I need help understand this roblox crossraods opensource script

[GE_0E]

so i was reading the uncopylocked Classic: Crossroads - Roblox by roblox and i saw some things that i havnot seen in luau before

the whole script

print("Leaderboard script version 3.00 loaded")


function onPlayerEntered(newPlayer)


	local stats = Instance.new("IntValue")
	stats.Name = "leaderstats"

	local kills = Instance.new("IntValue")
	kills.Name = "KOs"
	kills.Value = 0

	local deaths = Instance.new("IntValue")
	deaths.Name = "Wipeouts"
	deaths.Value = 0

	kills.Parent = stats
	deaths.Parent = stats

	-- VERY UGLY HACK
	-- Will this leak threads?
	-- Is the problem even what I think it is (player arrived before character)?
	while true do
		if newPlayer.Character ~= nil then break end
		wait(5)
	end

	local humanoid = newPlayer.Character.Humanoid

	humanoid.Died:connect(function() onHumanoidDied(humanoid, newPlayer) end )

	-- start to listen for new humanoid
	newPlayer.Changed:connect(function(property) onPlayerRespawn(property, newPlayer) end )


	stats.Parent = newPlayer

end

function Send_DB_Event_Died(victim, killer)
	-- killer may be nil
	local killername = "no one"
	if killer ~= nil then killername = killer.Name end
	print("DIED EVENT: ", victim.Name, " KILLED by ", killername)

	if shared["deaths"] ~= nil then 
		shared["deaths"](victim, killer)
		print("SENT DB DEATH EVENT")
	end
end

function Send_DB_Event_Kill(killer, victim)
	print("KILL EVENT. ", killer.Name, " BLOXXED ", victim.Name)
	if shared["kills"] ~= nil then 
		shared["kills"](killer, victim)
		print("SENT DB KILL EVENT")
	end
end



function onHumanoidDied(humanoid, player)
	local stats = player:findFirstChild("leaderstats")
	if stats ~= nil then
		local deaths = stats:findFirstChild("Wipeouts")
		deaths.Value = deaths.Value + 1

		-- do short dance to try and find the killer

		local killer = getKillerOfHumanoidIfStillInGame(humanoid)


		Send_DB_Event_Died(player, killer)
		handleKillCount(humanoid, player)
	end
end

function onPlayerRespawn(property, player)
	-- need to connect to new humanoid
	
	if property == "Character" and player.Character ~= nil then
		local humanoid = player.Character.Humanoid
			local p = player
			local h = humanoid
			humanoid.Died:connect(function() onHumanoidDied(h, p) end )
	end
end

function getKillerOfHumanoidIfStillInGame(humanoid)
	-- returns the player object that killed this humanoid
	-- returns nil if the killer is no longer in the game

	-- check for kill tag on humanoid - may be more than one - todo: deal with this
	local tag = humanoid:findFirstChild("creator")

	-- find player with name on tag
	if tag ~= nil then
		
		local killer = tag.Value
		if killer.Parent ~= nil then -- killer still in game
			return killer
		end
	end

	return nil
end

function handleKillCount(humanoid, player)
	local killer = getKillerOfHumanoidIfStillInGame(humanoid)
	if killer ~= nil then
		local stats = killer:findFirstChild("leaderstats")
		if stats ~= nil then
			local kills = stats:findFirstChild("KOs")
			if killer ~= player then
				kills.Value = kills.Value + 1
				
			else
				kills.Value = kills.Value - 1
				
			end
			Send_DB_Event_Kill(killer, player)
		end
	end
end

game.Players.ChildAdded:connect(onPlayerEntered)

those are what i donot understand

humanoid.Died:connect(function() onHumanoidDied(humanoid, newPlayer) end )

newPlayer.Changed:connect(function(property) onPlayerRespawn(property, newPlayer) end )

humanoid.Died:connect(function() onHumanoidDied(h, p) end )

1 why did roblox use a function inside a function
2 the called function wasnot defined before how does it even not give error??
3 isnot that weird or i just think that?

any help is appreciated

[oOmekooOo (goot)]

1. I think roblox uses functions inside of functions like that so that they can pass the newPlayer property into the function, because if they connected it directly then they wouldn’t be able to

2. Since the called function, for example, onHumanoidDied wasn’t defined as local it means that it is a global function and it can be called from anywhere, even before it is defined in code

3. I agree that it is pretty weird to use global functions like that, and it’s not good practice to either

hope this helps

[GE_0E]

thanks for your reply it really helped
i forgot that global functions/variables exist lol