如何制作Perl“哈希数组阵列”？

Question

I think what I need is an Array of Array of Hash, but I have no idea how to make that.

Can Perl do that?

And if so, how would the code look like?

Answer 1

You can address elements of such a data structure thus:

$x->[1][2]{foo} = "hello"

You don't even have to pre-define the structure. Just start working with the elements as if they're already there.

Answer 2

perldoc perldsc是一个很好的文档，可以在Perl中了解数据结构。

Answer 3

my $aah =
        [ # outer array
                [ # first inner array
                        { # first inner hash
                                foo => 'bar',
                        },
                        { # second inner hash
                                bar => 'baaz',
                        },
                ],
                [ # secnd inner array
                        #...
                ],
                # ...
        ];

You can access the elements like this:

$aah->[0]->[1]->{bar} # => 'baaz'

Answer 4

my $arr = 
  [
    [
      {key1 => $value1, key2 => $value2},
      {key1 => $value3}
    ],
    [
      {rubbish => 'nonsense'},
    ]
   ];

etc.