JS has some properties that are typically associated with functional languages but is missing others. But then again, so does Java if you're willing to ignore the lack of syntactic sugar for them, so what do definitions even mean anymore.
Java only got some functional trappings fairly late in its life.
JavaScript was a relative transparent reskin of a (rushed) Lisp from the start.
Which language are you talking about?
The one that controls the web application you're currently using.
Controls the comment collapsing, everything else doesn't require JS.