* Triangle (graphics) *) let () = ignore( Glut.init Sys.argv ); Glut.initDisplayMode ~double_buffer:true (); ignore (Glut.createWindow ~title:"OpenGL
Demo"); let angle t = 10. *. t *. t in let render () = GlClear.clear [ `color ]; GlMat.load_identity (); GlMat.rotate ~angle: (angle (Sys.time ())) ~z:1. (); GlDraw.begins `triangles; List.iter GlDraw.vertex2 [-1., -1.; 0., 1.; 1., -1.]; GlDraw.ends
(); Glut.swapBuffers () in GlMat.mode `modelview; Glut.displayFunc ~cb:render; Glut.idleFunc ~cb:(Some Glut.postRedisplay); Glut.mainLoop () (* A Hundred Lines of Caml - http://caml.inria.fr/about/taste.en.html *) (* OCaml page on Wikipedia -
http://en.wikipedia.org/wiki/OCaml *) </textarea>
<h2>F# mode</h2>
<textarea id="fsharpCode"> module CodeMirror.FSharp let rec fib = function | 0 -> 0 | 1 -> 1 | n -> fib (n - 1) + fib (n - 2) type Point = { x : int y : int } type Color = | Red | Green | Blue [0 .. 10] |> List.map ((+) 2) |> List.fold (fun x y -> x + y) 0 |> printf "%i" </textarea>
<script>
var ocamlEditor = CodeMirror.fromTextArea(document.getElementById('ocamlCode'),
{
mode: 'text/x-ocaml',
lineNumbers: true,
matchBrackets: true
});
var fsharpEditor = CodeMirror.fromTextArea(document.getElementById('fsharpCode'),
{
mode: 'text/x-fsharp',
lineNumbers: true,
matchBrackets: true
});
</script>
<p>
<strong>MIME types defined:</strong> <code>text/x-ocaml</code> (OCaml) and <code>text/x-fsharp</code> (F#).</p>
</article>