ch09.006_prob

来自「Perl Best Practices the source code」· 006_PROB 代码 · 共 41 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;


sub fix {
    my (@args) = @_ ? @_ : $_;    # Default to fixing $_ if no args provided
 
    # Fix each argument by grammatically transforming it and then printing it...
    for my $arg (@args) {
        $arg =~ s/\A the \b/some/xms;
        $arg =~ s/e \z/es/xms;
        print $arg, "\n";
    }
 
    return;
}
 
# and later...
 
&fix('the race');    # works as expected, prints: 'some races'
 
for ('the gaze', 'the adhesive') {
    &fix;            # doesn't work as expected: looks like it should fix($_),
                     # but actually means fix(@_), using this scope's @_!
                     # See the 'perlsub' manpage for details
}