[RESOLVED] Experimenting with functional programming.

[Peter Swinkels]

I have been experiment with functional programming. I made a function that escaped non-displayable characters in a string and uses string concatenation to create a new string containing the result ("Escaped"):

open System

//This function converts non-displayable characters in the specified text to escape sequences.
let Escape (text: String) = 
   let mutable Escaped = ""

   text.ToCharArray() |> Array.iter(
         fun character -> 
         Escaped <- Escaped +
         match character with
         | character when character = '\t' || character >= ' ' -> character |> string
         | _ -> "/" + String.Format("{0:X}", (character |> byte)).PadLeft(2, '0')
      )

   Escaped

[<EntryPoint>]
let main argv = 
    printfn "%s" (Escape("ASCII character #3: " + ((3 |> char) |> string) + "."))
    0

Using a mutable string is a non-functional approach. Does any one here know how I can make this function so it's completely written in a functional programming style? I'm using F# in Microsoft Visual Studio btw.

EDIT:
I decided the use a StringBuilder object, although I suppose I could a recursive function as well.