I can't help but wonder why you would require the caller to pass a parameter you're never going to use?
If there is a good reason, (and I cannot think of one), then given the not insignificant difference in performance:$a='a'x1e6; $b=12345;
cmpthese -1,{
a=>q[ sub{ my( undef, $x ) = @_ }->( $a, $b ) ],
b=>q[ sub{ my $x = $_[1] }->( $a, $b ) ],
c=>q[ sub{ my( $unused, $x ); }->( $a, $b ) ],
};;
Rate a b c
a 1703708/s -- -19% -20%
b 2107186/s 24% -- -1%
c 2129207/s 25% 1% --
I'd be asking myself if I thought that assignment to undef was any clearer than assignment to a variable called $unused?
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.
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