I'd:

use strict;
use warnings;
use Data::Dump::Streamer;

my @class = (40, 40, 40, 183, 183, 259, 244, 503);
my @qty = (260, 234, 211, 301, 401, 321, 210, 451);
my %bin =   map {$_ => [0, 0]} (0, 40, 183, 503, 442, 259, 244);

for my $i (0 .. $#class) {
    my $hkey = $class[$i];

    @{$bin{$hkey}} = ($bin{$hkey}[0]+1, $bin{$hkey}[1]+ $qty[$i]);
}

Dump (\%bin);

[download]

Note the use of a Perl for loop in place of the C loop and an array assignment in the for loop. Oh, and keep the scope of variables as small as possible ($hkey is declared inside the loop).

True laziness is hard work

In reply to Re: Better assignment to Hash of Arrays by GrandFather
in thread Better assignment to Hash of Arrays by journey

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