Hi tybalt89,

Sorry to post this so late but I couldn't find time to do this earlier. I have a question regards your technique to merge and the one that I posted.

With the method that I posted I specifically did not choose to use Hash::Merge and also specifically not { ( %{ $ ... }, %{ $ ... } ) } but instead to make it LEFT_PRECEDENT on the dir1 .. dirN. (Even though the design criteria said that these elements would be unique). The method that I created would ignore any new 'dir' element that already existed and so it will not corrupt already collected data.

If I would have used Hash::Merge I would have probably done something like:

use strict ;
use warnings ;
use Data::Dumper ;
use List::Util qw { sum0 } ;
use Hash::Merge ;

my $VAR1 = {
     # Same as before
        };
my $VAR2 = {
    # same as before
        };
my $merger = Hash::Merge->new('RETAINMENT_PRECEDENT');
my $VAR3 = $merger->merge( $VAR1, $VAR2 ) ;
foreach(keys %{$VAR3->{ total }}) {
    if ( ref $VAR3->{ total }->{ $_ } eq 'ARRAY' ) {
        $VAR3->{ total }->{ $_ } = sum0 @{$VAR3->{ total }->{ $_ }} ;
    }
}
print Dumper( $VAR3 ) ;

[download]

When receiving 'dir' elements again and using the technique of { ( %{ $ ... }, %{ $ ... } ) } would corrupt the data:

My question basically is, which of the three techniques is in your opinion more robust. Even though I directed this question to tybalt89, anyone else feel free to answer as well of course.

In reply to Re^2: Merge hashes in specific format by Veltro
in thread Merge hashes in specific format by ovedpo15

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