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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]
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
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