FreeKB - Perl (Scripting) Hash Array (append values)
Perl (Scripting) - Hash Array (append values)

In this example, %hash contains a single key (foo), and the key is an empty array, as indicated by the [ ] characters.

my %hash = ( 'foo' => [] );

 

You can count the elements.

my $count = @{$hash{foo}};
print "\$count = $count \n";

 

Which will return 0, since foo is empty.

$count = 0

 

Let's say you do this.

%hash = ( 'foo' => [ 'John Doe','Jane Doe' ] );

 

Or this.

push @{$hash{foo}}, "John Doe";
push @{$hash{foo}}, "Jane Doe";

 

Dumper can be used to display the structure of the hash.

use Data::Dumper;
print Dumper \%hash;

 

Now, the foo key contains two values, John Doe and Jane Doe.

$VAR1 = {
          'foo' => [ 
                     'John Doe', 
                     'Jane Doe'
                   ]
        };

 

You can loop through the values in the foo key.

foreach my $foo (@{$hash{foo}}) {
  print "$foo \n";
}

 

Should return the following.

John Doe
Jane Doe

 



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