Trello Node.js Developer Challenge - https://trello.com/jobs/developer

hash.coffee

letters = "acdegilmnoprstuw"

hash = (s) ->
    h = 7
    for l in s
        h = (h * 37 + letters.indexOf(l))
    h

rhash = (h) ->
    return rhash((h - (h % 37)) / 37) + letters[h % 37] if h > letters.length
    return ""

s = "leepadg"
console.log hash(s)
console.log rhash(hash(s))