How to constantly update a table? (Short code)

Hey guys,

I'm trying to keep my t table constantly updated with the names of local slots (the names of slots are numbers from 1-4). I'm trying to constantly update the table only with names of slots inside which the User.Value == false otherwise don't include the name in the table if the User.Value == true. I hope you understand what I am trying to achieve, if not - Please feel free to ask me any question in the comments below this post.

My hierarchy: http://i.imgur.com/qExP1D1.png

My code:

while true do wait()
local t = {1, 2, 3, 4}
local slots = script.Parent.Parent.Slots:GetChildren()
local emptyslot = script.Parent.Value
	for i,v in pairs(slots) do
		if v.Used.Value == false then
			table.insert(t,tonumber(v.Name))
			number = (math.min(unpack(t)))
			emptyslot = number
		end
	end
end

So there are some "slots" and you want to get the lowest one that is unused?

local t = {} --start empty
local slots = script.Parent.Parent.Slots:GetChildren()
local emptyslot = script.Parent
for _,slot in pairs(slots) do
    if not slot.Used.Value then
        table.insert(t,tonumber(slot.Name))
    end
end
number = math.min(unpack(t))
emptyslot.Value = number --I think you want to set this value, not a variable

I recommend you put this in a function and calculate when you need it, or when things change, not constantly.