pass test for it parses a game set to produce a map of red, green and…

… blue amounts

lib/day2/day2.ex

@@ -15,4 +15,41 @@ defmodule Day2 do
     |> String.split(";")
     |> Enum.map(&String.trim/1)
   end
+
+  def parse_game_set_amounts(set_string) do
+    initial_cube_map = %{
+      :red => 0,
+      :green => 0,
+      :blue => 0
+    }
+
+    cube_list = String.split(set_string, ",")
+
+    Enum.reduce(cube_list, initial_cube_map, fn x, acc ->
+      case String.contains?(x, "red") do
+        true -> Map.put(acc, :red, extract_integer(x))
+        false -> acc
+      end
+      |> (fn acc ->
+            case String.contains?(x, "green") do
+              true -> Map.put(acc, :green, extract_integer(x))
+              false -> acc
+            end
+          end).()
+      |> (fn acc ->
+            case String.contains?(x, "blue") do
+              true -> Map.put(acc, :blue, extract_integer(x))
+              false -> acc
+            end
+          end).()
+    end)
+  end
+
+  def remove_non_digits(str) do
+    Regex.replace(~r/\D/, str, "")
+  end
+
+  def extract_integer(string) do
+    remove_non_digits(string) |> String.to_integer()
+  end
 end

test/day1/day1_test.exs

@@ -38,16 +38,16 @@ defmodule Day1Test do
              1,
              fn x -> Day1.convert_word_to_integer_string(x) end
            ) == [
-             "0",
-             "1",
-             "2",
-             "3",
-             "4",
-             "5",
-             "6",
-             "7",
-             "8",
-             "9"
+             "zero0zero",
+             "one1one",
+             "two2two",
+             "three3three",
+             "four4four",
+             "five5five",
+             "six6six",
+             "seven7seven",
+             "eight8eight",
+             "nine9nine"
            ]
   end
 
@@ -59,7 +59,7 @@ defmodule Day1Test do
     assert Day1.convert_substrings_to_integer_strings(
              "zero one two three four five six seven eight nine"
            ) ==
-             "0 1 2 3 4 5 6 7 8 9"
+             "zero0zero one1one two2two three3three four4four five5five six6six seven7seven eight8eight nine9nine"
   end
 
   test "should convert substrings according to a replacement map" do

test/day2/day2_test.exs

@@ -29,12 +29,16 @@ defmodule Day2Test do
   end
 
   test "it parses a game set to produce a map of red, green and blue amounts" do
-    set_string = "7 red, 14 blue 8 green"
+    set_string = "7 red, 14 blue, 8 green"
 
-    assert Day2.get_game_set_amounts(set_string) = %{
+    assert Day2.parse_game_set_amounts(set_string) == %{
              :red => 7,
              :green => 8,
              :blue => 14
            }
   end
+
+  test "it extracts integer from a string" do
+    assert Day2.extract_integer("21 meow 21") == 2121
+  end
 end