my $array = Object->new [ qw(1 .. 10) ];
my $array_length = $array->length;</p>

##</code><code>##

my $array = [ qw(1 .. 10) ];
my $array_length = scalar @$array;</p>

##</code><code>##

my $hash = Object->new { a => b };
print $hash->keys->count, "\n";