help with indexing all values at once instead of progressively?

I want to index values all at once so I don't have to constantly add if statements like so:

while true do
	wait(1)
	--all values here--
	local part
	local light
part = script.Parent:FindFirstChild("Part2")
if part then
light = part:FindFirstChild("SurfaceLight")
end
--------------------------




--index values here--
if part and light then
	print("ran")
end
end
----------------------

when there a re a lot of children to index theres going to be a lot of if statements which is not desired as I want everything to be setup at once regardless of how many children there are.

something like this:

while true do
	wait(1)
	--all values here--
local part = script.Parent:FindFirstChild("Part2")
local light = part:FindFirstChild("SurfaceLight")
--------------------------




--index values here--
if part and light then
	print("ran")
end
end
----------------------

unfortunately if "part" becomes nil, an error comes up saying "attempting to index nil with findfirstchild"

is there a way around this to accomplish what I am trying to do?

You can store all respective children into an array via using the :GetChildren() method on the Instance you desire to gather all children from. Then use a pairs loop to iterate through each Instance and perform the given task on each Object.

for _,Light in pairs(script.Parent.Part2:GetChildren()) then
	if (Light:IsA("SurfaceLight")) then
		print("ran")
	end
end)