Home Accessibility Courses Twitter The Mouth Facebook Resources Site Map About Us Contact
 
For 2021 - online Python 3 training - see ((here)).

Our plans were to retire in summer 2020 and see the world, but Coronavirus has lead us into a lot of lockdown programming in Python 3 and PHP 7.
We can now offer tailored online training - small groups, real tutors - works really well for groups of 4 to 14 delegates. Anywhere in the world; course language English.

Please ask about private 'maintenance' training for Python 2, Tcl, Perl, PHP, Lua, etc.
Lua - variable function arguments and select

Lua's select function allows you to look at the variable arguments to your current function. If you're going to be calling a function from different places with different numbers of parameters, you can declare the function with its final parameter being "..." which sucks up the final parameters into an indexed table. However, #... to find out how long the extra table is contravenes the syntax rules of Lua, and that's where select comes in.

Looking at the various Lua books and sources, there's very little on select - it's a bit of an obscure corner - so I've added a full source example - [here] - on our web site.

Remember that you can also pass named parameters into a function in the form of a table - that's done by calling the function with curly braces rather than round brackets. That's included within a somewhat more complex example [here].
(written 2010-09-08, updated 2010-09-14)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
U106 - Lua - Functions.
  [1685] Short circuit evaluation (lazy operator) in Lua - (2008-06-22)
  [1697] Sorting in lua - specifying your own sort routine - (2008-07-05)
  [1699] If you are learning Lua, here are some more examples - (2008-07-06)
  [1743] First class functions in Lua lead to powerful OO facilities - (2008-08-07)
  [1744] Lua examples, Lua Courses - (2008-08-08)
  [1847] Lua - IAQ (Infrequently Answered Questions) - (2008-10-18)
  [2312] What are closures in Lua? - (2009-07-31)
  [2347] Dot, dot, dot in Lua - variable length parameter lists - (2009-08-11)
  [2356] Passing multiple results back from a function - Lua, Python, etc - (2009-08-13)
  [2455] Lua examples - coroutines, error handling, objects, etc - (2009-10-15)
  [2723] Returning multiple values from a function - Lua - (2010-04-15)
  [3695] Functions are first class variables in Lua and Python - (2012-04-13)


Back to
Melksham shamefully makes the national headlines
Previous and next
or
Horse's mouth home
Forward to
Camilla, Duchess of Cornwall, turns first sod in Melksham Link Canal
Some other Articles
Turning an exercise into the real thing with extreme programming
Concluding the interview process
Lots of way of converting 3 letter month abbreviations to numbers
Camilla, Duchess of Cornwall, turns first sod in Melksham Link Canal
Lua - variable function arguments and select
Melksham shamefully makes the national headlines
Teaching Lua to a Perl advocate
Level playing fields, job vacancies, lemons and peaches
Last, final, etc
What others cannot do in 10 months takes Virgin 10 minutes
4759 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., 2021: 48 Spa Road • Melksham, Wiltshire • United Kingdom • SN12 7NY
PH: 01144 1225 708225 • EMAIL: info@wellho.net • WEB: http://www.wellho.net • SKYPE: wellho

PAGE: http://www.wellho.net/mouth/2949_Lua ... elect.html • PAGE BUILT: Sun Oct 11 16:07:41 2020 • BUILD SYSTEM: JelliaJamb