Initial commit

9780596004781

 No newline at end of file

## Example files for the title:  

# Learning Perl Objects, References, and Modules, by Tom Phoenix

[![Learning Perl Objects, References, and Modules, by Tom Phoenix](http://akamaicovers.oreilly.com/images/9780596004781/cat.gif)](https://www.safaribooksonline.com/library/view/title/0596004788//)

The following applies to example files from material published by O’Reilly Media, Inc. Content from other publishers may include different rules of usage. Please refer to any additional usage rights explained in the actual example files or refer to the publisher’s website.

O'Reilly books are here to help you get your job done. In general, you may use the code in O'Reilly books in your programs and documentation. You do not need to contact us for permission unless you're reproducing a significant portion of the code. For example, writing a program that uses several chunks of code from our books does not require permission. Answering a question by citing our books and quoting example code does not require permission. On the other hand, selling or distributing a CD-ROM of examples from O'Reilly books does require permission. Incorporating a significant amount of example code from our books into your product's documentation does require permission.

We appreciate, but do not require, attribution. An attribution usually includes the title, author, publisher, and ISBN.

If you think your use of code examples falls outside fair use or the permission given here, feel free to contact us at <permissions@oreilly.com>.

Please note that the examples are not production code and have not been carefully testing. They are provided "as-is" and come with no warranty of any kind.

These are the sample files for use with the Alpaca book (Learning Perl

Objects, References & Modules by Randal L. Schwartz with Tom Phoenix,

available from O'Reilly and Associates.) These files may be distributed

under the same licensing terms as Perl itself.

Enjoy!

    -- Randal and Tom

alpaca sample files version 1.0  28 July 2003.

# In the hopes of saving some typing time, this is the sub from page 22

# (or so) in chapter 3 of the Alpaca book, ready for you to use in the

# second exercise at the end of the chapter.

sub check_required_items {

    my $who = shift;

    my $items = shift;

    my @required = qw(preserver sunscreen water_bottle jacket);

    my @missing = ();

    for my $item (@required) {

	unless (grep $item eq $_, @$items) {	# not found in list?

	    print "$who is missing $item.\n";

	    push @missing, $item;

	}

    }

    if (@missing) {

	print "Adding @missing to @$items for $who.\n";

	push @$items, @missing;

    }

}