ocaml sample file for comparison with F#

ocaml_sample_file.ml

module Test = struct
  let hello world = 
    "hello " ^ world
end

let lst =  
  [
    "world";
    "john";
    "BUG";
    "mary"
  ]
  |> List.filter (fun x -> x <> "BUG")
  |> List.map Test.hello 
    
let () =
  lst |> List.iter print_endline;
  
  lst 
  |> List.fold_left (fun acc elem -> elem ^ "," ^ acc) ""
  |> print_endline
  ;