Or you could do it functionally rather than explicit recursion using List::Util's reduce (not that that's likely to be of any help to trolls who're unfamiliar with a bog simple recursive sub . . .). 

## (reduce #(hash-map %2 %1) 1 (reverse [:foo :bar :baz :quux]))
use List::Util qw( reduce );
use Data::Dumper qw( Dumper );
my $hash = reduce { +{ $b => $a } } 1, reverse( qw( foo bar baz quux )
+ );
say Dumper( $hash );
__END__
$VAR1 = {
          'foo' => {
                     'bar' => {
                                'baz' => {
                                           'quux' => '1'
                                         }
                              }
                   }
        };

[download]

The cake is a lie.
The cake is a lie.
The cake is a lie.

In reply to Re^2: Creating a Multi Level Hash from CSV by Fletch
in thread Creating a Multi Level Hash from CSV by workInProgress12

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