Cycling forwards and backwards in a table

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#1

Hello, I have a somewhat small question Today:

I have this script that’ll manage different “modes” a player can cycle through using Q and R. Q will move back and R will move forwards. The table has the name of all the modes while the order will indicate the order in which the player can switch to the next / previous mode.

How would I have the script know the current mode it’s on and move to the next / previous one if possible? I know that Table.Next exists but is there an inverse to this or is there a better way to approach this as a whole? Thanks for any help.

plr = game.Players.LocalPlayer
char = plr.Character or plr.CharacterAdded:Wait()
Sword = script.Parent.RiyetenSword
UIS  = game:GetService("UserInputService")

Mode = "None"

--Modes
Modes = {
	C1 = {Name = "Dreamcaster", Order = 1},
	C2 = {Name = "Fireclaw", Order = 2},
	C3 = {Name = "Guardian", Order = 3},
	C4 = {Name = "The Manual", Order = 4},
	C5 = {Name = "Console", Order = 5},
}

Sword.CanCollide = false
Sword.Parent = char
SW = Instance.new("WeldConstraint")
SW.Parent = char
SW.Part0 = char.Torso
SW.Part1 = Sword
Sword.Position = char.Torso.Position - Vector3.new(0,0,-0.5)

UIS.InputBegan:Connect(function(Key)
	if Key.KeyCode == Enum.KeyCode.Q then
		-- Stuff will happen here
	end
	
	if Key.KeyCode == Enum.KeyCode.R then
		-- Stuff will happen here
	end
end)
#2

Could you store a value of your current index and just add or minus from it?

1 Like
#3

Since there is an order to your table, I would recommend simply using an array, since the indexes are automatically numeric.

Ex: {"A", "B", "C"} = {[1] = "A", [2] = "B", [3] = "C"}

This way you can simply move around the table, like so:

local Modes = {
	{["Name"] = "Dreamcaster"}, --// Order is automatically 1
	{["Name"] = "Fireclaw"}, --// Order is automatically 2
	{["Name"] = "Guardian"}, --// Order is automatically 3
	{["Name"] = "The Manual"}, --// Order is automatically 4
	{["Name"] = "Console"}, --// Order is automatically 5
}

local function IterateTable(Table: table, StartingIndex: number, Increase: boolean)
	local MaximumIndex = #Table
	
	local NewIndex
	
	if Increase then
		if (StartingIndex + 1) > MaximumIndex then
			NewIndex = 1
		else
			NewIndex = StartingIndex + 1
		end
	else
		if (StartingIndex - 1) < 1 then
			NewIndex = MaximumIndex
		else
			NewIndex = StartingIndex - 1
		end
	end
	
	return Table[NewIndex]
end

IterateTable(Modes, 1, true) --> Returns {["Name"] = "Fireclaw"}
IterateTable(Modes, 4, true) --> Returns {["Name"] = "Console"}
IterateTable(Modes, 1, false) --> Returns {["Name"] = "Console"}
IterateTable(Modes, 3, false) --> Returns {["Name"] = "Fireclaw"}
#4

I believe that this works after implementing it, thank you both for your awnsers! One thing though, How would I print out the name of the current mode since “Name” is no longer a variable (atleast how I see it.)

#5

Extending from the code above, you could do

local Table1 = IterateTable(Modes, 1, true)
local Table2 = IterateTable(Modes, 4, true)
local Table3 = IterateTable(Modes, 1, false)
local Table4 = IterateTable(Modes, 3, false)

print(Table1["Name"]) --> "Fireclaw"
print(Table2["Name"]) --> "Console"
print(Table3["Name"]) --> "Console"
print(Table1["Name"]) --> "Fireclaw"
1 Like
#6

Worked perfectly! Got a few errors but I fixed them myself, Thanks again!

#7

Sorry to be a bother again, but after i’ve added the final stuff I’ve been trying to fix this issue when trying to print the names and I haven’t figured out why its happening.

Trying to print returns with nil

UIS.InputBegan:Connect(function(Key)
	if Key.KeyCode == Enum.KeyCode.E then
		local Final = IterateModes(Modes, CurrentMode.Value, true)
		print(Final["Name"])
	end
	
	if Key.KeyCode == Enum.KeyCode.Q then
		local Final = IterateModes(Modes, CurrentMode.Value, false)
		print(Final["Name"])
	end
end)

I basically tried to implement the answer provided but it has not worked. I’m assuming I need to return something but i’m unsure.

The cycle still works, but the script doesn’t know what the index is referring to (?)

#8

Based on what you are saying that the script does not know what the index is referring to, that means the issue is probably coming from:

What have you set this to mean (as far as I can see, in any of the code snippets, CurrentMode was never defined nor is it clear that it has a Value index)? For the IterateTable/IterateMode function, the second argument should be a number, representing the current index in the array. The function is then set to return something.

Could you post the complete code that you are working with right now?

#9

Ah, No worries, I resolved the issue by using a few values here and there, and works as intended, I’m still a bit wobbly on using tables and messed up somewhere. Thank you for clarifying, I’ll try to be more open minded before posting questions. Thanks and have a happy new year

#10

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