How would I create an custom function for objects (Instance:IncrementAttribute() for example)

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#1

Hello! I am currently wondering how it would be possible to use my current function:

local function IncrementAttribute(InstanceLocation, AttributeName, Incremented)
	InstanceLocation:SetAttribute(AttributeName, InstanceLocation:GetAttribute(AttributeName) + Incremented)
end

And do something like this:

InstancePart:IncrementAttribute("SwordDamage", 4)

Instead of

IncrementAttribute(InstancePart, "SwordDamage", 4)

If you can help, please let me know. Thanks! WE

#2

You would want to wrap the instances. What I mean by wrap is provide an interface that you would interact with to interact with your instance.

#3

Wait what would I do? I am very confused by wrapping? Are you talking about

coroutine.wrap

?

#4

No I’m talking about constructing proxy instances which you interact with instead of interacting with the original object.

Here is an elementary wrapping function:

local function Wrap(Object, Interface)
    local Proxy = newproxy(true)
    local Meta = getmetatable(Proxy)

    function Meta:__index(Key)
        return Interface[Key] or Object[Key]
    end

    function Meta:__newindex(Key, Value)
        Object[Key] = Value
    end

    return Proxy
end

I could use this to wrap Workspace to give the interface of being a “SwagObject” and a “Workspace”

local SwagObject = {
    SwagFactor = 9999,
    WaffleCount = 123,
    PhD = "Kitten Sciences"
}

local Workspace = Wrap(game.Workspace, SwagObject)

print(Workspace.SwagFactor, Workspace.WaffleCount, Workspace.Gravity)

9999 123 196.2

#5

This would not be worth using in my opinion because this would be extra code than all of the :IncrementAttribute()'s I would use in 1 script. Thanks anyway.

#6

The point of making a complex wrapping function was so you could introduce more complex behavior later on.

This is all syntactic sugar though and honestly don’t worry over it.

#7

You can use OOP (Object Oriented Programming) and ModuleScripts to achieve this.

local Module = {}

Module.__index = Module

function Module.new()
local NewModule = setmetatable({}, Module)
NewModule.RandomVariable = 5
return NewModule
end

function Module:PrintVariable()
print(self.RandomVariable)
end

return Module

Server Script

local OOP = require(script.OOP)
local OOPClass = OOP.new()

OOPClass:PrintVariable() -- Prints 5
1 Like
#8

Ok. How would I increment an attribute with OOP’s.

#9

Do something like the PrintVariable example.

local Module = {}

Module.__index = Module

function Module.new()
local NewModule = setmetatable({}, Module)
NewModule.RandomVariable = 5
return NewModule
end

function Module:IncrementAttribute(InstanceLocation, AttributeName, Incremented)
   InstanceLocation:SetAttribute(AttributeName, InstanceLocation:GetAttribute(AttributeName) + Incremented)
end
1 Like
#10

Ok. Quick question. What is RandomVariable used for?

#11

It’s not used for anything, you can exclude it. I was just giving you an example on OOP and how to use self

1 Like
#12

So technically, I don’t need .new at all? I can just remove it?

And also, I would just do :IncrementAttribute like in the example on the topic?

Sorry, I only use Modules for storing info. Havent used them in a while since Attributes are a thing now.

#13

The .new() function is made to make a ‘subclass’ in the Module, and making a new ‘subclass’ from the blueprint. Technically you can remove it, I guess.

And yes, I believe you would.

#14

Hey! Got this error when requiring the Module:
image

local AttributeService = require(game.ReplicatedStorage:WaitForChild("AttributeService"))

I promise that the module exists in the area.
image

If needed, here is the modules code. 
local Module = {}

Module.__index = Module

function Module:IncrementAttribute(InstanceLocation, AttributeName, Incremented)
	local IncrementedAttribute = InstanceLocation:SetAttribute(AttributeName, InstanceLocation:GetAttribute(AttributeName) + Incremented)
	return IncrementedAttribute
end
#15

You forgot to type return Module at the end.

#16

Wait, where would I return the module? Which script? I am guessing the ModuleScript right? But where in it?

Edit: Wait nvm

#17

Ok. Now I get this error.
image

Player.InventoryData:IncrementAttribute("CurrentItems", 1)
#18

Instead of Module:IncrementAttribute() in the module script, try self:IncrementAttribute

1 Like
#19

image
Wait so it comes up as an unknown global when I enter it.

function self:IncrementAttribute(InstanceLocation, AttributeName, Incremented)

Sorry, as I said before, I used modules for info storing before Attributes.

#20

Wait, nevermind. That wouldn’t work. Please show me your code (Script, not module)