in reply to Like in hashes, do we have something like exists in arrays as well.

use strict;
use warnings;

my @stuff = (0,1, undef);

for (0..3)
{
    print "Element $_ : " . 
    (!exists ($stuff[$_]) ? 'Does not exist' :
    !defined ($stuff[$_]) ? 'is Undef' :
    "is '$stuff[$_]'")
    . "\n";    
}

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Gives: 
>perl test.pl
Element 0 : is '0'
Element 1 : is '1'
Element 2 : is Undef
Element 3 : Does not exist

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