programming-examples/perl/Hash/Using customized function to sort keys in a hash.pl

$hash{fruit} = apple;
$hash{sandwich} = hamburger;
$hash{drink} = bubbly;

foreach $key (sort {myfunction($a, $b)} keys %hash) {
    print "$key => $hash{$key}\n";
}

sub myfunction
{
   return (shift(@_) cmp shift(@_));
}