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Towards Object Oriented Programming in Lua

I've spent a lot of the weekend working on our Lua course ... and for those of you new to this language I'll be sharing a few snippets with you here on "The Horse's Mouth" over coming weeks. Today, I've got a short section which starts to introduce how you can do OO programming in Lua. The section of notes goes on to cover all the OO classics such as Encapsulation, Polymorphism and Inheritance and the course examples for this module are online via here

In Lua, we can keep functions in a table too, and we can bind a series of "metamethods" to a table which give it additional properties We also have syntactic sugar to make the new structures look and run sweetly. All of which leads to an effective Object Oriented capability in Lua, although without the classic keywords "class", "method", "private" etc.

Here are some of the basics - the use of the "." operator, and the storage of a piece of code as a first class function alongside the data.

stuff = {}
 
stuff["john"] = 14
stuff.dick = 24
function stuff.henry(value)
  return value * 2
  end
 
print (stuff.john)
print (stuff["dick"])
print (stuff.henry(16))
 
print (stuff["john"])


If you're trying to work out the difference between the "." operator and the use of a subscript in square brackets ... don't. They mean the same thing!

Here's how that program runs:

[trainee@easterton u107]$ lua dibdab
14
24
32
14
24
34
[trainee@easterton u107]$

(written 2008-06-30)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
U107 - Object Orientation - the Lua way
  [4753] Lua, Tcl, Python, C and C++ courses - at our Melksham HQ or on your site - forward from July 2017 - (2017-07-02)
  [4573] Classic style OO code - in Lua - (2015-11-05)
  [4572] Tables with values and code in Lua - looks like an object? - (2015-11-05)
  [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)
  [4117] Is Lua an Object Oriented language? - (2013-06-15)
  [3730] What is a metatable? How do I set one up? How do I use them? Lua - (2012-05-12)
  [3727] Using Lua tables as objects - (2012-05-11)
  [3694] Special __ methods you can use in Lua metatables - (2012-04-12)
  [3683] Weak references in Lua - what are they, and why use them? - (2012-04-04)
  [3524] Metaclasses (Python) and Metatables (Lua) - (2011-11-17)
  [3396] Tables as Objects in Lua - a gentle introduction to data driven programming - (2011-08-17)
  [3142] Private and Public - and things between - (2011-01-22)
  [2710] __index and __newindex in Lua - metatable methods - (2010-04-05)
  [2703] Lua Metatables - (2010-04-02)
  [2701] Is Lua an Object Oriented language? - (2010-04-01)
  [2455] Lua examples - coroutines, error handling, objects, etc - (2009-10-15)
  [2359] A fresh example - objects the Lua way - (2009-08-13)
  [2318] For Lua Programmers AND for Town Planners - (2009-08-02)
  [1819] Calling base class constructors - (2008-10-03)
  [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)


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July to December 2008 - Open Source training schedule
Towards Object Oriented Programming in Lua
Co-routines in Lua - co-operative processing
Conversion of c/r line ends to l/f line ends
Some sideways thoughts on the news
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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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