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| defmodule Day1P2 do | |
| @number_words %{ | |
| "zero" => 0, | |
| "one" => 1, | |
| "two" => 2, | |
| "three" => 3, | |
| "four" => 4, | |
| "five" => 5, | |
| "six" => 6, | |
| "seven" => 7, | |
| "eight" => 8, | |
| "nine" => 9 | |
| } | |
| # Replaces words representing numbers with the number itself | |
| def numberify(line) do | |
| String.replace(line, Map.keys(@number_words), fn word -> to_string(@number_words[word]) end) | |
| end | |
| def integers(codepoints) do | |
| codepoints | |
| |> Enum.flat_map(fn cp -> | |
| case Integer.parse(cp) do | |
| {i, _} -> [i] | |
| :error -> [] | |
| end | |
| end) | |
| end | |
| def pairs(integers) do | |
| [List.first(integers), List.last(integers)] | |
| end | |
| end | |
| {:ok, file} = File.open("data/day1p1.txt") | |
| file | |
| |> IO.stream(:line) | |
| |> Stream.map(&String.trim(&1)) | |
| |> Stream.map(&Day1P2.numberify(&1)) | |
| |> Stream.map(&String.codepoints(&1)) | |
| |> Stream.map(&Day1P2.integers/1) | |
| |> Stream.map(&Day1P2.pairs/1) | |
| |> Stream.map(fn [a, b] -> a * 10 + b end) | |
| |> Enum.sum() | |
| |> IO.puts |
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