"It was Mocha with CoffeeScript, not Ruby."

But the point is that this wasn't clear. I thought it was neat to watch (I watched a few minutes, skipped thru) but I've used node before and write a lot of JS; if I were new to this (or if you had been, say writing Lisp or something I don't know from) it would have been very confusing. The tests thing in particular was confusing. Lesson: strings resolve to true (??).

That said I think it is a great idea to do talks more like this; I've been to talks where people go on and on about the benefits and I'm thinking "where's the beef?" But a balance would be good: x% here's how you use node y%: here's WHY you use node. The latter was missing, and the former was missing if people go slowly or get stuck on the syntax or anything.