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It appears to be the index of the check based on length of the supplied password. You have 4 valid conditions that lead to additional checks; the 5th one is always invalid. Indexes 0, 1, 2, and 3 elements of the array of subroutine references he suggests will call the function appropriate for the length.
when ($_ >= 8 && $_ <= 11) # $index here is min( 2, 5), so 2 when ($_ >= 12 && $_ <= 15) { # $index here is min( 3, 5), so 3 when ($_ >= 16 && $_ <= 19) { # $index here is min( 4, 5), so 4 when ($_ >= 20) { # $index here is min( 5+,5), so alw +ays bounded at 5

TBH it's not clear enough to make great sense to me, but he appears to be suggesting that you put your ranges into buckets based on the formula he gave; for a length of 20 or more, you're always going to fall into bucket 5 (or perhaps element 3) of your array of checks. This is actually a pretty good way to determine a bucket, so then you can have an array of checks; or to make it more clear, a hash:
my %check_dispatch = ( 2 => sub { ... }, # or better, define in named subs and, => \&check1 +, etc 3 => sub { ... }, 4 => sub { ... }, 5 => sub { ... }, ); my $pw = $_; my $index = min( (length $pw)/4, 5); if ($check_dispatch{$index} and 'CODE' eq ref $check_dispatch{$index}) + { die if not $check_dispatch{$index}->($pw); }

In reply to Re^3: Efficient way to verify scalar contents by perlfan
in thread Efficient way to verify scalar contents by x_stream3m

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