my $aref = [ 1 .. 5 ];
say $aref->[0];  # or ${$aref}[1]
say @{$aref}[3,1,2];
my $href = { a => 1, b => 2, c => 3 };
say $href->{a};  # or ${$href}{a}
say @{$href}{qw{b c}};
say %{$href}{qw{a c}};