Lua OOP benchmark

benchmark.lua

-- This benchmark compares two ways of creating objects.
-- Output commonly seen on the Lua demo site:
--
-- Creation time:	0.16
-- Calling member function time:	0.11
-- Memory:	2868.8798828125
--
-- Creation time:	0.11
-- Calling member function time:	0.13
-- Memory:	1697.4736328125
--
-- Showing the second method definitely has the edge in
-- both speed and memory.

local clock = os.clock

local Fruit = function(self)

    self.weight = self.weight or 0
    self.color = self.color or "undefined"

    function self:eat()
        self.weight = 0
    end

    return self
end

local start = clock()

for i=1,100000 do
    local fruit = Fruit {}
end

print("Creation time:", clock() - start)

local fruit = Fruit {}
local start = clock()
for i=1,1000000 do
    fruit:eat()
end

print("Calling member function time:", clock() - start)

local fruits = {}

for i=1,10000 do
    fruits[i] = Fruit {}
end


collectgarbage("collect")
print("Memory:", collectgarbage("count"))


local funcs = {}
local meta = { __index = funcs }

function funcs:eat()
    self.weight = 0
end

local CreateFruit = function(self)
    self.weight = self.weight or 0
    self.color = self.color or "undefined"

    return setmetatable(self, meta)
end

local start = clock()

for i=1,100000 do
    local fruit = CreateFruit {}
end

print("Creation time:", clock() - start)


local fruit = CreateFruit {}
local start = clock()
for i=1,1000000 do
    fruit:eat()
end

print("Calling member function time:", clock() - start)

for i=1,10000 do
    fruits[i] = CreateFruit {}
end

collectgarbage("collect")
print("Memory:", collectgarbage("count"))