A hash seems the best option in the case described. It is also faster by several orders of magnitude (for your benchmarks, however accurate it may be).
my %hash; @hash{0, 15, 16, 31} = ();
# then add this to your benchmark
hash => sub {
while ( $data =~ /^(\d+) (\d+)/mg ) {
next if exists $hash{$1} or exists $hash{$2};
return 1;
}
},
Rate any_cr any ugly ugly_cr hash2 hash
any_cr 865/s -- -37% -54% -65% -100% -100%
any 1382/s 60% -- -27% -44% -100% -100%
ugly 1896/s 119% 37% -- -24% -100% -100%
ugly_cr 2489/s 188% 80% 31% -- -100% -100%
hash 3084047/s 356493% 222992% 162532% 123813% 26% --
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