classic example for lua OO

example_classic.lua

--[[
    example of using
    https://github.com/rxi/classic
]]

local Object = require("classic")
local Actor = Object:extend() -- new class

function Actor:new(id) -- ctor
    -- syntax little wonky to me here
    -- yourself.super gets to the parent
    -- class, then call with dot and pass self
    Actor.super.new(self)

    -- specific to this class
    self.id = id
end
function Actor:repr()
    return tostring(self.id)
end

local Player = Actor:extend()
function Player:new(name,id)
    -- Player.super is parent class
    -- new pass self and args
    Player.super.new(self,id)

    -- specific to this class
    self.name = name
end
function Player:repr()
    -- Player.super parent class
    -- call with dot
    local ts = Player.super.repr(self)
    ts = ts .. " " .. self.name
    return ts
end

-- instance of Actor
local a = Actor(10)
print(a:repr())

-- instance of Player
local p = Player("tony",20)
print(p:repr())

-- late mixin
local PairPrinterMixin = Object:extend()
function PairPrinterMixin:printPairs()
    for k,v in pairs(self) do
        print(k,v)
    end
end

Player:implement(PairPrinterMixin)
p:printPairs()