How to detect when Variables change

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#1

I’m trying to do something like this:

local Variable = false
Variable.Changed:Connect(function()
	print('Variable has changed')
end)
wait(5)
Variable = true -- prints "Variable has changed"

I don’t want to run infinite loops or pack 100+ value objects into a folder, I searched around the forum, and other people either resorted to either of the 2 options or found no solutions.

#2

The best alternative I can think of is to store the variables in a module and then detect when one of the variables there is changed. Here is a reference to doing it

#3

You can do something like this but its not a variable its a table/metatable:

local callback
local container = {Variable = false}

do
	local temp = table.clone(container)
	container = {}

	local metatable = {
		__index = function(table, key)
			if key == "Changed" then
				local connection = {} 

				function connection:Connect(...)
					callback =...
				end

				return connection
			end

			return temp[key] 
		end,

		__newindex = function(table, key, value) 
			temp[key] = value
			callback(key, value)
		end
	} 

	setmetatable(container, temp) 
end

container.Changed:Connect(function(key, value)
	print(key, value) 
end)
#4

In Laymen’s terms, what is happening here what is the script doing?

#5

It checks if the container.Variable changed on:

#6

I see, but when I try this in the studio it gives out an attempt to index nil with ‘Connect’ error, why? And if I were to change the Variable what would I say?

#7

If you have just copied the code then you might need to double check for typo since I typed that on my phone.

#8

Yes I saw that and added the comma and it gave the error, I also tried to run the edited version of the script incase there is a difference but it gave the same error:
Screen Shot 2022-07-18 at 9.50.58 AM

#9

For what it’s worth, you shouldn’t do this unless you’re making a ModuleScript for someone else. Even then it’s debatable. You have full control over your own code and I advise making a function for this since you are reusing code.

local function changeVar(value)
    Var = value
    -- do stuff
end
#10

you could make a loop like this

local var = false
while task.wait() do 
   if var ~= false then
     Changedfunc()
     break
   end
end

and create a different thread for the loop if you cant do loops make 1 model and add attributes to that one model for each attribute and then check if the attribute changes.

#11

Interesting, but how safe are attributes when it comes to exploiters compared to value objects?

#12

Both of them are the same in the way they can be exploited.

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