simpleoo.lua

local Prototype = {}
local Prototype_mt = {__index = Prototype}

function Prototype.do_stuff(times)
  -- Do stuff
end

function Prototype:new()
    local new_inst = {}                    -- the new instance
    setmetatable( new_inst, Prototype_mt ) -- all instances share the same metatable
    return new_inst
end

Prototype:new():do_stuff(10)