<a href="http://opalrb.org" rel="nofollow">http://opalrb.org</a> Opal is a ruby to javascript compiler. It is source-to-source, making it fast as a runtime. Opal includes a compiler (which can be run in any browser), a corelib and runtime implementation. The corelib/runtime is also very small (10.8kb gzipped).
I'm a Ruby developer, but it's late and I'm tired: in plain English, what does this library get me and why does it cost $190?<p>I mean, there's lots of fun stuff in Ruby core (and a huge amount many Ruby devs are often unaware of) but if I'm ultimately still working in JavaScript, this hits a lot of walls. ES6 will allow something like method_missing, but we're not there yet.<p>Also: blocks.
I'm all for paying for good tools / libraries, but I personally wouldn't pay $190. I think a "pay what you think it's worth" system would be more effective.