Until recently I never heard of crystal. There is a humble bundle for programming that includes a crystal book. That was the first time I heard of it.

I will have to take a look at the language. Who knows when having knowledge of crystal will be useful

What could be the “killer app” for Crystal is an equivalent of Rails, since its syntax attempts to be very similar to Ruby. Even supposing it maintains all of Rails’ inefficiencies, if it “just works” and has a very small learning curve for RoR veterans, adoption could grow steadily

I’d be interested in hearing what it is about the language that has gotten you so excited about it.