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table for data and functionallity
Object Orientation - the Lua way example from a Well House Consultants training course
More on Object Orientation - the Lua way [link]

This example is described in the following article(s):
   • Tables with values and code in Lua - looks like an object? - [link]

Source code: service_12 Module: U107
--[[
table for data and functionallity
]]


south = {cars=3,seats=78,time="06:38",destiny="Southampton"}
north = {cars=2,seats=75,time="07:19",destiny="Cheltenham Spa"}

-- Basics

bums = south["cars"] * south["seats"]
print ("Sitting to Soton ... " .. bums)

-- Just a shorter syntax for named table member

bums = north.cars * north.seats
print ("Sitting to Cheltenham ... " .. bums)

function capacity(of)
        local peeps = math.floor(of.cars * of.seats * 1.4)
        return peeps
end

-- calling a function on a table of data

takes = capacity(south)
print ("Capacity southwards ... " .. takes)

-- associating a function with the data table (adding it to table)

north.getCapacity = capacity
takes = north.getCapacity(north)
print ("Capacity northwards ... " .. takes)
-- better notation ... same action
takes = north:getCapacity()
print ("Capacity northwards ... " .. takes)

-- add getCapacity to the other train too and have a whole table of trains
south.getCapacity = capacity
services = {north,south}
for _,service in ipairs(services) do
        print("Can carry " .. service:getCapacity() .. " to " .. service.destiny)
end

-- If you wanna go west, tough, it's a bus!

west = {destiny="Bath Spa",seats=61,time="07:40"}
function buscapacity(whichbus)
        return whichbus.seats + 6 -- Always just 6 standing
end
west.getCapacity = buscapacity

-- add the bus to our services and give ALL capacities

services[#services+1] = west
print ("-------------------------------------")
for _,service in ipairs(services) do
        print("Can carry " .. service:getCapacity() .. " to " .. service.destiny)
end

--[[

WomanWithCat:ln15 grahamellis$ lua service_12
Sitting to Soton ... 234
Sitting to Cheltenham ... 150
Capacity southwards ... 327
Capacity northwards ... 210
Capacity northwards ... 210
Can carry 210 to Cheltenham Spa
Can carry 327 to Southampton
-------------------------------------
Can carry 210 to Cheltenham Spa
Can carry 327 to Southampton
Can carry 67 to Bath Spa
WomanWithCat:ln15 grahamellis$

]]

Learn about this subject
This module and example are covered on the following public courses:
 * Learning to program in Lua
 * Lua Programming
 * Lua Programming
Also available on on site courses for larger groups

Books covering this topic
Yes. We have over 700 books in our library. Books covering Lua are listed here and when you've selected a relevant book we'll link you on to Amazon to order.

Other Examples
This example comes from our "Object Orientation - the Lua way" training module. You'll find a description of the topic and some other closely related examples on the "Object Orientation - the Lua way" module index page.

Full description of the source code
You can learn more about this example on the training courses listed on this page, on which you'll be given a full set of training notes.

Many other training modules are available for download (for limited use) from our download centre under an Open Training Notes License.

Other resources
• Our Solutions centre provides a number of longer technical articles.
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This is a sample program, class demonstration or answer from a training course. It's main purpose is to provide an after-course service to customers who have attended our public private or on site courses, but the examples are made generally available under conditions described below.

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