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";
}
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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