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 Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own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))
A fresh example - objects the Lua way
One of the requirements we often have in our web server log file analyses is to connect together a series of accesses from a single IP address into a "visit", and this formed an example on Tuesday's Lua course.
In Lua, you can overload (i.e. redefine) operators so that they work differently on tables of different types, and in this case I chose to redefine addition so that it concatenates two visits, allowing all the access log records from a single source to be logically grouped even though there are many different visitors (i.e. IP addresses) coming to our site at the same time:
(This diagram shows you just how wide ranging our visitors are - it's dynamic, showing you the last 15 minutes up to when you loaded the page!)
The log file analysis program comes several days into our Lua Programming course
so it's not practical for me to document every line here, but if you already know Lua, you're more than welcome to look at the calling code here
and the object definition here
. The latter contains a good block of comments! (written 2009-08-13)
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articlesU107 - Object Orientation - the Lua way 
Towards Object Oriented Programming in Lua - (2008-06-30) 
If you are learning Lua, here are some more examples - (2008-07-06) 
First class functions in Lua lead to powerful OO facilities - (2008-08-07) 
Calling base class constructors - (2008-10-03) 
For Lua Programmers AND for Town Planners - (2009-08-02) 
Lua examples - coroutines, error handling, objects, etc - (2009-10-15) 
Is Lua an Object Oriented language? - (2010-04-01) 
Lua Metatables - (2010-04-02) 
__index and __newindex in Lua - metatable methods - (2010-04-05) 
Private and Public - and things between - (2011-01-22) 
Tables as Objects in Lua - a gentle introduction to data driven programming - (2011-08-17) 
Metaclasses (Python) and Metatables (Lua) - (2011-11-17) 
Weak references in Lua - what are they, and why use them? - (2012-04-04) 
Special __ methods you can use in Lua metatables - (2012-04-12) 
Using Lua tables as objects - (2012-05-11) 
What is a metatable? How do I set one up? How do I use them? Lua - (2012-05-12) 
Is Lua an Object Oriented language? - (2013-06-15) 
Metatables, Metamethods, classes and objects in Lua - (2014-03-18) 
Dot or Colon separator between table name and member in Lua - what is the difference? - (2014-05-06) 
Tables with values and code in Lua - looks like an object? - (2015-11-05) 
Classic style OO code - in Lua - (2015-11-05) 
Lua, Tcl, Python, C and C++ courses - at our Melksham HQ or on your site - forward from July 2017 - (2017-07-02)
Some other Articles
Alpaca Case or Camel CaseThornham Farm Shop, Seend Cleeve, nr MelkshamGeocoding - converting address to latitude / Longitude with PHP via GoogleError Handling in Lua with assert and pcallA fresh example - objects the Lua wayEncapsulating shared code in a Lua moduleChecking if the user has entered a number (Lua)Passing multiple results back from a function - Lua, Python, etcSee this page in FrenchTraining, Open Source computer languages
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This is a page archived from The Horse's Mouth at
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