How to make a function yield until a requiment is met for it to continue?

[VakarisLDoE (MrFlawless)]

Hello, I need help with my project. I made a part that when touched by a player turns the clocktime to 0 (making it night time).

Here is the script:

local NightPart = script.Parent

function night()
	local Lighting = game:GetService("Lighting")
	Lighting.ClockTime = 0
	
end

NightPart.Touched:Connect(night)

Then, I made a light that shines brighter and brighter but I want it to only activate when the clocktime is 0 (when it’s night time). I am having issues, I am using a “repeat until” loop, but can’t figure out how to make the function pause an wait for the clocktime to be 0 to continue.

Here is the script:

local GlowingPart = script.Parent
local PointLight = GlowingPart.PointLight

local timeChange = 0.2
local BrightnessChange = 0.2

function Brightness()
	
	local Lighting = game:GetService("Lighting")
	if not Lighting.ClockTime == 0 then
		repeat 
			
		until Lighting.ClockTime == 0
	end
	

	for currentBrightness = 0, 20, BrightnessChange do
	PointLight.Brightness = currentBrightness
	task.wait(timeChange)
	end


end

Note: Script is not fully finished because I couldn’t find a way to make it wait till the clocktime is 0.

Can anyone assist me please?

[thom463s]

I don’t think anything was wrong with your script.
It’s just that the repeat loop didn’t have a wait.

local GlowingPart = script.Parent
local PointLight = GlowingPart.PointLight

local timeChange = 0.2
local BrightnessChange = 0.2

function Brightness()

	local Lighting = game:GetService("Lighting")
	if Lighting.ClockTime ~= 0 then
		repeat
			task.wait()
		until Lighting.ClockTime == 0
	end

	for currentBrightness = 0, 20, BrightnessChange do
		PointLight.Brightness = currentBrightness
		task.wait(timeChange)
	end
end

Brightness()

[VakarisLDoE (MrFlawless)]

That worked! Also, one more question, why can’t I use “not” here instead of the ~= sign?

Your script:

if Lighting.ClockTime ~= 0 then
		repeat
			task.wait()
		until Lighting.ClockTime == 0
	end

My script:

if not Lighting.ClockTime == 0 then
		repeat
			task.wait()
		until Lighting.ClockTime == 0
	end

[thom463s]

When you do not Lighting.ClockTime == 0, the code will assume that it’s actually (not Lighting.ClockTime) == 0 which will just compare a boolean with a number, which is probably also why the game thought the ClockTime was 0.

Doing this will fix it

if not (Lighting.ClockTime == 0) then -- this works

end

It also tells you why it doesn’t work when you hover over it.

[VakarisLDoE (MrFlawless)]

When you say that it is comparing a boolean and a number, do you mean that “(not Lighting.Clocktime)” will be either true or false and then we just have a 0, so that’s a number. If so, then how do you know if “(not Lighting.Clocktime)” is true or false. (I am assuming it’s true because you told me that the game thought the Clocktime was 0)

[thom463s]

It actually return false, you can test this for yourself via command bar.
This is also why it skipped the repeat loop and made the light lit up immediately.

[OniiSamaUwU (UwU)]

if not game.Lighting.ClockTime == 0 then

-- equivalent to
if (not game.Lighting.ClockTime) == 0 then

-- equivalent to
if false == 0 then

-- to fix
if not (game.Lighting.ClockTime == 0) then

-- or
if game.Lighting.ClockTime ~= 0 then

The reason why it is false because numbers are truthy values, and not true is false.

[VakarisLDoE (MrFlawless)]

Thanks, imma do this next time!