How is composition achieved?

[Guest9132342]

What is the best method and what do u guys do?

1) Give the object keys that refrence to classes its composed of:

function Car.new(properties)
   local NewCar = setmetatable(properties, {__index = Car})
   NewCar.Wheels = Wheels.New()
   NewCar.Engine = Engine.new()
   return NewCar
end

2) Make the class composed of components:

local Components = {Classes}
local Car = setmetatable({}, {__index = function(t, k)
   local m 
   for _, Component in Components do
       if Component[k] then 
           m = Component[k]
           break
       end
   end
   return m
end)

• Option 1
• Option 2

[Doomcolp (dxxmed)]

I personally use Option 1.

Option 2 doesn’t look appealing to the eye (at least for me). I’d rather take Option 1.

[Guest9132342]

Thinking about it in hindsight, the second option seems more like multiple inheritance as the methods of the components are being set as the methods for the object, where the first option is moreso composition as u are creating a whole new component key in the object

[Guest9132342]

Second option is literally just multiple inheritance, sorry if i confused anyone.