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  1. or download this
    my $array = Object->new [ qw(1 .. 10) ];
my $array_length = $array->length;</p>
  2. or download this
    my $array = [ qw(1 .. 10) ];
my $array_length = scalar @$array;</p>
  3. or download this
    my $hash = Object->new { a => b };
print $hash->keys->count, "\n";