ch09.059_prob

来自「Perl Best Practices the source code」· 059_PROB 代码 · 共 34 行

##############################################################################
## Code fragment (NOT 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 );

sub defined_samples_in {
    my @data = @_;

    if (wantarray) {
        return grep {defined $_} @data;
    }
 
    return 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 [ scalar defined_samples_in(@raw_samples) ];