Parse multiple lines

data = "Sacramento;16.2\nMakurdi;27.9\nTromsø;3.2"

defmodule Z do
  def parse_rows(input) do
    parse_rows(input, [])
  end

  def parse_rows("", acc), do: acc

  def parse_rows(input, acc) do
    {city, temp, rest} = parse_row(input)
    parse_rows(rest, [{city, temp} | acc])
  end

  def parse_row(line) do
    parse_row(line, line, 0)
  end

  def parse_row(line, <_rest::binary>, count) do
    <> = line
    {temp, remaining} = parse_temperature(temp_value)
    {city, temp, remaining}
  end

  def parse_row(line, <<_current_char, rest::binary>>, count) do
    parse_row(line, rest, count + 1)
  end

  def parse_temperature(<d1,?.,d2,?\n,rest::binary>) do
    {-(char_to_num(d1) * 10 + char_to_num(d2)), rest}
  end

  def parse_temperature(<d1,?.,d2,rest::binary>) do
    {-(char_to_num(d1) * 10 + char_to_num(d2)), rest}
  end

  def parse_temperature(<>) do
    {char_to_num(d1) * 10 + char_to_num(d2), rest}
  end

  def parse_temperature(<>) do
    {char_to_num(d1) * 10 + char_to_num(d2), rest}
  end

  def parse_temperature(<d1,d2,?.,d3,?\n,rest::binary>) do
    {-(char_to_num(d1) * 100 + char_to_num(d2) * 10 + char_to_num(d3)), rest}
  end

  def parse_temperature(<d1,d2,?.,d3,rest::binary>) do
    {-(char_to_num(d1) * 100 + char_to_num(d2) * 10 + char_to_num(d3)), rest}
  end

  def parse_temperature(<>) do
    {char_to_num(d1) * 100 + char_to_num(d2) * 10 + char_to_num(d3), rest}
  end

  def parse_temperature(<>) do
    {char_to_num(d1) * 100 + char_to_num(d2) * 10 + char_to_num(d3), rest}
  end

  defp char_to_num(char), do: char - ?0
end

result = Z.parse_rows(data)

ets table types

ets_table = :ets.new(:station_stats, [:duplicate_bag, :public])

:ets.insert(ets_table, {"", %{x: 1}})

:ets.insert(ets_table, {"", %{x: 1}})
:ets.tab2list(ets_table)

[1, 2, 3, ""] |> Enum.filter(fn x -> x == "" end)