Created
September 22, 2014 17:30
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A benchmark to find the first problem in a list
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#!/usr/bin/perl | |
# http://blogs.perl.org/users/jt_smith/2014/09/logically-and-yourself.html | |
use strict; | |
use Ouch; | |
use Benchmark qw(:all); | |
use List::MoreUtils qw(any); | |
use v5.10; | |
my @tests = ( | |
[ '0 first, 100 elements' => [ 0, (1) x 99 ] ], | |
[ '0 last, 100 elements' => [ (1) x 99, 0 ] ], | |
[ '0 middle, 100 elements' => [ (1) x 49, '0', (1) x 50 ] ], | |
[ '0 first, 1,000 elements' => [ 0, (1) x 999 ] ], | |
[ '0 last, 1,000 elements' => [ (1) x 999, 0 ] ], | |
[ '0 middle, 1,000 elements' => [ (1) x 499, '0', (1) x 500 ] ], | |
); | |
foreach my $test ( @tests ) { | |
my( $label, $list ) = @$test; | |
my @list = @$list; | |
say '-' x 73; | |
say "Testing $label"; | |
timethese( 1_000, { | |
'&&=' => sub { | |
my $is_proofed = 1; | |
foreach my $x (@list) { | |
$is_proofed &&= eval { $x ? 1 : ouch(500, 'bad stuff') }; | |
} | |
}, | |
'$@' => sub { | |
my $is_proofed = 1; | |
foreach my $x (@list) { | |
eval { $x ? 1 : ouch(500, 'bad stuff') }; | |
if ($@) { | |
$is_proofed = 0; | |
} | |
} | |
}, | |
'$@-last' => sub { | |
my $is_proofed = 1; | |
foreach my $x (@list) { | |
eval { $x ? 1 : ouch(500, 'bad stuff') }; | |
if ($@) { | |
$is_proofed = 0; | |
last; | |
} | |
} | |
}, | |
'foreach-eval' => sub { | |
my $is_proofed = 1; | |
foreach my $x (@list) { | |
eval { $x ? 1 : ouch(500, 'bad stuff') }; | |
} | |
}, | |
'ouch' => sub { | |
eval { ouch(500, 'bad stuff') }; | |
}, | |
'any' => sub { | |
my $is_proofed = 1; | |
my $is_proofed = any { | |
! defined eval { $_ ? 1 : ouch(500, 'bad stuff') } | |
} @list; | |
}, | |
}); | |
} |
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