ch09.060_best

来自「Perl Best Practices the source code」· 060_BEST 代码 · 共 36 行

##############################################################################
##   Code fragment (Recommended) from Chapter 9 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 List::Util qw( first );

use Contextual::Return;
 
sub defined_samples_in {
    my @data = @_;

    return (
        LIST   {  grep {defined $_} @data }
        SCALAR { first {defined $_} @data }
    );
}


my @raw_samples = (undef, undef, 1, 2, undef, 3);

use Data::Dumper 'Dumper';
warn Dumper [ defined_samples_in(@raw_samples) ];
warn Dumper [ "".defined_samples_in(@raw_samples) ];