ch09.042_prob

来自「Perl Best Practices the source code」· 042_PROB 代码 · 共 29 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;

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

sub how_many_defined {
    return grep {defined $_} @_;
}
 
# and "always" thereafter:
 
my $found = how_many_defined(@raw_samples);

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