How would I go about creating rng?

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#1

So basically, I’m trying to make a script where it would read chances for a certain item, create a random number and if the chances match up give the player that item, However I kinda realize that since I want to have multiple items have the same chance, and another thing is how would i really determine if the item is item 1 or item 2 if item 1 has a chance of 10%, item 2 has a chance of 5% but the random number is 7.5%, this probably isn’t the best way to go about things.

So does anybody know how I would go about creating rng?

1 Like
#2

I have created something similar to this where items and chances are stored inside a script in a table. If you want, you may have a look at it to get an idea of what to do. My coding might be messy though. This code is meant for a tool, but you can repurpose it if you want.

local itemPool = { -- Name the string to your item name, and the number to the chance
	["SuperRareItem"] = 50, -- 1/50 or 2% chance
	["CommonItem"] = 2 -- 1/2 or 50% chance
} -- Items are held in ServerStorage under "Items"
local tool = script.Parent

tool.Activated:Connect(function()
	for item,value in pairs(itemPool) do
		local random = math.random(value)
		if random == value then
				print(tostring(random).." hit on "..item)
				local cloneItem = game:GetService("ServerStorage").Items:FindFirstChild(item):Clone()
				cloneItem.Parent = game:GetService("Players"):GetPlayerFromCharacter(tool.Parent).Backpack
		else
			print(tostring(random).." did not hit "..item)
		end
	end
end
#3

So I managed to make this code work, however one issue with it is that it is never 100% guaranteed that the player will get an item, which is kind of a problem.

#4 
local itemPool = { -- Name the string to your item name, and the number to the chance
	["SuperRareItem"] = 50, -- 1/50 or 2% chance
	["CommonItem"] = 1
} -- Items are held in ServerStorage under "Items"
local tool = script.Parent

tool.Activated:Connect(function()
	for item,value in pairs(itemPool) do
		local random = math.random(value)
		if random == value or value == 1 then
			print(tostring(random).." hit on "..item)
			local cloneItem = game:GetService("ServerStorage").Items:FindFirstChild(item):Clone()
			cloneItem.Parent = game:GetService("Players"):GetPlayerFromCharacter(tool.Parent).Backpack
		else
			print(tostring(random).." did not hit "..item)
		end
	end
end)

Try this out.

#5

So, another issue with this code would be if there were multiple common items one would always get prioritized over the other, however I can figure that one out on my own, I appreciate all of your help, thank you!