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Since the weapon names don't seem to matter, only their attributes, I think it's simpler to iterate over the values of the weapons hash per Cristoforo's approach. This works with map, but I think it's even simpler (and IMHO clearer) to use for-loops:

Win8 Strawberry 5.8.9.5 (32) Sun 12/27/2020 5:07:00 C:\@Work\Perl\monks >perl -Mstrict -Mwarnings -l use Data::Dumper; my $weapons_ref = { dagger => { cost => 8, damage => 4, armor => 0, }, shortsword => { cost => 10, damage => 5, armor => 0, }, warhammer => { cost => 25, damage => 6, armor => 0, }, longsword => { cost => 40, damage => 7, armor => 0, }, greataxe => { cost => 74, damage => 8, armor => 0, }, }; my $sum_result; my @sum_fields = qw/cost damage armor/; # map { # works # my $attrib = $_; # map { $sum_result->{$_} += $attrib->{$_} } @sum_fields # } values %$weapons_ref; for my $hr_attrib (values %$weapons_ref) { $sum_result->{$_} += $hr_attrib->{$_} for @sum_fields; } print Dumper $sum_result; ^Z $VAR1 = { 'cost' => 157, 'damage' => 30, 'armor' => 0 };


Give a man a fish:  <%-{-{-{-<


In reply to Re^2: using ref to hash of hash effectively by AnomalousMonk
in thread using ref to hash of hash effectively by kalee

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