ch13.034_best

来自「Perl Best Practices the source code」· 034_BEST 代码 · 共 38 行

##############################################################################
##   Code fragment (Recommended) from Chapter 13 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 Random::Utils qw( pick_from );
sub pick_from {
    croak q{Can't pick a random element from an empty list} if !@_;
    return @_[rand @_];
}

my @items = (1..10);
 
my $random_item = pick_from(@items);

use Data::Dumper 'Dumper';
warn Dumper [ $random_item ];

@items = ();
 
$random_item = pick_from(@items);

use Data::Dumper 'Dumper';
warn Dumper [ $random_item ];