day1

Mix.install([
  {:kino, "~> 0.11.3"}
])

Section

test_input = Kino.Input.textarea("Input")

qs_example = String.split("two1nine
eightwothree
abcone2threexyz
xtwone3four
4nineeightseven2
zoneight234
7pqrstsixteen")

qs = String.split(Kino.Input.read(test_input), "\n")

defmodule MyCode do
  def match_first_num(s) do
    case s do
      "one" <> _ -> 1
      "two" <> _ -> 2
      "three" <> _ -> 3
      "four" <> _ -> 4
      "five" <> _ -> 5
      "six" <> _ -> 6
      "seven" <> _ -> 7
      "eight" <> _ -> 8
      "nine" <> _ -> 9
      "1" <> _ -> 1
      "2" <> _ -> 2
      "3" <> _ -> 3
      "4" <> _ -> 4
      "5" <> _ -> 5
      "6" <> _ -> 6
      "7" <> _ -> 7
      "8" <> _ -> 8
      "9" <> _ -> 9
      _ -> MyCode.match_first_num(String.slice(s, 1, String.length(s) - 1))
    end
  end

  def match_last_num(s) do
    case s do
      "eno" <> _ -> 1
      "owt" <> _ -> 2
      "eerht" <> _ -> 3
      "ruof" <> _ -> 4
      "evif" <> _ -> 5
      "xis" <> _ -> 6
      "neves" <> _ -> 7
      "thgie" <> _ -> 8
      "enin" <> _ -> 9
      "1" <> _ -> 1
      "2" <> _ -> 2
      "3" <> _ -> 3
      "4" <> _ -> 4
      "5" <> _ -> 5
      "6" <> _ -> 6
      "7" <> _ -> 7
      "8" <> _ -> 8
      "9" <> _ -> 9
      _ -> MyCode.match_last_num(String.slice(s, 1, String.length(s) - 1))
    end
  end

  def func(s) do
    n1 = MyCode.match_first_num(s)
    n2 = MyCode.match_last_num(String.reverse(s))
    n1 * 10 + n2
  end
end

Enum.reduce(
  Enum.map(qs, &amp;MyCode.func(&amp;1)),
  0,
  fn a, b -> a + b end
)