How to make a function run once and never again?

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#1

Okay, I am working on a game which includes an NPC that if you collect for example 10 coins, you get 200 diamonds. How do I make it so you can only complete the mission and if you come back again in another server and also the same server, it runs a different function, like: 'print(“Already completed”) and never lets you complete the mission again on the same account.

Any help is appreciated, thanks in advance.

#2

Use Datastoreservice.
Store the data to the player if the quest is completed.

#3

Yes, but I want to make it so they cannot comeplete the mission again.

#4

DatastoreService is a good thing to use this because if not they can just leave and rejoin, and start the task over again.

Less laggy when a user is leaving
Use GlobalDataStore | Roblox Creator Documentation and make the key to the gameId so it will only need to load all of the people in 1 datastore

Mostly laggy sometimes not when user is leaving
DatastoreService is accurate because it you don’t have to script too much i guess??

I never used :GetGlobalDatastore() so i never know how to use it, sorry.

#5 
local used = false

local function giveCoins()
	if used then --if used is true (if used) and the function is called then abruptly end the function
		return
	end
	local used = true
	print("Hello world!")
	--perform code here
end

giveCoins() --Hello world! is printed
giveCoins() --nothing happens

If this doesn’t need to persist across multiple server instances then you can simply use the logic as exemplified in the above in order to define a function of which its body (code content) can only be executed once.

2 Likes
#6

Well, I’m using it for a one-time quest.