I want to compare the && vs. the and operator, and the || vs. or operator in Perl:
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#!/usr/bin/perl use strict; use Benchmark qw(:all) ; my $x = 100; my $y = 0; cmpthese(-1, { 'and' => sub {if($y and $x){print;}print;}, '&&' => sub {if($y && $x){print;}print;}, }); cmpthese(-1, { 'or' => sub {if($y or $x){print;}print;}, '||' => sub {if($y || $x){print;}print;}, }); ++$y; cmpthese(-1, { 'and' => sub {if($y and $x){print;}print;}, '&&' => sub {if($y && $x){print;}print;}, }); cmpthese(-1, { 'or' => sub {if($y or $x){print;}print;}, '||' => sub {if($y || $x){print;}print;}, }); |
First result (1 && 0) vs. (1 and 0):
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Rate && and && 4497569/s -- -3% and 4626070/s 3% -- |
Second result (1 or 0) vs. (1 || 0):
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Rate or || or 2683073/s -- -15% || 3163806/s 18% -- |
Third result (1 && 1) vs. (1 and 1):
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Rate && and && 2525239/s -- -1% and 2548621/s 1% -- |
Fourth result (1 or 1) vs. (1 || 1):
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Rate or || or 2912710/s -- -33% || 4324590/s 48% -- |
It seems the “and” and “&&” don’t make really different, but the “or” and “||” operator seems different.I don’t know why the “||” are 18-48% faster than the “or” …. and the “and” is only about 1-3% faster.
Now we check if they work as they should:
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if(false() and true()){print;}print"END\n"; if(false() && true()){print;}print"END\n"; if(false() or true()){print;}print"END\n"; if(false() || true()){print;}print"END\n"; if(true() and true()){print;}print"END\n"; if(true() && true()){print;}print"END\n"; if(true() or true()){print;}print"END\n"; if(true() || true()){print;}print"END\n"; sub true() {print "sub true";return(1);} sub false() {print "sub false";return(0);} |
result looks good they abort if a true is impossible:
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sub falseEND sub falseEND sub falsesub trueEND sub falsesub trueEND sub truesub trueEND sub truesub trueEND sub trueEND sub trueEND |
That is more a check up and not really a Benchmark.
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