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Either @non_dupe_rows is very poorly named, or my @non_dupe_rows = do { my %seen;grep !$seen{$_}++, @rows }; isn't doing what you think it's doing:

my @rows = qw/ 1 2 3 4 1 2 /; # 1 & 2 are dups my @non_dupe_rows = do { my %seen;grep !$seen{$_}++, @rows }; print "@non_dupe_rows\n";

prints

1 2 3 4

If you really want non-dup rows, try

my @rows = qw/ 1 2 3 4 1 2 /; # 1 & 2 are dups my @non_dupe_rows = do { my %seen; $seen{$_}++ for @rows; grep $seen{$_} == 1, keys %seen }; print "@non_dupe_rows\n";


In reply to Re: how to speed up dupe checking of arrays by FunkyMonk
in thread how to speed up dupe checking of arrays by ultibuzz

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