2022 day 02 in Elixir

Author: sanderploegsma

2022/elixir/lib/day02.ex

@@ -0,0 +1,21 @@
+defmodule Day02 do
+  @input File.read!("../input/day02.txt")
+  @scores_part_one Enum.with_index([nil, :BX, :CY, :AZ, :AX, :BY, :CZ, :CX, :AY, :BZ])
+  @scores_part_two Enum.with_index([nil, :BX, :CX, :AX, :AY, :BY, :CY, :CZ, :AZ, :BZ])
+
+  def part_one(input \\ @input), do: calculate_score(input, @scores_part_one)
+
+  def part_two(input \\ @input), do: calculate_score(input, @scores_part_two)
+
+  defp calculate_score(input, scores) do
+    parse_input(input)
+    |> Enum.map(&Keyword.get(scores, String.to_atom(&1)))
+    |> Enum.sum()
+  end
+
+  defp parse_input(input) do
+    input
+    |> String.split("\n", trim: true)
+    |> Enum.map(&String.replace(&1, " ", ""))
+  end
+end

2022/elixir/test/day02_test.exs

@@ -0,0 +1,12 @@
+defmodule Day02Test do
+  use ExUnit.Case
+
+  @example_input """
+  A Y
+  B X
+  C Z
+  """
+
+  test "part one", do: assert(Day02.part_one(@example_input) == 15)
+  test "part two", do: assert(Day02.part_two(@example_input) == 12)
+end