Meeting with programming task in advance

Dear functional programming enthusiasts,

we thought it would be the time to have our first fun-club session this year, so next fun-club is

February, 28th, 2013 - 19:30
SoundCloud
Rosenthaler Strasse 13
10119 Berlin

This time we would like to give a little task in advance. The task described below is quite simple, but still going beyond the toy examples we had 2 sessions ago. We would like to see at least 5 volunteers who solve the task and present and discuss their solution at the next meeting (each in a different language if possible).

We'd be happy to have solutions in (at least) these languages:

• JavaScript
• Haskell
• Erlang
• LISP or a LISP dialect (Clojure anyone?)
• Scala or F#
• optional: a shell one-liner just with GNU tools and pipes

Write email to Lars (lars@nyantec.com) with the languages you offer to do and state which you'd be most happy with. He'll try to arrange that we get a selection that everyone is happy with.
Also write him if you find some problems with the task that you think everyone else should also know about.

All the best,
your fun-club organisers

tl'dr: here is the task: