The problem with using a javascript-emulated version is that it'd be way too limited, unless the dev went out of his way to cover much of the ruby language. Thi

The problem with using a javascript-emulated version is that it'd be way too limited, unless the dev went out of his way to cover much of the ruby language. This way, you can try the whole thing. JS emulated would be good if it was just a tutorial, but it's a bit more than that.