my %hash = ( 'key' => 'value' );

print "exists \$hash{'key'}\n" if exists $hash{'key'};

my @array = ( 'value' );

print "exists \$array[\$index]\n" if exists $array[0];


##</code><code>##

exists operator argument is not a HASH element at test-5.00503.perl line 7.


##</code><code>##

exists $hash{'key'}
exists $array[$index]