Keep in mind that perl currently doesn't do nested subs
(this is the souce of many a warning for those using Apache::Registry with mod_perl; see the mod_perl guide
for a detailed explanation).
You could possibly return a list of coderefs that you create and use sort_em more as a sort routine factory.
sub sort_em {
my $src = shift;
return {
up => sub { $src->{$a} <=> $src->{$b} },
down => sub { $src->{$b} <=> $src->{$a} },
}
}
my %numbers = ( qw( a 5 c 4 d 1 ) );
my $num_sorts = sort_em( \%numbers );
print "UP:\n",
join( "\n", map { "$_ $numbers{$_}" }
sort { $num_sorts->{up}->() } keys %numbers ),
"\nDOWN\n",
join( "\n", map { "$_ $numbers{$_}" }
sort { $num_sorts->{down}->() } keys %numbers ),
"\n";
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