How would I save a previous number if it changed?

Help and Feedback Scripting Support
#1

So what I’m trying to do is save a number, then if the number gets changed, it saves the previous number to another variable. I’ve been trying to figure out how to do this but can’t figure it out.

#2 
local currentValue = nil
local previousValue = nil

local SetValue = function(value)
	previousValue = currentValue
	currentValue = value
end

SetValue(5)
SetValue(25)

print("previous:", previousValue)
print("current:", currentValue)
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