test.js

var R = require ('ramda'),
    split   = R.split,
    join    = R.join,
    zip     = R.zip,
    zipWith = R.zipWith,
    head    = R.head,
    last    = R.last,
    map     = R.map,
    compose = R.compose,
    curry   = R.curry,
    apply   = R.apply,
    ap      = R.ap,
    sortBy  = R.sortBy,
    log     = console.log,

    msgs = [
      "programs Manchester The written ran Mark 1952 1 in Autocode from;6 2 1 7 5 3 11 4 8 9",
      "programming to a code machine language automatically used it language, compiler the A convert into;2 8 6 15 14 12 9 5 4 3 7 11 1 10"
    ],
// Pure Code

//  separateEncoding :: String -> [[String], [String]]
    separateEncoding = compose (map (split (' ')), split (';')),

//  convertAndSort :: [[String], [String]] -> [[String], [Integer]]
    convertAndSort = sortBy (compose (parseInt, last)),

//  decode :: String -> String
    decode = compose (
      join (' '),        // Joins into a single string
      map (head),        // Takes the array words
      convertAndSort,    // Takes number, converts to integer, and sorts.
      apply (zip),       // Zips the two lists together
      separateEncoding   // Splits into two arrays on ";". Then splits on each of those arrays by " ".
    ),

    decodeAndJoin = compose (join ("\n"), map (decode));

// Impure Code
log (decodeAndJoin (msgs));

// Outputs:
// The Manchester Mark 1 ran programs written in Autocode 1952
// A programming language, it used a compiler to automatically convert the language machine code

For SO question: http://stackoverflow.com/questions/24453261/pure-functional-javascript-solving-sample-prob/26551083