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Re: Unique key/value pair in Multiple key values pair in Hash

by roboticus (Chancellor)
on Feb 18, 2013 at 13:49 UTC ( #1019343=note: print w/replies, xml ) Need Help??

in reply to Unique key/value pair in Multiple key values pair in Hash


If you're interested in the unique values, I'd suggest adding another level to your hash, something like:

use strict; use warnings; my %hash; while (<DATA>) { s/\s+$//; my ($key1, $key2) = split /\s+/, $_; $hash{$key1}{$key2}++; } for my $k1 (sort keys %hash) { print "$k1: ", join(", ", sort keys %{$hash{$k1}}), "\n"; } __DATA__ Lemon Juice Lemon Cake Apple Cider Lemon Cake Apple Butter Apple Sauce Apple Juice Lemon Juice

Note: The code is untested, but I'd expect output like:

Apple: Butter, Cider, Juice, Sauce Lemon: Cake, Juice


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