OOP concept

local _M = {} -- module table

_M.someProperty = 1 -- class properties

local function createText()
   -- local function are still valid, but not seen from outside - "private"
end

local privateVar -- so do local variables

_GLOBAL_VAR -- without local it's global

function _M.staticMethod(vars)
    -- this is class method like function (dot)
    -- there is no "self"
end

function _M:someMethod(vars)
    -- this is object method like function (colon)
    -- there is "self"
end

function _M:newBaseObject()
    -- Here goes constructor code
    local object = display.newImage(...) -- could be a display object or an empty table {}
    object.vars = 'some vars'
    object.name = 'BaseObject'
    object.property = self.someProperty -- from module

    function object:sign(song)
        print(self.name .. ' is singing ' .. song)
    end


    function object:destroy()
       -- optional destructor, you can override removeSelf() as well
       self.vars = nil
       self:removeSelf()
    end

    return object
end

-- Now inheritance
function _M:newChildObject()
    local object = _M:newBaseObject()
    -- override any methods or add new
    object.name = 'ChildObject'
    function object:tell(story)
        print(self.name .. ' is telling ' .. story)
    end
    return object
end

return _M -- return this table as a module to require()