One more DRY-up

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