I think it's great to have more choices of purely functional, statically typed languages for web programming. The only other options I'm aware of are GHCjs and

I think it's great to have more choices of purely functional, statically typed languages for web programming. The only other options I'm aware of are GHCjs and Haste (huge runtime size, incomprehensible code, laziness), and PureScript. PureScript to me seems like the ideal choice of the options available, with a more powerful type system and more of a general-purpose approach. But it doesn't have Elm's tooling, its nice error messages, or its wealth of FRP tutorials. Certainly, PureScript doesn't obviate Elm IMO. As to the lack of a REPL, doesn't Elm have one? http://elm-lang.org/blog/announce/repl http://elm-lang.org/blog/announce/repl