Which is more functional programming?

I heard about Haskell, is it as much functional programming as JavaScript?

Haskell is fucking beautiful. No language I have ever written code in has come close to the feeling Haskell gives me when I put together something cool.

As for usefulness.. I've written plenty of stuff in Haskell that's quite useful. I wrote a webcrawler. I wrote a file organizer, mainly for my download folder, which uses rules which are literally Haskell syntax for ADTs.

Anyhow.. darcs is in Haskell, fyi. Yesod, happstack, etc etc.