Discussion on: Daily Challenge #179 - Hide Phone Numbers

encryptDigit : Char -> Char
encryptDigit character =
    if Char.isDigit character then
        'X'

    else
        character


encryptNum : String -> String
encryptNum string =
    String.map encryptDigit ( String.dropLeft 5 string )
        |> String.append ( String.left 5 string )