AdventOfCode/2020/day5/day5part1-bitstring.exs

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Elixir
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defmodule Day5Part1 do
def run do
File.stream!("input")
|> Stream.map(&String.trim/1)
|> Stream.map(&seat_id/1)
|> Enum.max()
|> IO.puts()
end
def char_to_bit(c) when c in 'FL', do: <<0::1>>
def char_to_bit(c) when c in 'BR', do: <<1::1>>
def seat_id(boarding_pass) do
<<id::10>> = for <<char <- boarding_pass>>, into: <<>>, do: char_to_bit(char)
id
end
end
Day5Part1.run()