How can I get all the descendants, without using GetDescendants()

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#1

The title says it all, but i’ll elaborate.
I’ve been having trouble using GetDescendants because its goofy and doesn’t get all the descendants, so is there a way to individually get each child of each child of each child and so on, or another option?

#3 
local function doSomethingToDescendants(parent: Instance, _function: (instance: Instance) -> nil)
	for i, v in ipairs(parent:GetChildren()) do
		doSomethingToDescendants(v, _function)

		_function(v)
	end
end