From 20b941641ce53c51881257de4abb4a67cd4f72fa Mon Sep 17 00:00:00 2001
From: Dustin Swan <dustin@dustinswan.com>
Date: Thu, 5 Dec 2024 16:58:17 -0700
Subject: [PATCH] One more DRY-up

---
 day5/main.exs | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/day5/main.exs b/day5/main.exs
index 0ee8ea1..46f4a70 100644
--- a/day5/main.exs
+++ b/day5/main.exs
@@ -4,7 +4,7 @@ defmodule Day5 do
 
     {invalidUpdates, validUpdates} = Enum.split_with(updates, &updateInvalid?(&1, rules))
 
-    IO.puts("Part 1: #{Enum.sum(Enum.map(validUpdates, &middleDigit/1))}")
+    IO.puts("Part 2: #{sumMiddles(validUpdates)}")
 
     # sort the invalid ones with a sorter that looks for [a, b] in the rules list. if [a, b] exists, sort a before b
     invalidSorted =
@@ -12,7 +12,7 @@ defmodule Day5 do
         Enum.sort(update, &Enum.member?(rules, [&1, &2]))
       end)
 
-    IO.puts("Part 2: #{Enum.sum(Enum.map(invalidSorted, &middleDigit/1))}")
+    IO.puts("Part 2: #{sumMiddles(invalidSorted)}")
   end
 
   defp parseFile(file) do
@@ -31,9 +31,12 @@ defmodule Day5 do
     end)
   end
 
-  defp middleDigit(l) do
-    middle = trunc(length(l) / 2)
-    String.to_integer(Enum.at(l, middle))
+  defp sumMiddles(updates) do
+    Enum.map(updates, fn update ->
+      middle = trunc(length(update) / 2)
+      String.to_integer(Enum.at(update, middle))
+    end)
+    |> Enum.sum()
   end
 end