Roblox Data Save

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local DataStore = game:GetService("DataStoreService"):GetDataStore("PlayerStats")

function playerAdded(plr)

  local stats = Instance.new("StringValue");
  stats.Parent = plr;
  stats.Name = "leaderstats";

  local cash = Instance.new("IntValue");
  cash.Parent = stats;
  cash.Name = "Cash";

  local usr = "user_" .. plr.userId;

  	DataStore:UpdateAsync(usr, function(oldValue)

	    local theNewValueYouWant = 0;

	    if (oldValue ~= nil) then
		    theNewValueYouWant = 0;
		end

		return theNewValueYouWant;
   end)

  cash.Value = DataStore:GetAsync(usr);
end

game.Players.PlayerAdded:connect(playerAdded);