ch05.053_best

Perl Best Practices the source code

##############################################################################
##   Code fragment (Recommended) from Chapter 5 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;

my @frames = 1..10;
my %active = (
    'top'       => 99,
    'prev'      => 98,
    'backup'    => 42,
    'emergency' => 911,
    'spare'     => 66,
    'rainy day' => 'Monday',
    'alternate' => -1,
    'default'   => 42,
);



Readonly my %CORRESPONDING => (
  # Key of         Index of
  # %active...     @frames...
    'top'        =>  -1,
    'prev'       =>  -2,
    'backup'     =>  -3,
    'emergency'  =>  -4,
    'spare'      =>  -5,
    'rainy day'  =>  -6,
    'alternate'  =>  -7,
    'default'    =>  -8,
);
 
@frames[ values %CORRESPONDING ] = @active{ keys %CORRESPONDING }; 


use Data::Dumper 'Dumper';
warn Dumper [ @frames ];