Lua Class Closure example

-- BaseObject.lua

BaseObject = {}

function BaseObject:new(x,y,width,height,world)

    local allYourBase = {}
    allYourBase.x = x
    allYourBase.y = y
    allYourBase.width = width
    allYourBase.height = height
    -- etc

    return allYourBase
end

return BaseObject

-- OrganicObject.lua

require "BaseObject"

OrganicObject = {}

function OrganicObject:new(x,y,width,height,world)
    local organic = BaseObject:new(x,y,width,height,world)
    organic.type = "organic"
    organic.growth = 0

    function organic:init()
        self.skinScale = (self.diagSize/self.diagStartSize)
    end

    return organic
end

return OrganicObject

-- Player.lua

require "OrganicObject"

Player = {}

function Player:new(x,y,width,height,world)
    local player = OrganicObject:new(x,y,width,height)

    player.oldInit = player.init
    function player:init()
        -- additional overwrode logic
        self:oldInit() -- call the super class' method
    end

    player:init()

    return player
end

return Player