In Perl, there are 2 different kinds of hashes.

• A hash, which is defined by the % and ( ) characters - %hash = ( );
• A reference hash, which is defined with the $ and { } characters - $hash = { };

Let's say you have the following hash. In this example, there are two keys, foo and bar.

my %hash = ( 'foo' => 'Hello',  'bar' => 'World');

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

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

Which shows that the employee key contains a value of John Doe.

$VAR1 = {
           'foo' => 'Hello',
           'bar' => 'World'
        };

Here is how you would delete the bar key.

delete $hash{bar};