Learn Functional Programming with Elixir

Answers for Chapter 3, Using Pattern Matching to Control the Program Flow

• Here’s the function that calculates the total points spent in attributes:

  pattern_matching/answers/exercise_1.ex

  defmodule CharacterAttributes do
    def total_spent(%{strength: str, dexterity: dex, intelligence: int}) do
      (str * 2) + (dex * 3) + (int * 3)
    end
  end

• The Tic-Tac-Toe module should be like this:

  pattern_matching/answers/exercise_2.ex

  defmodule TicTacToe do
    def winner({
      x, x, x,
      _, _, _,
      _, _, _
    }), do: {:winner, x}
  
    def winner({
      _, _, _,
      x, x, x,
      _, _, _
    }), do: {:winner, x}
  
    def winner({
      _, _, _,
      _, _, _,
      x, x, x
    }), do: {:winner, x}
  
    def winner({
      x, _, _,
      x, _, _,
   x, _, _ ...