Stimulus controllers aren't supposed to reach outside their own element (so we can't do this with targets). Perhaps the controller should be bigger to encompass more, but I wanted to see if I could avoid making a mega component that does everything. For now it seems appropriate just to pass a selector in.
Another option is to publish events on other controllers using Outlets, but I don't know if we need to go there just yet.
I found myself trying to write Ruby in Javascript, and it's not nearly as pretty..
Javascript now has more advanced data structures like Map, but it's rather useless because it doesn't have the usual iterator methods (such as filter, map, reduce etc).
Also for the spec I wasn't sure of the best approach, so will gladly recieve feedback.
