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Lua - using modules to add your own utilities

Lua is a small language ... but that doesn't mean it lacks capabiities - it just means that you need to write some code yourself to implement simple utilities that you would cherry pick from huge libraries in other languages.

For example from this week's course, I've written functions to split a line and to read a file into a table of tables - it's [here]. Those functions can be loaded using a require and called up from multiple application programs - see [here] and [here].

Since Lua is a "default global" language, please note the declaration of internal variables to local within each function.

Although we're already in November, due to popular demand the current Lua course will be followed by yet another in the week of 14th December ...or if you're coming back to this article on the archive, see [here] for our current schedule.

N.B. original unsplit code is [here]
(written 2015-11-04, updated 2015-11-05)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
U109 - Lua - Modules
  [2455] Lua examples - coroutines, error handling, objects, etc - (2009-10-15)
  [2358] Encapsulating shared code in a Lua module - (2009-08-13)
  [1699] If you are learning Lua, here are some more examples - (2008-07-06)

U105 - Lua - Tables and the table library.
  [4273] Dot or Colon separator between table name and member in Lua - what is the difference? - (2014-05-06)
  [4248] Metatables, Metamethods, classes and objects in Lua - (2014-03-18)
  [3725] Lua Tables - (2012-05-10)
  [3694] Special __ methods you can use in Lua metatables - (2012-04-12)
  [2703] Lua Metatables - (2010-04-02)
  [2699] Lua tables - they are everything - (2010-03-30)
  [2499] ourdog is Greyhound, Staffie and Ginger Cake - (2009-11-09)
  [2346] The indexed and hashed parts of a Lua table - (2009-08-10)
  [1742] Lua - Table elements v table as a whole - (2008-08-07)
  [1697] Sorting in lua - specifying your own sort routine - (2008-07-05)


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Tables with values and code in Lua - looks like an object?
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Learning not just what a program does, but how to design it in the first place.
repeat until in Lua - a one or more rather than a zero or more loop
Classic style OO code - in Lua
Tables with values and code in Lua - looks like an object?
Lua - using modules to add your own utilities
A warm welcome awaits you at Well House Manor, Melksham
Lua - changes to how integers and floats are handled - 5.2 to 5.3
Moderation - and the tendency to over-moderate
Japanese and Malaysian food in Melksham
C - why is slow to write and debug) but fast to run?
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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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