Challenge 268 Task 2 guest solution in Elixir by Packy Anderson

2 files changed, 46 insertions, 2 deletions

diff --git a/challenge-268/packy-anderson/elixir/ch-1.exs b/challenge-268/packy-anderson/elixir/ch-1.exs
index a1f791bcab..86099dac11 100755
--- a/challenge-268/packy-anderson/elixir/ch-1.exs
+++ b/challenge-268/packy-anderson/elixir/ch-1.exs
@@ -28,8 +28,12 @@ defmodule PWC do
         IO.puts("Output: #{to_string(magic)}")
         IO.puts("\nThe magic number is #{to_string(magic)}.")
         IO.puts("@x = (" <> Enum.join(x, ", ") <> ")")
-        IO.puts("   +  " <> Enum.join(Enum.map(x, fn _ -> magic end), "  "))
-        IO.puts("@y = (" <> Enum.join(Enum.map(x, fn n -> n + magic end), ", ") <> ")")
+        IO.puts("   +  " <> Enum.join(
+          Enum.map(x, fn _ -> magic end), "  "
+        ))
+        IO.puts("@y = (" <> Enum.join(
+          Enum.map(x, fn n -> n + magic end), ", "
+        ) <> ")")
       {:err, _} ->
         IO.puts('Output: no magic number')
     end
diff --git a/challenge-268/packy-anderson/elixir/ch-2.exs b/challenge-268/packy-anderson/elixir/ch-2.exs
new file mode 100755
index 0000000000..e0f0fae4d0
--- /dev/null
+++ b/challenge-268/packy-anderson/elixir/ch-2.exs
@@ -0,0 +1,40 @@
+#!/usr/bin/env elixir
+
+defmodule PWC do
+  # list is empty, return results
+  defp numberGame([], results) do
+    results
+  end
+
+  # grab the first elem off list, recurse
+  defp numberGame([x | rest], results) do
+    numberGame(x, rest, results)
+  end
+
+  # grab second elem off list, swap them, recurse
+  defp numberGame(x, [y | rest], results) do
+    results = Enum.concat(results, [y, x])
+    numberGame(rest, results)
+  end
+
+  # sort the list and then recursively swap element pairs
+  def numberGame(ints) do
+    sortedInts = Enum.sort(ints)
+    numberGame(sortedInts, [])
+  end
+
+  def solution(ints) do
+    IO.puts("Input: @ints = (" <> Enum.join(ints, ", ") <> ")")
+    result = PWC.numberGame(ints)
+    IO.puts("Output: (" <> Enum.join(result, ", ") <> ")")
+  end
+end
+
+IO.puts("Example 1:")
+PWC.solution([2, 5, 3, 4])
+
+IO.puts("\nExample 2:")
+PWC.solution([9, 4, 1, 3, 6, 4, 6, 1])
+
+IO.puts("\nExample 3:")
+PWC.solution([1, 2, 2, 3])