Home Accessibility Courses Twitter The Mouth Facebook Resources Site Map About Us Contact
 
Python, Lua, Tcl, C and C++ training - public course schedule [here]
Private courses on your site - see [here]
Please ask about maintenance training for Perl, PHP, Java, Ruby, MySQL and Linux / Tomcat systems
 
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
  [4571] Lua - using modules to add your own utilities - (2015-11-04)
  [2455] Lua examples - coroutines, error handling, objects, etc - (2009-10-15)
  [1699] If you are learning Lua, here are some more examples - (2008-07-06)


Back to
Checking if the user has entered a number (Lua)
Previous and next
or
Horse's mouth home
Forward to
A fresh example - objects the Lua way
Some other Articles
Thornham Farm Shop, Seend Cleeve, nr Melksham
Geocoding - converting address to latitude / Longitude with PHP via Google
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
4755 posts, page by page
Link to page ... 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96 at 50 posts per page


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.

Link to Ezine home page (for reading).
Link to Blogging home page (to add comments).

You can Add a comment or ranking to this page

© WELL HOUSE CONSULTANTS LTD., 2017: 404 The Spa • Melksham, Wiltshire • United Kingdom • SN12 6QL
PH: 01144 1225 708225 • EMAIL: info@wellho.net • WEB: http://www.wellho.net • SKYPE: wellho

PAGE: http://www.wellho.net/mouth/2358_Enc ... odule.html • PAGE BUILT: Sat May 27 16:49:10 2017 • BUILD SYSTEM: WomanWithCat