Comment by Kwantuum

Both of the things you quoted are basically gone in practice, you just always use const/let and always use triple-equals for equality comparisons and that's that. Most people that write JavaScript regularly will lint these out in the first place.

OTOH I think JS has great ergonomics especially wrt closures which a number of popular languages get wrong. Arrow functions provide a syntactically pleasant way to write lambdas, let/const having per iteration binding in loops to avoid nasty surprises when capturing variables, and a good number of standard methods that exploit them (eg map/filter on arrays). I also think, though a lot of people would disagree because of function coloring, that built-in async is a great boon for a scripting languages, you can do long operations like IO without having to worry about threading or locking up a thread, so you get to work with a single threaded mental model with a good few sharp edges removed.