The first numeric sort is 'numerifying' the strings and stripping the leading zeroes which messes up the rest of the routine.
I am not if that is right, at least not in the simple sense of what you say. See:
sub find_holes {
my @list = @{ shift() };
@list = sort { $a <=> $b } @list;
my $low = $list[0];
my $high = $list[-1];
my %isthere = map { $_ => 0 } ($low..$high);
print "@{[sort keys %isthere]}\n\n";
print "@list\n\n";
$isthere{$_} = "yes" for map {$_+0} @list;
my @vacancies = grep { not $isthere{$_} } sort keys %isthere;
return \@vacancies;
}
my @issues = @{ [
'00001',
'00002',
'00003',
'00004',
# '00005',
'00006',
'00007',
'00008',
'00009',
#...
] };
print join("\n", @{ find_holes( \@issues ) });
Prints:
d:\tmp\try>perl try.pl
perl try.pl
1 2 3 4 5 6 7 8 9
00001 00002 00003 00004 00006 00007 00008 00009
5
What the sort probably does is to fill the number entry in the glob of the entries of @list. But why does the ".." operator use the number slot, while the hash access code and print use the string slot?
Christian Lemburg
Brainbench MVP for Perl
http://www.brainbench.com
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