What about something like: 
use warnings;
use strict;
use Data::Dumper;

namedMunge(p1=>'aValU', foo=>undef);
sub namedMunge
{
    my %ParamHash = @_;
    my %defaults = ( foo=>0, bar=>42, baz=>'pie');
    ApplyDefaultParams(\%ParamHash, \%defaults);
    
    # Do Munge here!
    
    print Dumper \%ParamHash;
}

sub ApplyDefaultParams
{
    my $ParamHashRef = shift;
    my $DefaultsHashRef = shift;
    
    foreach my $key (keys(%$DefaultsHashRef))
    {
        if (not exists($ParamHashRef->{$key}))
        {
            $ParamHashRef->{$key} = $DefaultsHashRef->{$key};
        }
    }
    return $ParamHashRef;
}

[download]
Resulting in:
$VAR1 = {
          'foo' => undef,
          'baz' => 'pie',
          'p1' => 'aValU',
          'bar' => 42
        };

[download]

In reply to Re^3: Default Values in Subroutines by SuicideJunkie
in thread Default Values in Subroutines by walkingthecow

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