[ABE.pm] data structures within data structures

[Ricardo SIGNES]

* Faber Fedor <faber at linuxnj.com> [2004-12-31T11:04:05]
> I want to create an array/hash that contains in each row variables and
> arrays.  If I have two vars and an array, it might look something like
> this:
> 
>     my $ds =( {"1", "2", (a,b,c,d)   },
>               {"3", "4", (e,f,g)     },
> 	      {"5", "6", (h,i,j,k,l) }
> 	    );

If "ds" is an array, you need to use @ds, not $ds.  If it is a scalar,
you need to use [] not () to create an array reference to store in it.

You can't use {} to put non-hash-references inside @ds.  Your lists,
there, are not indexed by name, they're positional, so they're array
references.  Use [].  

A list like "(a,b,c,d)" can't be a member of an array, you need to use a
reference.

You don't need to quote numbers.  You do need to quote letters.  You can
use the qw() operator to create a list of quoted words, and then
reference it by enclosing it in [].

  my @ds = (
    [ 1, 2, [ qw(a b c d  ) ] ],
    [ 3, 4, [ qw(e f g    ) ] ],
    [ 5, 6, [ qw(h i j k l) ] ]
  );

To access the letter 'g', you would say: $ds[1][2][2].

$ds[1] is [ 3, 4, [ qw(e f g) ] ]

$ds[1][2] is [ qw(e f g) ]

$ds[1][2][2] is 'g'

-- 
rjbs
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