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More than Simple Lists and Hashes! example from a Well House Consultants training course
More on More than Simple Lists and Hashes! [link]

This example is described in the following article(s):
   • Transforming data in Perl using lists of lists and hashes of hashes - [link]

Source code: ar3.cgi Module: P217
#!/usr/bin/env perl

# Convert a file of people, with the skills of each ...
# ... to a report of skills, with a list of the people with each

print <<"TOP";
Content-type: text/html

<title>Who can help me program in ...</title>
<h1>Table of skills, with people who know 'em</h1>

while (<DATA>) {
        ($name,@skills) = split;
        last if (/DONE/);
        foreach $sk(@skills) {
                push @{$sktab{$sk}},$name;

foreach $sk(sort (keys (%sktab))) {
        print "Skill: $sk<br>\n";
        @peeps = sort(@{$sktab{$sk}});
        print "Practitioners: @peeps<br><br>\n\n";

print <<"BOTTOM";

# For ease of demonstration, data is below not in a separate file
# And we have added a DONE at which the program stops reading.

antonia Perl XML PHP Knitting MySQL
barbara Tcl/Tk Lua Ruby Java
cherry Perl Java Ruby MySQL
delia XML PHP Java Lua
ethel MySQL Perl Tcl/Tk Lua
florence Javascript Ruby Lua PHP Java
gloria XML Perl Tcl/Tk MySQL
hazel PHP Python Perl Ruby Lua
iris Perl MySQL Tcl/Tk
jenny XML Perl Ruby Lua
kerry ASP Tcl/Tk Ruby MySQL
leane PHP Python Lua Perl Java
margaret XML Ruby MySQL Tcl/Tk
nina Tcl/Tk Perl Lua Ruby PHP
olivia MySQL Python Lua PHP
petra XML Tcl/Tk Lua Perl Ruby
queenie Lua Ruby Perl MySQL
rita PHP Lua Ruby Perl
sally Tcl/Tk Perl XML MySQL
tina Tcl/Tk Ruby Java
uva MySQL Perl Java PHP
venus Java Perl Ruby Lua
wendy Perl Tcl/Tk Lua MySQL
xena Java Perl PHP Lua XML
yollanda Ruby MySQL Tcl/Tk
zoe Ruby Lua Perl PHP
adam Python Tcl/Tk Perl MySQL
alex MySQL Ruby PHP
barry Python XML Java Perl PHP
charles Perl Ruby MySQL Tcl/Tk
david Perl Tcl/Tk Java
ed Ruby Perl Java PHP
fred MySQL Perl Java XML
graham Lua Perl Tcl/Tk
harry PHP Python Java
ivan Ruby Java Perl Tcl/Tk MySQL
john PHP XML Java Perl
ken Tcl/Tk Python Java Perl
len Perl Java MySQL Ruby
morris Perl Java PHP Tcl/Tk
nigel PHP Python Java Perl
orpheus MySQL Ruby Tcl/Tk XML
peter PHP Java Perl
quentin Tcl/Tk Perl PHP Ruby
rupert Java Python MySQL
steve Tcl/Tk Perl PHP Ruby
tommy Perl Java XML
ulsyees Java PHP Perl
victor Ruby Perl Tcl/Tk MySQL
william Ruby Perl PHP
xavier PHP Java Perl
yuri XML PHP Perl Tcl/Tk
zachary MySQL Java Tcl/Tk

Learn about this subject
This module and example are covered on the following public courses:
 * Perl Programming
 * Perl for Larger Projects
 * Perl bootcamp
 * Learning to program in Perl
 * Perl Programming
Also available on on site courses for larger groups

Books covering this topic
Yes. We have over 700 books in our library. Books covering Perl are listed here and when you've selected a relevant book we'll link you on to Amazon to order.

Other Examples
This example comes from our "More than Simple Lists and Hashes!" training module. You'll find a description of the topic and some other closely related examples on the "More than Simple Lists and Hashes!" module index page.

Full description of the source code
You can learn more about this example on the training courses listed on this page, on which you'll be given a full set of training notes.

Many other training modules are available for download (for limited use) from our download centre under an Open Training Notes License.

Other resources
• Our Solutions centre provides a number of longer technical articles.
• Our Opentalk forum archive provides a question and answer centre.
The Horse's mouth provides a daily tip or thought.
• Further resources are available via the resources centre.
• All of these resources can be searched through through our search engine
• And there's a global index here.

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This is a sample program, class demonstration or answer from a training course. It's main purpose is to provide an after-course service to customers who have attended our public private or on site courses, but the examples are made generally available under conditions described below.

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