Definitely less compact, arguably more readable — although I tend to read the compact stuff more easily.
But which is faster? I know I was expecting a speedup from using each instead of keying each by hand. But does the sub slow it down?
use strict;
use Benchmark qw(cmpthese);
my %bdry;
for my $i ( 1 .. 35 ) {
for my $j ( 1 .. 35 ) {
$bdry{$i}{$j} = 1+ int rand 50;
}
}
cmpthese(1_000, { jetsway=>\&jetsway, mwahsway=>\&mwahsway });
sub jetsway {
my @keys =
sort { $bdry{ $b->[0] }{ $b->[1] } <=> $bdry{ $a->[0] }{ $a->[
+1] } }
map { my $k = $_; map { [$k, $_] } keys %{ $bdry{$k} } }
keys %bdry;
return @keys;
}
sub mwahsway {
my @flipped_hash = reverse sort {$a->[0] <=> $b->[0] } flippout (%
+bdry);
return @flipped_hash;
}
sub flippout {
my %h = @_;
my @f;
while( my ($k,$v) = each %h ) {
while( my ($vk,$vv) = each %$v) {
push @f, [$vv, $k, $vk]
}
}
return @f
}
Rate jetsway mwahsway
jetsway 103/s -- -47%
mwahsway 195/s 89% --
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