return $_ || last for subroutine() (T04) was my choice for syntax, and I was sorry to see that the for loops are so slow.
The winner was if (my $ret = subroutine()) { return $ret)} as might be expected, as this is (I would assume) the most common way to test a return value.
Rate T11 T02 T10 T03 T01 T04 T09 T08 T06 T07 T05
T11 37594/s -- -8% -12% -12% -29% -31% -39% -39% -47% -47% -50%
T02 40959/s 9% -- -4% -4% -23% -24% -33% -33% -42% -42% -46%
T10 42581/s 13% 4% -- -0% -20% -21% -30% -30% -40% -40% -44%
T03 42708/s 14% 4% 0% -- -20% -21% -30% -30% -39% -39% -44%
T01 53095/s 41% 30% 25% 24% -- -2% -13% -13% -25% -25% -30%
T04 54097/s 44% 32% 27% 27% 2% -- -12% -12% -23% -23% -29%
T09 61265/s 63% 50% 44% 43% 15% 13% -- 0% -13% -13% -19%
T08 61265/s 63% 50% 44% 43% 15% 13% 0% -- -13% -13% -19%
T06 70447/s 87% 72% 65% 65% 33% 30% 15% 15% -- 0% -7%
T07 70447/s 87% 72% 65% 65% 33% 30% 15% 15% 0% -- -7%
T05 75918/s 102% 85% 78% 78% 43% 40% 24% 24% 8% 8% --
use strict; use Benchmark qw (cmpthese); sub froutine { 0 } sub troutine { 1 } my $tests = { 'T 01' => sub {for (troutine()) { return $_ || last; } 0;}, 'F 01' => sub {for (froutine()) { return $_ || last; } 0;}, 'T 02' => sub {for (troutine()) { return $_ if $_; } 0;}, 'F 02' => sub {for (froutine()) { return $_ if $_; } 0;}, 'T 03' => sub {$_ and return $_ for troutine(); 0;}, 'F 03' => sub {$_ and return $_ for froutine(); 0;}, 'T 04' => sub {return $_ || last for troutine(); 0;}, 'F 04' => sub {return $_ || last for froutine(); 0;}, 'T 05' => sub {if (my $ret = troutine()) { return $ret }; 0;}, 'F 05' => sub {if (my $ret = froutine()) { return $ret }; 0;}, 'T 06' => sub {return $_ if local $_ = troutine(); 0;}, 'F 06' => sub {return $_ if local $_ = froutine(); 0;}, 'T 07' => sub {if (local $_ = troutine()) { return $_ }; 0;}, 'F 07' => sub {if (local $_ = froutine()) { return $_ }; 0;}, 'T 08' => sub {return $_ while (local $_ = troutine()); 0;}, 'F 08' => sub {return $_ while (local $_ = froutine()); 0;}, 'T 09' => sub {while (local $_ = troutine()) { return $_ }; 0;}, 'F 09' => sub {while (local $_ = froutine()) { return $_ }; 0;}, 'T 10' => sub {return $_ for troutine() or (); 0;}, 'F 10' => sub {return $_ for froutine() or (); 0;}, 'T 11' => sub {return $_ for grep $_, troutine(); 0;}, 'F 11' => sub {return $_ for grep $_, froutine(); 0;}, }; for my $key (keys %$tests) { $_ = 'test'; if ($key =~ /^T/) { die unless $tests->{$key}->(); } else { die if $tests->{$key}->(); } die unless $_ eq 'test'; } cmpthese(-1, $tests); cmpthese(-1, { 'T01' => sub {$tests->{'T 01'}->(); $tests->{'F 01'}->() }, 'T02' => sub {$tests->{'T 02'}->(); $tests->{'F 02'}->() }, 'T03' => sub {$tests->{'T 03'}->(); $tests->{'F 03'}->() }, 'T04' => sub {$tests->{'T 04'}->(); $tests->{'F 04'}->() }, 'T05' => sub {$tests->{'T 05'}->(); $tests->{'F 05'}->() }, 'T06' => sub {$tests->{'T 06'}->(); $tests->{'F 06'}->() }, 'T07' => sub {$tests->{'T 07'}->(); $tests->{'F 07'}->() }, 'T08' => sub {$tests->{'T 08'}->(); $tests->{'F 08'}->() }, 'T09' => sub {$tests->{'T 09'}->(); $tests->{'F 09'}->() }, 'T10' => sub {$tests->{'T 10'}->(); $tests->{'F 10'}->() }, 'T11' => sub {$tests->{'T 11'}->(); $tests->{'F 11'}->() }, } );
In reply to Re: looking for a good idiom: return this if this is true
by gam3
in thread looking for a good idiom: return this if this is true
by merlyn
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