[Slakah]

Originally Posted by Aezay Is there any performance benefits in assigning multiple variables at the same times compared to one per line? tbl.name, tbl.value, tbl.color = name, value, color; tbl.name = name; tbl.value = value; tbl.color = color;

local clock = os.clock
local insert, sort = table.insert, table.sort

local orderednames = {}
local names = setmetatable({}, {__newindex = function(t, k, v)
    insert(orderednames, k)
    rawset(t, k, v)
end})

local function bench(name, func, ...)
    local start = clock()
    for i = 1, 1e7 do
        func(...)
    end
    names[name] = clock() - start
end

local function printresults()
    sort(orderednames, function(a, b)
        return names[a] < names[b]
    end)

    for i, v in pairs(orderednames) do
        print(string.format("%d  %s took %.5f secs", i, v, names[v]))
    end
end

local tbl = {}
tbl.cat, tbl.dog, tbl.cow, tbl.pig = "Meow", "Woof", "Moo", "Oink"


bench("1 line assign", function()
    tbl.cat, tbl.dog, tbl.cow, tbl.pig = "Meow", "Woof", "Moo", "Oink"
end)

bench("multi line assign", function()
    tbl.cat = "Meow"
    tbl.dog = "Woof"
    tbl.cow = "Moo"
    tbl.pig = "Oink"
end)

printresults()

I'm consistently getting these results

1  multi line assign took 11.77000 secs
2  1 line assign took 12.55000 secs

I can't explain it.