Applying OOP to an actual model

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#1

I understand the basic structure for Roblox OOP, like this car class example:

local CarClass = {}
CarClass.__index = CarClass

function CarClass.new(Speed, CurrentFuel, MaxFuel)
     local self = setmetatable({}, CarClass)
     self.Speed = Speed
     self.CurrentFuel = CurrentFuel
     self.MaxFuel = MaxFuel
     return self
end

function CarClass:Refuel()
     self.CurrentFuel = self.MaxFuel
end

return CarClass

And I know you’d use separate ModuleScripts for objects that inherit from CarClass (as most tutorials show).

When I test it like this, it works fine in a script:

local CarClass = require(script.Parent.CarClass)

local Car = CarClass.new(5, 50, 100)
Car:Refuel()

But my issue is: How do I actually connect this to a real car model in Roblox?

Should I:

  • Add a new method like CarClass:Create() to build the car model?
  • Or should I include the model setup directly in the constructor?

And how do I:

  • Make the car move based on its Speed property?
  • Gradually decrease fuel while driving?
  • Stop movement when fuel hits zero?
  • Allow refueling to make the car drivable again?
  • Show the fuel remaining in the car on a GUI?

Basically, how do I link this OOP structure to a functional car model in the game?

#2

Take a look at this: The Binder Pattern – Ozzy's Blog

It depends on what you’re doing, but typically I’ll use a binder or create the instance inside of the constructor if it’s needed. Don’t add a new method unless that’s going to have a good use.

Making the functionality work is just all code, so if you understand OOP that should be easy

1 Like
#3

What i do is include the model in the constructor (car.new) then I just write what the functions needs to do to the model in the methods. For example, lets say you have a linear velocity or something moving the car, you would change its vector velocity based on the speed value.