Advent of Code

Section

defmodule Day1 do
  def part_one(lines) when is_list(lines) do
    lines
    |> Enum.reduce(0, fn line, sum ->
      ~r/\d/
      |> Regex.scan(line)
      |> then(fn matches ->
        List.first(List.first(matches)) <> List.first(List.last(matches))
      end)
      |> String.to_integer()
      |> Kernel.+(sum)
    end)
  end
end

"D:\\Development\\Advent of Code\\Inputs\\day1-1.txt"
|> File.read!()
|> String.split("\n", trim: true)
|> Day1.part_one()