Uncommented Day 1 code, writeup to come!

day1.exs

@@ -0,0 +1,29 @@
+defmodule DayOne do
+  def partOne(input) do
+    String.split(input, "\n")
+          |> Enum.map(&DayOne.parseNum/1)
+          |> List.foldr(0, &(&1 + &2))
+  end
+
+  def partTwo(input), do: partTwo(String.split(input, "\n") |> Enum.map(&DayOne.parseNum/1), 0, [])
+
+  def partTwo(input, acc , frequencies) do
+    [head | tail] = input
+    freq = head + acc
+    # IO.puts("Got frequency #{freq}")
+    if Enum.member?(frequencies, freq), do: freq, else: partTwo(tail ++ [head], freq, [freq | frequencies])
+  end
+
+  def parseNum("+" <> num) do 
+    {intVal, ""} = Integer.parse(num)
+    intVal
+  end
+  def parseNum("-" <> num) do
+    {intVal, ""} = Integer.parse(num)
+    0 - intVal
+  end
+  def parseNum(num) do
+    IO.puts(num)
+    0
+  end
+end