For 2023 - we are now fully retired from IT training.
We have made many, many friends over 25 years of teaching about Python, Tcl, Perl, PHP, Lua, Java, C and C++ - and MySQL, Linux and Solaris/SunOS too. Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own risk.
Lisa and I (Graham) now live in what was our training centre in Melksham - happy to meet with former delegates here - but do check ahead before coming round. We are far from inactive - rather, enjoying the times that we are retired but still healthy enough in mind and body to be active!
I am also active in many other area and still look after a lot of web sites - you can find an index ((here))
Build up classes into applications sharing data types in Ruby
I've put together a "build-up" example showing code shared between multiple applications and using multiple classes in Ruby.
Start with stations.rb
which defines a railway station object and includes a factory to load a Hash of all UK stations. There's also a test program in there so that it can run stand-alone:
munchkin:lr grahamellis$ ruby stations.rb
Distance is 125.04
Distance is 125.04
Distance is 125.0
I then went on to add a (second) program that uses that class - see second
Another class is defined in journey.rb
and another program that uses both classes in third
... and so we could go on.
With all this build-up going on, the need for documentation of what's where becomes more important. You'll find the data file for the stations class on our website, but not the journey file as it contains personal information we can't put out in public. But we can show you and explain this program so YOU can be writing programs on our Ruby courses
. (written 2015-10-23)
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articlesR108 - Ruby - More Classes and Objects 
MTBF of coffee machines - (2005-01-20) 
Think about your design even if you don't use full UML - (2006-03-24) 
What are factory and singleton classes? - (2007-06-04) 
Some Ruby programming examples from our course - (2008-03-21) 
Object Orientation in Ruby - intermediate examples - (2009-07-16) 
Ruby - is_a? v instance_of? - what is the difference? - (2010-01-27) 
Ruby objects - a primer - (2010-01-29) 
Tips for writing a test program (Ruby / Python / Java) - (2010-01-29) 
Defining a static method - Java, Python and Ruby - (2010-02-01) 
Direct access to object variable (attributes) in Ruby - (2010-02-02) 
Object Oriented Ruby - new examples - (2010-02-03) 
The Multiple Inheritance Conundrum, interfaces and mixins - (2010-04-11) 
What is a factory method and why use one? - Example in Ruby - (2010-09-30) 
Ruby - examples of regular expressions, inheritance and polymorphism - (2010-10-02) 
Private and Public - and things between - (2011-01-22) 
Changing a class later on - Ruby - (2011-02-02) 
Ruby training - some fresh examples for string handling applications - (2011-02-05) 
Ruby - a training example that puts many language elements together to demonstrate the whole - (2011-04-23) 
Why you should use objects even for short data manipulation programs in Ruby - (2012-06-10) 
Private, Protected, Public in Ruby. What about interfaces and abstract classes in Ruby? - (2012-06-23) 
Standard methods available on all objects in Ruby - (2012-06-23) 
Changing what operators do on objects - a comparison across different programming languages - (2014-12-26) 
Where does Ruby load modules from, and how to load from current directory - (2015-06-03) 
Testing your new class - first steps with cucumber - (2015-10-23)
Some other Articles
Passing information into functions in C - by name, by valueRUby - loading, using, changing, storing JSON format dataScenario outlines - tables of values to test - in Gherkin / CucumberBuild up classes into applications sharing data types in RubyClarrissa-Marybelle - too long to really fit?Melksham - two small townships, or one big one?RUH Hopper - experience and thoughts forwardIs the RUH hopper a limited, duplicate service running unnecessarily and at high cost?Method, Class, Module, Package - how to they relate in Python?
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This is a page archived from The Horse's Mouth at
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