[codingdave]

Look at the goals of a bootcamp in the first place - to get you just enough knowledge to have the minimum skill needed to be useful to a team. They are not trying to make you a computer scientist... they are trying to teach you as little as possible, while still knowing enough to get work done, which means knowing how to work with a toolkit that does most of the work for you. And RoR does that. It also is popular enough that once you know it, you can probably find a team using it that needs help.

And why JS? Because that is what runs in the browsers.