Nested function return value of outside function

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#1

So I have two event handling issues where there is a nested function like so:

local function foo()
    local function baz()
        return -- I want this function to also return or break foo()
    end
end

But as expected, it terminates baz() which is completly useless because the point of baz() is to stop foo() from running. How can I terminate foo() using baz()?

1 Like
#2

So what you’re asking is how to terminate the foo() thread by using the function baz()?
If thats so,

local function foo()
    local function baz()
        return -- some value
    end
    return baz() -- doing this will just return the value that was returned by baz(), ultimately breaking the function
end
#3

I don’t think that’s what OP means. What you’ve done is have foo return the value that baz returns. I think what OP wants is for baz to stop the foo function at any given time. I’d say it depends on what’s happening in foo. You could have a condition like

local function foo()
    local done = false
    local function baz()
        done = true
    end
    baz()
    while not done do
        RunService.Heartbeat:Wait()
    end
end

But all that’s doing is busy waiting and foo could have something else it needs to do. Another option would be to fire a bindable inside baz and have foo wait for that bindable to be fired. Altho I think that’s technically still busy waiting.

3 Likes
#4

Thats exactly what I avoided, using any sort of loop because that will halt the thread that called it until a result is ready to be returned. The OP wanted to break the foo() function whenever baz() was called. BindableEvents would’ve been way faster in your case if the OP is okay with a halting thread. However in my case, it does the job as well but has to be used differently compared to yours.

#5

Ah ok. Yea it really just depends on what’s happening in foo because your version of foo can’t execute any other code after calling baz. Some more details from @bootsareme would be helpful.

2 Likes
#6

Judging by the way the OP worded his/her request, they want to terminate the foo() function when baz() is called, which is exactly what my function does.

1 Like
#7

If I added this:

baz.Event:Connect(function()
    --how would I end foo's thread
end)
#8 
local endFunction = Instance.new("BindableEvent")

local function foo()
	endFunction.Event:Connect(function()
		coroutine.yield()
	end)
	-- lalalala some code here, come code there
	endFunction:Fire() -- :o lets stop this function from running
end
#9

So when endFunction event is fired, foo()'s thread will die?

#10

It will yield and stop the thread until its manually continued, yes.

#11

How can I “manually continue” foos thread again? Recalling the function foo()?

#12

By using coroutine.resume().

#13

But this thread does not effect the rest of the script right, like it won’t pause the other functions, only foo?

#14

coroutine.yield() stops the current thread, so if you want other functions or code below this to run, I recommend using spawn(foo) instead of foo().