[Lua] Benchmark of table references

--[[
output:
------------------------
Control: 0.0090000000000146
Test A: 0.02349999999999
Test B: 0.1049
Test C: 0.1067
------------------------
conclusion: localize deeply nested variables before loop
--]]

local clock = os.clock

local this = { is = { a = { deep = { tbl = { dude = true } } } } }

-- Control group: empty for loop for comparison to Test A and B
local sum = 0
local itr = 0
repeat
    local before = clock()
    for i=1,1000000 do
    end
    sum = sum + (clock()-before)
    itr = itr + 1
until (itr == 10)
local test_control = sum/itr -- The average time


-- TEST A
sum = 0
itr = 0
repeat
    local is_a_dude = this.is.a.deep.tbl.dude
    local before = clock()
    for i=1,1000000 do
        if (is_a_dude == true) then

        end
    end
    sum = sum + (clock()-before)
    itr = itr + 1
until (itr == 10)
local test_a = sum/itr


-- TEST B
sum = 0
itr = 0
repeat
    local before = clock()
    for i=1,1000000 do
        if (this.is.a.deep.tbl.dude == true) then

        end
    end
    sum = sum + (clock()-before)
    itr = itr + 1
until (itr == 10)
local test_b = sum/itr

-- TEST C
sum = 0
itr = 0
repeat
    local before = clock()
    for i=1,1000000 do
        local is_a_dude = this.is.a.deep.tbl.dude
        if (is_a_dude == true) then

        end
    end
    sum = sum + (clock()-before)
    itr = itr + 1
until (itr == 10)
local test_c = sum/itr

print ("Control: "..test_control)
print ("Test A: "..test_a)
print ("Test B: "..test_b)
print ("Test C: "..test_c)