Explain each line of haskell code -- function to help double every other element of list doubleDigitsHelper :: [Integer] -> Integer -> [Integer] doubleDigitsHelper l t | l == [] = [] -- in line 5 l is assigned to an empty list | t == 0 = [head l] ++ (doubleDigitsHelper (drop 1 l) 1) | t == 1 = [2*(head l)] ++ (doubleDigitsHelper (drop 1 l) 0)   -- function to double every other element doubleDigits :: [Integer] -> [Integer] doubleDigits l = reverse (doubleDigitsHelper (reverse l) 0)

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