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Python, Lua, Tcl, C and C++ training - public course schedule [here]
Private courses on your site - see [here]
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Classic style OO code - in Lua

Lua tables can hold not only data values, but also functions - those functions defining behaviours. See [here].

However, if you have a lot of tables (data items) all of which require the same code attached, that's not efficient and so you can set up a metatable - a subsidiary table of extra information - which can be shared between lots of tables. I've just introduced this concept on this week's course - my example is [here].

Taking a further step, a table named after a data type can be used to hold common code for that type in addition to the metatable, and that provides an ability to write something close to "classic" OO code in Lua:

  south = train.new(3,78,"06:42","Southampton")
  north = train.new(1,79,"07:48","Swindon")
  services = {north,south}
  for k,service in ipairs(services) do
    print(k,service)
    print(service:getCapacity())
  end


Full code, including implementation, [here]

We run Lua Courses for both newcomers to programming, and for those with prior programming experience. Public course run every few month in Melksham, Wiltshire, England (about 100 miles west of London), and if you have a group of delegates we can train you on site in many different countries.
(written 2015-11-05)

 
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)
  [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)
  [1692] Towards Object Oriented Programming in Lua - (2008-06-30)


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Tables with values and code in Lua - looks like an object?
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or
Horse's mouth home
Forward to
repeat until in Lua - a one or more rather than a zero or more loop
Some other Articles
An update - Melksham Link Canal and river
If it's Tuesday it must be Belgium?
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
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
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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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