[deckiedan]

Fair enough. I actually don't use node, or js on the server. :-)

I still kind of like the idea though, of having only one source for (say) object definition, which is shared somehow between the client and server code. Being able to use the same unit tests to check my client side models as server side ones.

Maybe you could do it the other way around though - having your objects from your SQL Schema (or ORM, or whatever) generate the basic JS models... I dunno.

I totally agree that you need multiple languages, and that knowing multiple languages is incredibly valuable - and a lot of fun. I wrote a basic scheme in python for fun, and have a haskell textbook on my desk in front of me right now :-) - But I also feel that there should be some way that by using one language for all of your application logic (client and server side), there could be a benefit.

Sure, DOM manipulation is it's own weird thing - as is database querying, and document styling,- but the application logic that is done clientside and server side is very similar, I find.