How can i access the inlying properties?

Question

I have a perl variable like this. How can i access the inlying properties (like '706')?

my @config = [
        {
        'x' => [ 565, 706 ],
        'y' => [ 122 ],
        'z' => 34,
        'za' => 59,
    }
];

EDIT: print Dumper($config[0]); yields : $VAR1 = undef;

Looks like i get acces using $config[0][0]->{x}[1];. Why do i have to use [0][0] (one is clear, but he ssecond...)?

EDIT2: I am sorry for changing the data structure, but the definition which was given to me changed.

Answer 1

[EDIT: Follow the shifting problem definition.]

Given:

my @config = ( 
  [
    { # NB: insertion order ≠ traversal order
        "x"  => [ 565, 706 ],
        "y"  => [ 122 ],
        "z"  => 34,
        "za" => 59,
    },
  ],
);

Then this will do it:

# choice §1
print $config[0][0]{"x"}[-1];   # get 1ˢᵗ row’s xᵗʰ row’s last element

understanding of course that that is merely syntactic sugar for:

# choice §2
print $config[0]->[0]->{"x"}->[-1];   # get 1ˢᵗ row’s xᵗʰ row’s last element

and that that is just syntactic sugar for:

# choice §3
print ${ $config[0] }[0]->{"x"}->[-1];   # get 1ˢᵗ row’s xᵗʰ row’s last element

which in turn is just syntactic sugar for:

# choice §4
print ${ ${ $config[0] }[0] }{"x"}->[-1];   # get 1ˢᵗ row’s xᵗʰ row’s last element

which again is syntactic sugar for:

# choice §5
print ${ ${ ${ $config[0] }[0] }{"x"}}[-1];   # get 1ˢᵗ row’s xᵗʰ row’s last element

and that, of course, is equivalent to:

# choice §6
print ${ ${ ${ $config[0] }[0] }{"x"} }[ $#{ ${ ${ $config[0] }[0] }{"x"} } ];   # get 1ˢᵗ row’s xᵗʰ row’s last element