Always pass referances not data structures hence \ operator is an optimistaion sub(\@array) instead of sub(@array)
Only use what you need from modules use CGI qw(:standard);
Also I like shortcut operators 
my $i ||=0 ;
my $i =shift || 0;

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also I like ? operator instead of if's 
$i?$i=1:$i=0;

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is !~ an optimisation over just negating the result of =~, I dunno but I think !~ looks better

In reply to Re: Re: Re: Idiomatic optimizations by hakkr
in thread Idiomatic optimizations by Juerd

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