ch03.035_best

Perl Best Practices the source code

##############################################################################
##   Code fragment (Recommended) from Chapter 3 of "Perl Best Practices"    ##
##     Copyright (c) O'Reilly & Associates, 2005. All Rights Reserved.      ##
##  See: http://www.oreilly.com/pub/a/oreilly/ask_tim/2001/codepolicy.html  ##
##############################################################################


# Standard modules...
use strict;
use warnings;
use IO::Prompt;
use Carp;
use English qw( -no_match_vars );
use Data::Alias;
use Readonly;


sub swap_domain_and_range_of {
    my ($table_ref) = @_;
    
    my @pivotted_table;
    for my $x (0..$#{$table_ref}) {
        for my $y (0..$#{$table_ref->[$x]}) {
            $pivotted_table[$y][$x] = $table_ref->[$x][$y];
        }
    } 
 
    return \@pivotted_table;
}

my $table = [
    [1, 2, 3,],
    [4, 5, 6,],
    [7, 8, 9,],
];

my $pivotted = swap_domain_and_range_of($table);

use Data::Dumper 'Dumper';
warn Dumper [ $table, $pivotted ];