In terms of efficency - I'm not too up to speed on perl internals etc. - but isn't it likely that glob constructs lead back to the same underlying functions?

That is - opendir and readdir (c functions - not perl) ? So ultimately - aren't most of these options going to be as efficent (or close to it)?

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game(Wookie,opponent) eq 'Wookie' ? undef $problem : remove_limbs(arms,opponent);