To get the total sums of cost, damage, armor, you can use the
map function to accumulate the various items.
#!/usr/bin/perl
use strict;
use warnings;
use List::Util 'sum';
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 $cost = sum(map $_->{cost}, values %$weapons_ref);
my $damage = sum(map $_->{damage}, values %$weapons_ref);
print "cost: $cost damage: $damage\n";
Prints:
cost: 157 damage: 30
