A bit more consistent

day7/main.exs

@@ -8,8 +8,10 @@ defmodule Day7 do
       |> Enum.map(fn [head | tail] -> {head, tail} end)
 
     [
-      [&*/2, &+/2], # part 1's operatons: * and +
+      # part 1's operatons: * and +
-      [&*/2, &+/2, &("#{&1}#{&2}" |> String.to_integer())] # part 2's operatons: *, +, and concat
+      [&*/2, &+/2],
+      # part 2's operatons: *, +, and concat
+      [&*/2, &+/2, &("#{&1}#{&2}" |> String.to_integer())]
     ]
     |> Enum.map(fn ops ->
       # filter valid lines for parts 1 and 2, grab their targets, and sum them
@@ -25,7 +27,7 @@ defmodule Day7 do
 
   # apply each operation to the first two operands, prepend and recurse
   defp valid?({total, [a, b | rest]}, ops) do
-    Enum.any?(ops, &valid?({total, [&1.(a, b) | rest]}, ops))
+    Enum.any?(ops, fn op -> valid?({total, [op.(a, b) | rest]}, ops) end)
   end
 end