JS method names I still can't remember, even after 6 years of writing in it:

append is called concat,
any is called some,
all is called every,
contains is called includes

I always have to pause for a good long while or look it up when I need to use any of these is annoying, but my brain refuses to adapt to these names.

JS is the godfather of shitting on the principle of least surprise.

ah yes, the concatChild and querySelectorEvery. Forget them every time

Yep, that’s JS for you.
I have to look them up pretty often, too — especially since I’ve been switching between Ruby (with its consistency and all its aliases) and JS (with its none and none).

Personally, I have trouble remembering the names of the random functions because they’re so different between languages: rand, rand(), RND, random(), randInt(), Math.random(), Math.rand(), etc.

because the convention of the language you use is “right”, while other conventions are “wrong”. Gotcha fam