What are you continually forgetting?

Once every two months or so I need to look up or test in a console window whether javascript's Array.slice() method mutates the original array.

Partly because I only occasionally program these days and partly because I'm not too bright, the same pattern repeats itself with a large amount of similar technical information - cmd line options, emmit expansions, etc.

Are others conscious of the same pain?

What specific regularly-referenced information is stubbornly stuck on the tip of your tongue?

(disclaimer: I'm working on a tool to address this.)

: it does not