Ancient vs Modern Programming

gistfile1.js

http://www.codewars.com/kata/51c8991dee245d7ddf00000e/solutions/javascript

"Complete the solution so that it reverses all of the words within the string passed in."

function reverseWords(str){
  //split it into words, store in array
  var words = str.split(" ")
  var output = "";
  //reverse the array and concat each word with space
  for(var i = words.length-1; i >= 0; i--){
      output = output+words[i];
      if(i != 0){
          output = output+" ";
      }
  }
  return output; // reverse those words
}


module ReverseWords where

reverseWords :: String -> String
reverseWords = unwords . reverse . words