Pretty much anything I don't use on at least a weekly basis. I usually check manpages first though when that's an option, because I can often find what I'm looking for that way far faster than I can with Google.
FWIW, of the languages I've used, I found myself doing it more with JS for core language functionality (that is, stuff that's part of the ECMA standard in this case, as opposed to web API's) than any other language I've tried, even stuff as 'out there' as Erlang or Perl in terms of syntax. And I know quite a few other developers who would almost certainly say the same, which really says something about JS IMO.
Yeah I would second that; JS tops it out of all the languages I use.
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