map is useful here. The following example assumes that keys in both hashes are the same; ie. %h2 does not have any extra keys that %h1 doesn't have.

use strict;
use Data::Dumper;

my %h1 = (a => 1, b => 2, c => 3);
my %h2 = (a => 6, b => 8, c => 0);

my %h3 = map {$_ => $h1{$_} + $h2{$_}} keys %h1;

print Dumper \%h3;

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Output:

$VAR1 = {
          'c' => 3,
          'b' => 10,
          'a' => 7
        };

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If %h2 does have keys that %h1 doesn't have, change this line:

my %h3 = map {$_ => $h1{$_} + $h2{$_}} keys %h1;

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...to this:

my %h3 = map {$_ => $h1{$_} + $h2{$_}} keys %h1, keys %h2;

[download]

In reply to Re: merge two hashes into one by stevieb
in thread merge two hashes into one by ovedpo15

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