Perl: Hash Hacking Functions

Assigning	$countries{PT}='Portugal';
Deleting	delete $countries{NL};

Accessing Your Hash
Assuming you keep the same %countries hash as above, here are some useful ways to access it:

All the keys	print keys %countries;
All the values	print values %countries;
A Slice of Hash :-)	print @countries{'NL','BE'};
How many elements ?	print scalar(keys %countries);
Does the key exist ?	print "It's there !\n" if exists $countries{'NL'};