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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 Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own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))

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Lua module U198
New in Lua 5.2
Exercises, examples and other material relating to training module U198. This topic is presented on public courses Learning to program in Lua, Lua Programming, Lua Programming

Realease 5.2 of Lua includes a number of enhancements which are included in this module. This module will be included in course notes as a separate section, but the material is covered thoughout the course in an appropriate way for the particular requirements of the delegate group.
Articles and tips on this subjectupdated
3690Changes in Lua 5.2 - Garbage Collection
The garbage collection changes aren't coding changes - they will effect the internal efficiency and fix some issues there. Ephemeron tables are somewhat linked as they're providing a solution to a garbage collection issuse that required solution. There's a change to a generational collector at some ...
3686The goto statement in Lua
In the past there was considerable debate in academia and industry on the merits of the use of goto statements, and indeed Lua didn't have them until release 5.2. Well used in Lua, they can provide an escape from inner loops, jumping to a label using a ::label:: format. For example:   for ...
3683Weak references in Lua - what are they, and why use them?
In programming languages where memory is allocated dynamically (that applies to most of the languages we teach), there has to be a mechanism to gather up memory that is no longer used as the program is running so that it can be re-allocated later within the same program, and that mechanism is usually ...
3687Binary / bitwise operations in Lua with the standard bit32 library
If you want to do bit manipulation in Lua, you can use the bit32 library (which is loaded as a table) from Lua 5.2, and it's backported to newer Lua 5.1 versions as well. Bit manipulation is particularly useful in applications where data is packed into a series of bytes - in effect an array of booleans. Let's ...
Examples from our training material
bitwise   The bit32 library
gotolua   Lua goto - introduced in 5.2
wrt   Weak references - set up and practical use
Background information
Some modules are available for download as a sample of our material or under an Open Training Notes License for free download from [here].
Topics covered in this module
Yieldable pcall and metamethods.
Lexical scheme for globals.
Ephemeron tables.
Library for bitwise operations.
Light C functions.
Emergency garbage collector.
Goto statement.
Finalizers for tables.
Complete learning
If you are looking for a complete course and not just a information on a single subject, visit our Listing and schedule page.

Well House Consultants specialise in training courses in Ruby, Lua, Python, Perl, PHP, and MySQL. We run Private Courses throughout the UK (and beyond for longer courses), and Public Courses at our training centre in Melksham, Wiltshire, England. It's surprisingly cost effective to come on our public courses - even if you live in a different country or continent to us.

We have a technical library of over 700 books on the subjects on which we teach. These books are available for reference at our training centre.

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