WaitForChild recursive

Feature Requests Studio Features
#1

Combine the recursive functionality of FindFirstChild with WaitForChild and you have something useful and wonderful.

2 Likes
#2

WaitForC is pretty much a FFC check, then a connection to ChildAdded, it would be simple to make your own, that connected to DescendantAdded instead

#3

local function waitForChild(parent, childName, isRecursive) local eventSignal local function fetch(child) if childName == child.Name then eventSignal:disconnect() return child end end if isRecursive then eventSignal = parent.DescendantAdded:connect(fetch) else eventSignal = parent.ChildAdded:connect(fetch) end end

something something didn’t test it

#4

[quote] local function waitForChild(parent, childName, isRecursive) local eventSignal local function fetch(child) if childName == child.Name then eventSignal:disconnect() return child end end if isRecursive then eventSignal = parent.DescendantAdded:connect(fetch) else eventSignal = parent.ChildAdded:connect(fetch) end end

something something didn’t test it [/quote]

What about just this?:

2IfDSXd.png763×94 5 KB

#5

What about not having the function call an expensive engine-side method every frame?

#6 
local function waitForDescendant(instance, name)
	local descendant = instance:FindFirstChild(name, true)
	if not descendant then
		repeat
			descendant = instance.DescendantAdded:wait()
		until descendant.Name == name
	end
	return descendant
end
2 Likes
Yield until expected instances (Descending from StarterGui) load
#7

What about not having the function call an expensive engine-side method every frame?[/quote]

I’m sorry, ‘expensive engine-side method’? Yielding a coroutine and resuming it isn’t that expensive from what I remember.

#8

That’s the “every frame” part, not the “expensive method” part. Hint: wait isn’t a method

#9

Calling engine-side methods like FindFirstChild from Lua is expensive. That code calls that method every frame, more than 30 times per second! Osyris’ code uses events, which is much better.

#10

Osyris’ code doesn’t return anything. The return statement is inside of a listener, not in the function’s body.

#11

This should be built into ROBLOX.

9 Likes
#12

#13

Since this thread was bumped…

Yeah, I wrote that very quickly without testing it. :disappointed:

This version should work fine:

local function waitForChild(parent, childName, isRecursive) local child = parent:FindFirstChild(childName, isRecursive) while true do if child and child.Name == childName then return child end if isRecursive then child = parent.DescendantAdded:wait() else child = parent.ChildAdded:wait() end end end