my $hashref  = { A => 1, B => 2 };
my $arrayref = [ 1, 2, 3 ];

##</code><code>##

print $hashref->{B}; # 2
print $arrayref->[2]; # 3

##</code><code>##

print %$hashref{B}; # 2
print @$arrayref[2]; # 3