Very nice.

Here's what your code looks like:

#!/usr/bin/perl -w
use strict;

@[=[
    [ [[[[]]], [[]]], [[[]], []], [[]]                                
+ ],
    [ [[[[]]], [[]]], [[[[]]], []], [[[[]]]], [[[]]], []              
+ ],
    [ [[[[]]], [[]]], [[[[]]], []], [[[[]]]], [[]], []                
+ ],
    [ [[[[]]], [[]]], [[[[]]], []], [[[[]]]], [[[]]]                  
+ ],
    [ [[[[]]], []]                                                    
+ ],
    [ [[[[]]], [[]]], []                                              
+ ],
    [ [[[[]]], [[]]], [[[[]]], []], [[[]], []], [[[]]], [[]]          
+ ],
    [ [[[[]]], [[]]], [[[[]]], []], [[[]], []], [[[]]], [[]], []      
+ ],
    [ [[[[]]], [[]]], [[[[]]], []], [[[[]]]], [[[]]]                  
+ ],
    [ [[[[]]], [[]]], [[[[]]], []], [[[]], []]                        
+ ],
    [ [[[[]]], [[]]], [[[[]]], []], [[[]]], []                        
+ ],
    [ [[[[]]], [[]]], [[[[]]], []], [[[[]]]], [[]]                    
+ ],
    [ [[[[]]], []]                                                    
+ ],
    [ [[[[]]], [[]]], [[[[]]]]                                        
+ ],
    [ [[[[]]], [[]]], [[[[]]], []], [[[]]], []                        
+ ],
    [ [[[[]]], [[]]], [[[[]]], []], [[[[]]]], [[]]                    
+ ],
    [ [[[[]]], [[]]], [[[[]]], []], [[[]], []], [[[]]]                
+ ],
    [ [[[[]]], []]                                                    
+ ],
    [ [[[[]]], [[]]], [[[]], []]                                      
+ ],
    [ [[[[]]], [[]]], [[[[]]], []], []                                
+ ],
    [ [[[[]]], [[]]], [[[[]]], []], [[]], []                          
+ ],
    [ [[[[]]], [[]]], [[[[]]], []], [[[]], []], [[]], []              
+ ],
    [ [[[[]]], [[]]], [[[[]]], []], [[[]]], []                        
+ ],
    [ [[[[]]], [[]]], [[[[]]], []], [[[[]]]], [[]]], [[[[]], []], [[]]
+ ]
    ];

sub mysub {
    my $count = 0;
    $count    += 2**mysub($_) for @{ shift() };
    $count;
}

print chr mysub $_ for @{ @[[$[]}
[download]

The array @[ has one arrayref for each of the characters of "Just Another Perl Hacker". You are generating the character index from the number of sub-arrayrefs and elements counted recursively.

I particularly liked this:     @[[$[] $[ hardly ever gets a airing these days. Strangely, this throws a warning:     @[[0]
One cherry pie would be a lifetimes supply for me. ;-)

John.
--

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