Created
May 7, 2022 22:30
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How is faster The Postfix Dereference
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#!/usr/bin/env perl | |
# @{ $neko->{'nyaan'} } vs. $neko->{'nyaan'}->@* | |
use strict; | |
use warnings; | |
use Benchmark ':all'; | |
use Test::More 'no_plan'; | |
my $neko1 = { 'nyaan' => \'2', 'cat' => [1..10] }; | |
my $neko2 = { 'nyaan' => \'2', 'cat' => [1..10] }; | |
sub prefix { | |
my $v = scalar keys %$neko1; | |
$v += scalar @{ $neko1->{'cat'} }; | |
$v += int ${ $neko1->{'nyaan'} }; | |
return $v; | |
} | |
sub postfix { | |
my $v = scalar keys $neko2->%*; | |
$v += scalar $neko2->{'cat'}->@*; | |
$v += int $neko2->{'nyaan'}->$*; | |
return $v; | |
} | |
is prefix(), 14; | |
is postfix(), 14; | |
printf("Running with Perl %s on %s\n%s\n", $^V, $^O, '-' x 80); | |
cmpthese(6e6, { | |
'@$neko' => sub { prefix() }, | |
'$neko->@*' => sub { postfix() }, | |
} | |
); | |
__END__ | |
Running with Perl v5.32.0 on darwin | |
-------------------------------------------------------------------------------- | |
Rate @$neko $neko->@* | |
@$neko 3773585/s -- -4% | |
$neko->@* 3947368/s 5% -- | |
Running with Perl v5.30.0 on darwin | |
-------------------------------------------------------------------------------- | |
Rate @$neko $neko->@* | |
@$neko 3636364/s -- -7% | |
$neko->@* 3896104/s 7% -- | |
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