Re: How to pass two hashes to a sub

[Andrea Holstein]

Chuck Tomasi wrote:
> 
> I'd like to send two or more associative arrays (hashes) to a sub.  It looks
> like the first one makes it but the values of the second never get passed.
> Am I doing something wrong or is there a better way to do this (I'm hoping
> you don't say by reference or I'll have to setup a lot of temporary hashes
> to pass one or two key/value pairs on second, third, and fourth args)
> 

You should pass references to the hashes instead of the hashes itselfs:

E.g. with merging:

my %hash1;
my %hash2;

# now, I pass two references
my %merged = &merge( \%hash1, \%hash2 ); 

sub merge {
        # take the references;
        ($hash1_ref, $hash2_ref) = @_;
        
        # now dereference
        %hash1 = %$hash1_ref;
        %hash2 = %$hash2_ref;

        return (%hash1, %hash2);
}

Best Wishes,
Andrea

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