Nested map

use strict ;
use warnings ;

use Data::Dump ;

my @blah = ( 1 .. 5 )  ;
my @arr_of_arr = ( \@blah, \@blah ) ;

my @blahblah = map &map_sub, @arr_of_arr ;

dd( \@blahblah ) ;

sub map_sub { 
    my $param = $_   ;
    if( ( ref $param ) eq 'ARRAY' ) { 
    my @tmp = map &map_sub, @{ $param } ;
    return \@tmp ;
    }
    return $param + 1    ;
}
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