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Lua - IAQ (Infrequently Answered Questions)

Here are a handful of "one line" answers from the end of the Lua Course I was running at the end of last week

• Command line parameters in Lua are available to the program in an indexed table called arg. (Sample Program)

• Functions in Lua can look at the number and type of parameters they're called with, and can behave differently depending on what they find (Sample program showing a function that can be called with two numbers OR one table as parameters)

• Although Pattern Matching does NOT use regular expressions in Lua, it does use many of the same principles - anchors, literal characters, groups and counts. And it can provide much of the same power but in a far smaller package! (Sample program showing how a postcode is matched and vital sections extracted)

• You can find out what is in a module by looping through its table keys - because (I'm sure you've not forgotten!) everything is a table in Lua (Sample program that lists out everything in the OS module)

You'll find many more sample programs, tips and techniques in our Lua Index. If you start with our Introduction to Lua module page, you'll find some basics. And then down the right hand side of that page, you'll find links to other groups of Lua resources such as Pattern Matching and Combining Lua and C in the same program.
(written 2008-10-18, updated 2008-11-02)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
U106 - Lua - Functions.
  [3695] Functions are first class variables in Lua and Python - (2012-04-13)
  [2949] Lua - variable function arguments and select - (2010-09-08)
  [2723] Returning multiple values from a function - Lua - (2010-04-15)
  [2455] Lua examples - coroutines, error handling, objects, etc - (2009-10-15)
  [2356] Passing multiple results back from a function - Lua, Python, etc - (2009-08-13)
  [2347] Dot, dot, dot in Lua - variable length parameter lists - (2009-08-11)
  [2312] What are closures in Lua? - (2009-07-31)
  [1744] Lua examples, Lua Courses - (2008-08-08)
  [1743] First class functions in Lua lead to powerful OO facilities - (2008-08-07)
  [1699] If you are learning Lua, here are some more examples - (2008-07-06)
  [1697] Sorting in lua - specifying your own sort routine - (2008-07-05)
  [1685] Short circuit evaluation (lazy operator) in Lua - (2008-06-22)

U108 - Lua - Pattern matching
  [4366] Changing what operators do on objects - a comparison across different programming languages - (2014-12-26)
  [3687] Binary / bitwise operations in Lua with the standard bit32 library - (2012-04-06)
  [2727] Making a Lua program run more than 10 times faster - (2010-04-16)
  [2702] First and last match with Regular Expressions - (2010-04-02)
  [2383] Lua Regular Expressions - (2009-08-28)

U112 - Lua - Other Standard Library features.
  [2951] Lots of way of converting 3 letter month abbreviations to numbers - (2010-09-10)

U118 - Lua - Resources.
  [2319] Graphics in Lua - an example using the gd library - (2009-08-02)
  [1695] Lua Course - here is the index - (2008-07-03)
  [1111] Training in Lua - (2007-03-16)


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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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