in reply to Build a list of defined var's

Sorry, I misunderstood your question.

This comes close:

use strict;
use Data::Dumper;

my @array = ('A', 'b', undef, 0, 1, '', 'THE END');
$array[10] = 'The Real End';

my @defined_array = grep {defined} @array;

print Dumper(\@array, \@defined_array);

[download]
Output:
$VAR1 = [
          'A',
          'b',
          undef,
          0,
          1,
          '',
          'THE END',
          undef,
          undef,
          undef,
          'The Real End'
        ];
$VAR2 = [
          'A',
          'b',
          0,
          1,
          '',
          'THE END',
          'The Real End'
        ];

[download]

CountZero

A program should be light and agile, its subroutines connected like a string of pearls. The spirit and intent of the program should be retained throughout. There should be neither too little or too much, neither needless loops nor useless variables, neither lack of structure nor overwhelming rigidity." - The Tao of Programming, 4.1 - Geoffrey James

In Section Seekers of Perl Wisdom