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)

 U107 - Object Orientation - the Lua way
  [1692] Towards Object Oriented Programming in Lua - (2008-06-30)
  [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)
  [1819] Calling base class constructors - (2008-10-03)
  [2318] For Lua Programmers AND for Town Planners - (2009-08-02)
  [2359] A fresh example - objects the Lua way - (2009-08-13)
  [2455] Lua examples - coroutines, error handling, objects, etc - (2009-10-15)
  [2701] Is Lua an Object Oriented language? - (2010-04-01)
  [2703] Lua Metatables - (2010-04-02)
  [2710] __index and __newindex in Lua - metatable methods - (2010-04-05)
  [3142] Private and Public - and things between - (2011-01-22)
  [3396] Tables as Objects in Lua - a gentle introduction to data driven programming - (2011-08-17)
  [3524] Metaclasses (Python) and Metatables (Lua) - (2011-11-17)
  [3683] Weak references in Lua - what are they, and why use them? - (2012-04-04)
  [3694] Special __ methods you can use in Lua metatables - (2012-04-12)
  [3727] Using Lua tables as objects - (2012-05-11)
  [3730] What is a metatable? How do I set one up? How do I use them? Lua - (2012-05-12)
  [4117] Is Lua an Object Oriented language? - (2013-06-15)
  [4248] Metatables, Metamethods, classes and objects in Lua - (2014-03-18)
  [4273] Dot or Colon separator between table name and member in Lua - what is the difference? - (2014-05-06)
  [4572] Tables with values and code in Lua - looks like an object? - (2015-11-05)
  [4753] Lua, Tcl, Python, C and C++ courses - at our Melksham HQ or on your site - forward from July 2017 - (2017-07-02)

Back to Tables with values and code in Lua - looks like an object?

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Forward to repeat until in Lua - a one or more rather than a zero or more loop

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