Iterating through table 1x1

Help and Feedback Scripting Support
#1

Hello, I’m trying to iterate through the keys of a table in a module script one by one when Q is pressed. However, output is printing nil.

Here’s the LocalScript:

local UserInputService = game:GetService("UserInputService")
local ReplicatedStorage = game:GetService("ReplicatedStorage")
local Module = require(ReplicatedStorage:FindFirstChild("ModuleScript"))

UserInputService.InputBegan:Connect(function(input, isTyping)
	if isTyping then return end
	
	local currentIndex = 1
	local Table = Module
	
	local function iterateTable()
		if currentIndex <= #Table then
			local value = Table[currentIndex]
			currentIndex = currentIndex + 1
			return value
		elseif currentIndex > #Table then
			currentIndex = 1
		end	
	end	
	
	
	if input.KeyCode == Enum.KeyCode.Q then
		
		local value = iterateTable()
		
		print(value)
		
		value = iterateTable()
		
		
	end
end)

Module Script:

local module = {
	["Idle"] = 1,
	["Active"] = 2,
	["Disabled"] = 3
}

return module
#2

The table inside of your module script has string keys, and you are trying to access the values inside of the table with an integer index. No values in your table have an integer index, so you get a nil value.
Try changing your module script to this instead:

local module = {
	"Idle",
	"Active",
	"Disabled"
}

return module

This way, Module[1] = “Idle”, Module[2] = “Active”, and Module[3] = “Disabled”.

#3

In your table variable you are just accessing your module script, not the actual table. You’re also using the module script wrong.

To make a global variable you wouldnt use the local keyword.

local Module = {}

Module.table = {“Variable1”, “Variable2”}

return Module

Then to use it in your local script you would use the Module keyword followed by the table name.

local moduleScript = require(ReplicatedStorage.ModuleScript)

print(moduleScript.table)

Obviously dont use table as a variable name as thats already a luau keyword but you get the idea.

#4

Found the problem, not obvious at all but #Table always returns 0 when it’s not an indexed table.
What I did to solve that problem was to write a function len(table) which would return the length of the table like this :

local function len(Table)
    local length = 0
    for i,v in Table do
        length += 1
    end
    return length
end
#5

Don’t believe this is the issue, yes you’re defining Module within the local scope, but you’re also returning, so that any script requiring it, returns the table.

This is basically the same thing, you’re just defining “table” in the Module table.
It’s not actually a global variable.

It’s just like when you declare a function in a module…

function Module.NamedFunction()

end

He’s directly defining the info in the module table, which is fine. But, as @DemGame pointed out, he’s incorrectly accessing the table.

And as well as @1_Lukeskyiwalker pointed out, he’s not finding the correct length with # and needs to use something similar/just like the function @1_Lukeskyiwalker gave.

1 Like