https://www.reddit.com/r/learnjavascript/comments/qdmzio/dif...
or anything that touches array ops (concatenating, map, etc…). I mean, better and more knowledgeable people than me have written thousands of articles about those footguns and many more.
I am not a webdev, I don't want to remember those things, but more often than I would wish, I have to interop with JS, and then I'd rather use a better behaved language that compiles down to JS (there are many very good ones, nowadays) than deal with JS directly, and pray for the best.