I got two out of two and then stopped. This is another "look how many weird results we can get out of javascript" exercise.

Gary Bernhardt covered this humorously here: https://www.destroyallsoftware.com/talks/wat

And Crockford covers some issues more formally in his talks.

The takeaway is that if you do something that can possibly be interpreted in a strange way, javascript is mostly likely going to interpret it in a way that you didn't expect. You could say it sucks because of that and/or you can look at the ecmascript standard and try to reason about it. But either way, it's best not to do anything even slightly ambiguous. Stick to the good parts.