I was just analizing the Luhn algorithm and... the step to reverse the digits doesn't seem to do anything, right? None of the other steps depend on it and in th

I was just analizing the Luhn algorithm and... the step to reverse the digits doesn't seem to do anything, right? None of the other steps depend on it and in the end you just sum all of the digits together... Is it because the amount of initial digits might not have the same parity and therefore you'd sum a different set of digits depending on whether you reverse or not?