ch08.046_best

Perl Best Practices the source code

##############################################################################
##   Code fragment (Recommended) from Chapter 8 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;

use Digest::SHA qw( sha512 );

my @names = (
    'ID:002 oof',
    'ID:001 barbar',
    'ID:999 baz^3',
);


use Sort::Maker;
 
# Create sort subroutines (ST flag enables Schwartzian transform)...
make_sorter(name => 'sort_sha', code => sub{ sha512($_)    }, ST => 1 );
make_sorter(name => 'sort_ids', code => sub{ /ID:(\d+)/xms }, ST => 1 );
make_sorter(name => 'sort_len', code => sub{ length        }, ST => 1 );
 
# and later...
 
my @names_shortest_first = sort_len(@names);
my @names_digested_first = sort_sha(@names);
my @names_identity_first = sort_ids(@names);

use Data::Dumper 'Dumper';
warn Dumper [ 'SHORTEST', @names_shortest_first ];
warn Dumper [ 'DIGESTED', @names_digested_first ];
warn Dumper [ 'IDENTITY', @names_identity_first ];