Learning Object Orientation in Perl through bananas and perhaps Moose

Perl has the most incredbible range of OO facilities (though at times it's overfeatured and a bit old fashioned / tricky to use). So yesterday I wrote a whole series of examples ... and then went on to explore Moose - a module which adds extra keywords and lets you define your classes in a shorter and somewhat more conventional way. See [here] for the moose series - this post introduces the standard facilities in a series of examples.

Bananas.

Our supplier for the hotel provides three types - best bananas, large bananas and small bananas ... "best" are priced per kg, "large" per fruit, and "small" per bunch ... which makes life interesting when we do stock controls and start looking at supply usage, but it did provide a very useful example for yesterday ...

Here are the examples

Setting up a package of hash references - [source]

How to bless the references and thus turn them into objects - [source] - First practical example

Notifying the caller of where errors are triggered in his code via carp, croak and confess - [source]

Use of the caller function to examine the stack frames - [source]

Base class, subclasses, inheritance - [source] First example that shows how we do polymorphism in Perl

How we can use the Universal superclass to find out what our object is / what it can do - [source] can lead to poor class design!

A factory method to construct objects indirectly - [source]

Perl 5's OO facilities are covered on our Perl for Larger Projects course - where we cover OO principles too as necessary. Moose can be introduced on private courses (it's a bit of an interim thing prior to Perl 6 though), or if you're on the public course let me know you would like to cover it and I'll run an extra session one evening.

(written 2010-12-21)

Associated topics are indexed under

P310 - Perl - Moose
  [3097] Making Perl class definitions more conventional and shorter - (2010-12-20)

P213 - Perl - Creating your own Classes
  [3059] Object Orientation in an hour and other Perl Lectures - (2010-11-18)
  [2969] What does blessing a variable in Perl mean? - (2010-09-24)
  [2877] Further more advanced Perl examples - (2010-07-19)
  [2834] Teaching examples in Perl - third and final part - (2010-06-27)
  [2169] When should I use OO techniques? - (2009-05-11)
  [1925] Introduction to Object Oriented Programming - (2008-12-06)
  [1864] Object Oriented Perl - First Steps - (2008-11-01)
  [1664] Example of OO in Perl - (2008-06-03)
  [1435] Object Oriented Programming in Perl - Course - (2007-11-18)
  [1320] Perl for Larger Projects - Object Oriented Perl - (2007-08-25)
  [983] Blessing in Perl / Member variable in Ruby - (2006-12-14)
  [975] Answering ALL the delegate's Perl questions - (2006-12-09)
  [246] When to bless a Perl variable - (2005-03-15)
  [227] Bellringing and Programming and Objects and Perl - (2005-02-25)

P218 - Perl - More Objects
  [3581] Perl - calls to methods that use => - what do they mean? - (2012-01-16)
  [3377] What do I mean when I add things in Perl? - (2011-08-02)
  [2972] Some more advanced Perl examples from a recent course - (2010-09-27)
  [2876] Different perl examples - some corners I rarely explore - (2010-07-18)
  [2811] Igloos melt in the summer, but houses do not - (2010-06-15)
  [2717] The Multiple Inheritance Conundrum, interfaces and mixins - (2010-04-11)
  [2651] Calculation within objects - early, last minute, or cached? - (2010-02-26)
  [2427] Operator overloading - redefining addition and other Perl tricks - (2009-09-27)
  [1949] Nuclear Physics comes to our web site - (2008-12-17)
  [1819] Calling base class constructors - (2008-10-03)
  [1665] Factory method example - Perl - (2008-06-04)
  [1217] What are factory and singleton classes? - (2007-06-04)
  [930] -> , >= and => in Perl - (2006-11-18)
  [831] Comparison of Object Oriented Philosophy - Python, Java, C++, Perl - (2006-08-13)
  [656] Think about your design even if you don't use full UML - (2006-03-24)
  [592] NOT Gone phishing - (2006-02-05)
  [588] Changing @INC - where Perl loads its modules - (2006-02-02)
  [531] Packages in packages in Perl - (2005-12-16)

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