Learn Functional Programming with Elixir

Answers for Chapter 4, Diving into Recursion

• Here’s the code of how you can find the smallest and biggest numbers in a list:

  recursion/answers/exercise_1.ex

  defmodule MyList do
    def max([]), do: nil
    def max([a]), do: a
    def max([a, b | rest]) when a >= b, do: find_max(rest, a)
    def max([a, b | rest]) when a < b, do: find_max(rest, b)
  
    defp find_max([], max), do: max
    defp find_max([head | rest], max) when head >= max, do: find_max(rest, head)
    defp find_max([head | rest], max) when head < max, do: find_max(rest, max)
  
    def min([]), do: nil
    def min([a]), do: a
    def min([a, b | rest]) when a <= b, do: find_min(rest, a)
    def min([a, b | rest]) when a > b, do: find_min(rest, ...