Contents

module Atbash

open System

let rec mapMaybe f list = 
    match list with
    | [] -> []
    | x::xs -> 
        match f x with
        | Some(a) -> a :: mapMaybe f xs
        | None -> mapMaybe f xs

let stringFromChars (chars:char seq) = new String(chars |> Array.ofSeq)
let chunksOfSize n xs = 
    xs 
    |> Seq.mapi(fun i x -> i / n, x)
    |> Seq.groupBy fst
    |> Seq.map (fun (_, g) -> Seq.map snd g)

let mapLetter letter = if Char.IsDigit letter then (letter, letter) else (letter, (char)((int)'z' - (int)letter + (int)'a'))
let lettersMap = ['a' .. 'z'] @ ['0'..'9'] |> List.map mapLetter |> Map.ofList

let encodeLetter letter = Map.tryFind (Char.ToLower letter) lettersMap
let encodeInChunks = String.concat " " << Seq.map stringFromChars << chunksOfSize 5
let encodeStr = encodeInChunks << mapMaybe encodeLetter
    
let encode (str:string) = str |> List.ofSeq |> encodeStr

Version data entries

262 entries across 262 versions & 1 rubygems

Version	Path
trackler-2.2.1.44	tracks/fsharp/exercises/atbash-cipher/Example.fs
trackler-2.2.1.43	tracks/fsharp/exercises/atbash-cipher/Example.fs
trackler-2.2.1.42	tracks/fsharp/exercises/atbash-cipher/Example.fs
trackler-2.2.1.41	tracks/fsharp/exercises/atbash-cipher/Example.fs
trackler-2.2.1.40	tracks/fsharp/exercises/atbash-cipher/Example.fs
trackler-2.2.1.39	tracks/fsharp/exercises/atbash-cipher/Example.fs
trackler-2.2.1.38	tracks/fsharp/exercises/atbash-cipher/Example.fs
trackler-2.2.1.37	tracks/fsharp/exercises/atbash-cipher/Example.fs
trackler-2.2.1.36	tracks/fsharp/exercises/atbash-cipher/Example.fs
trackler-2.2.1.35	tracks/fsharp/exercises/atbash-cipher/Example.fs
trackler-2.2.1.34	tracks/fsharp/exercises/atbash-cipher/Example.fs
trackler-2.2.1.33	tracks/fsharp/exercises/atbash-cipher/Example.fs
trackler-2.2.1.32	tracks/fsharp/exercises/atbash-cipher/Example.fs
trackler-2.2.1.31	tracks/fsharp/exercises/atbash-cipher/Example.fs
trackler-2.2.1.30	tracks/fsharp/exercises/atbash-cipher/Example.fs
trackler-2.2.1.29	tracks/fsharp/exercises/atbash-cipher/Example.fs
trackler-2.2.1.28	tracks/fsharp/exercises/atbash-cipher/Example.fs
trackler-2.2.1.27	tracks/fsharp/exercises/atbash-cipher/Example.fs
trackler-2.2.1.26	tracks/fsharp/exercises/atbash-cipher/Example.fs
trackler-2.2.1.25	tracks/fsharp/exercises/atbash-cipher/Example.fs