Paramater understanding help

Help and Feedback Scripting Support
#1

Im trying to understand how parameters work? Do they work like you send a value through them and then when you call it you can get the value?


local function updatedamg(idk) -- value want to be sent
	local Character = plr.Character or plr.CharacterAdded:Wait()
	local Axe = SearchForAxe(Character)
	local idk =	Axe:FindFirstChild("damage").Value
	print(idk.Value)
end

AddWoodEvent.OnServerEvent:Connect(function(Player) -- (A) Were you supposed to add "Wood" as a parameter
	local DamageValue = 0
	updatedamg(DamageValue) --value added to othervalue?
	if not DamageValue then warn("Axe has no damage value") return end

	local PlayerAxes = Player:WaitForChild("axes", 5)
	if not PlayerAxes then warn("Player has no axes") return end

	local twxWood = PlayerAxes:FindFirstChild("twxWood", 5)

	print(DamageValue)
	wood.Value += DamageValue * (twxWood.Value and 2 or 1) -- Multiply by 2 if twxWood, otherwise 1
	DamageValue = 0
end)

Please do not ask people to write entire scripts or design entire systems for you. If you can’t answer the three questions above, you should probably pick a different category.

#2

The parameters or arguments are just values passed into the function. They can have almost any name.

local function foo(arg1, arg2, arg3)
	return arg1 + arg2 - arg3
end

print(foo(1,2,3))

Output: 0
#3

Hw would I use paramaters in mu situation? And where would paramters be good to use in a different code?

#4

My advice would be to read the documentation on functions.

You pass in values of any kind into the function call. From there the function now has access to those values.

#5

ok so i would do something like this??

num1 = 0

local function add(num1)
      num1 = 2
end

script.Parent.Mousebutton1click:Connect(Function()
       num1 = add()
end)
#6

Close.

You want to put the parameter inside the function call.

add(num1)

#7

Ok so when i impliment this into my code it should work like this right? But it is warning “axe has no damage value”?

local function updatedamg(idk)
	local Character = plr.Character or plr.CharacterAdded:Wait()
	local Axe = SearchForAxe(Character)
	local idk =	Axe:FindFirstChild("damage").Value --finding the value
	print(idk)
end

AddWoodEvent.OnServerEvent:Connect(function(Player) -- (A) Were you supposed to add "Wood" as a parameter
	DamageValue = updatedamg(DamageValue) --add dmg
	if not DamageValue then warn("Axe has no damage value") return end

	local PlayerAxes = Player:WaitForChild("axes", 5)
	if not PlayerAxes then warn("Player has no axes") return end

	local twxWood = PlayerAxes:FindFirstChild("twxWood", 5)

	print(DamageValue)
	wood.Value += DamageValue * (twxWood.Value and 2 or 1) -- Multiply by 2 if twxWood, otherwise 1
	DamageValue = 0
end)
#8

When you pass variables to a subprogram, the value is passed - not the variable itself.

--quick example
local function something(parameter1)
    print(parameter1)
end

something(3) --outputs "3"

local var = 5
something(var) --outputs "5"

Basically, parametes are ways of passing useful informations to sub-programs that they can then use. Sorry this explanation is so brief.


Here’s a post I made about parameters:
Parameters

Here’s the documentation:
Using Parameters and Events | Documentation - Roblox Creator Hub

I hope these resources help. You are, in fact, already using parameters, for example in FindFirstChild!

1 Like
#9

Ok, i understand more now, but i think im setiting “damage value” to idk’s value. But damage value is printing nil?

local function updatedamg(idk: NumberValue) 
	local Character = plr.Character or plr.CharacterAdded:Wait()
	local Axe = SearchForAxe(Character)
	local idk =	Axe:FindFirstChild("damage").Value --getting idks value
	print(idk)
end

AddWoodEvent.OnServerEvent:Connect(function(Player)
	DamageValue = updatedamg(DamageValue) --setting the damage value to idks value
	print(DamageValue)
	if not DamageValue then warn("Axe has no damage value") return end

	local PlayerAxes = Player:WaitForChild("axes", 5)
	if not PlayerAxes then warn("Player has no axes") return end

	local twxWood = PlayerAxes:FindFirstChild("twxWood", 5)

	print(DamageValue)
	wood.Value += DamageValue * (twxWood.Value and 2 or 1) 
	DamageValue = 0
end)
#10

DamageValue is never being set in that script.

You have made what is called a procedure, it does not return a value. This means DamageValue comes out as nil, which means the asbence of data (e.g. nothing). You must add a return statement returning the value you want DamageValue to take.

#11

damage value is higher up in the code

local DamageValue = 0 --setting damage vllue

local function SearchForAxe(Container) -- Move local function outside of connection
	for _, Item in Container:GetChildren() do
		if not Item:IsA("Tool") or Item.Name ~= "Axe" then continue end
		return Item
	end
end

local function updatedamg(idk: NumberValue) 
	local Character = plr.Character or plr.CharacterAdded:Wait()
	local Axe = SearchForAxe(Character)
	local idk =	Axe:FindFirstChild("damage").Value
	print(idk)
end

AddWoodEvent.OnServerEvent:Connect(function(Player)
	DamageValue = updatedamg(DamageValue)
	print(DamageValue)
	if not DamageValue then warn("Axe has no damage value") return end

	local PlayerAxes = Player:WaitForChild("axes", 5)
	if not PlayerAxes then warn("Player has no axes") return end

	local twxWood = PlayerAxes:FindFirstChild("twxWood", 5)

	print(DamageValue)
	wood.Value += DamageValue * (twxWood.Value and 2 or 1) 
	DamageValue = 0
end)
#12

Like I said, this never returns a value, which means DamageValue will end up as nil (nothing).

Also try to avoid global variables to prevent future issues.

#13

so how would i make it return a value

#14

Simple: You just add a return statement to return the value you want. Here’s a brief example using addition:

local function add(n1, n2)
    local result = n1 + n2
    return result --send it back to whatever requested it
end

local sum = add(5, 7) --get the return result of the function and store it in "sum"
print(sum) --outputs "12"
2 Likes
#15

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