I didn't realize that using console.log on Codewars would show you your log as well as run your code. New here, as you can see. Thanks for the tip.

I learned a lot from this one. It would be nice to see what the inputs are when the tests are failing, but having to guess led me to do some research I wouldn't have otherwise done.

This is magic. Would anyone be kind of enough to explain what's going on in this code? Especially the recursive part?

This kata was challenging for me, but I enjoyed it very much and learned a lot. Also, I think this one was very well crafted. A complex problem to solve, but not because it was hard to figure out what the problem was asking for. Well done.

This is very impressive. I hope to eventually to be able to work with regexps like this.