[sic1]

While we are posting contrived examples. What was ever wrong with this?

    var Foo = function() {};

    Foo.prototype.jump = function() {
        return "I jump."
    };

    Foo.prototype.run = function() {
        return "I run."
    };

    var mario = new Foo();
    mario.run();
    mario.jump();

I can't imagine that opal code running nearly as fast as javascript. And if we are waving around compiled js - coffeescript does a much better job of being readable. You just black-boxed the whole thing. I like to know what is happening with my js.

Cool for the rubyist in you i guess. I just kinda go o_0