It doesn't look like fantastic Ruby code, you're right. I just wouldn't agree that JS "works well" when it comes to their somewhat afterthought functional iterators.

What doesn't work well? The only thing I can think of, which comes up on occasion, is that you can't manually stop iteration in forEach without ugly tricks like throwing and catching an exception. I actually wanted that behavior for the first time recently, so I just used JQuery's each which lets you stop iteration by returning false. I'm assuming other JS utility libraries like underscore provide something similar.