Comment by OJFord

I've never used a language with a 'cons' keyword, but nevertheless that's what I'd assume your 'con' was, if you didn't tell me otherwise.

I'm no particular JS fan, but 'const' is much clearer, it's a complete syllable, just like 'var' or 'func'. Yes 'fun' is used, but I think that's awkward for the same reason.