Hello milanpwc,

From the documentation exists:

A hash or array element can be true only if it's defined and defined o
+nly if it exists, but the reverse doesn't necessarily hold true.
[download]

So why you are expecting to be true on not defined elements (not existing elements)?

Is it more clear or still confusing?

Also take notice from documentation:

exists may also be called on array elements, but its behavior is much 
+less obvious and is strongly tied to the use of delete on arrays.

WARNING: Calling exists on array values is strongly discouraged. The n
+otion of deleting or checking the existence of Perl array elements is
+ not conceptually coherent, and can lead to surprising behavior.
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Update: I think I understand why you are confused. You are not assigning to all elements in the array the value 2. Only to one element. See below:

#!/usr/bin/perl
use strict;
use warnings;
use Data::Dumper;

my @array;
$array[3] = 2;
print Dumper \@array;

__END__

$ perl test.pl 
$VAR1 = [
          undef,
          undef,
          undef,
          2
        ];
[download]

BR / Thanos