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For 2023 (and 2024 ...) - 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 Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own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))
Encapsulating shared code in a Lua module

Have you ever written code like this?

seps = {" "," "," [",'] "','" '," ",' "','" "','"'}

Yes, I have ... in fact, that's code that I wrote on Tuesday during the Lua course; it's an indexed table of the separators used to split down a web access log record that's in the apache httpd combined format.

Am I proud of it?

Not really ... in fact, coding it in front of my delegates, I got it wrong initially and we had to go back and look very carefully at the single and double quotes. BUT once I got it right, it works well enough and there are sufficient comments around for it to be debugged if need be. Having said that, I would rather like to hide it under the carpet, and avoid it tripping up anyone else who stumbles across it.

Firstly - I put the code into a function so that it's lightly wrapped (see here) and can be called / prodded / used without the user being fearful of upsetting the code if he/she cuts and pastes it.

Then, I put the code into a separate module. That's a far heavier wrapping, using a table as a fresh namespace, and leaving only the names of the elements in the table / module / namespace visible to the calling file. The module source code is here and the source of a sample calling program is here
(written 2009-08-13)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
U109 - Lua - Modules
  [1699] If you are learning Lua, here are some more examples - (2008-07-06)
  [2455] Lua examples - coroutines, error handling, objects, etc - (2009-10-15)
  [4571] Lua - using modules to add your own utilities - (2015-11-04)


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Thornham Farm Shop, Seend Cleeve, nr Melksham
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Error Handling in Lua with assert and pcall
A fresh example - objects the Lua way
Encapsulating shared code in a Lua module
Checking if the user has entered a number (Lua)
Passing multiple results back from a function - Lua, Python, etc
See this page in French
Training, Open Source computer languages
All change - Wiltshire Parliamentary
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This is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.

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