Here’s mine:

advent_of_code/day_01.ex at master · code-shoily/advent_of_code (github.com)

Observations:

• Though wasn’t applicable, but had a re-read of chunk_by and chunk_while-s document. Everytime something needs chunking, I reach out for chunk_by and end up using chunk or chunk_every
• I had forgotten to use chunk_every’s :discard
• Livebook + Advent of Code = Elixir is the best way to solve AoC.

My solution using chunk_every/4

Part 1

#!/usr/bin/env elixir

File.stream!("input.txt")
|> Stream.map(&String.trim/1)
|> Stream.map(&String.to_integer/1)
|> Stream.chunk_every(2, 1, :discard)
|> Enum.count(fn [a, b] -> a < b end)
|> IO.inspect()

Part 2

#!/usr/bin/env elixir

File.stream!("input.txt")
|> Stream.map(&String.trim/1)
|> Stream.map(&String.to_integer/1)
|> Stream.chunk_every(3, 1, :discard)
|> Stream.map(&Enum.sum/1)
|> Stream.chunk_every(2, 1, :discard)
|> Enum.count(fn [a, b] -> a < b end)
|> IO.inspect()

My solutions for day 1 can be found here: https://github.com/josevalim/aoc/blob/main/2021/day-01.livemd

I used Livebook and I solved using different styles: enum, nx, and recursion. You can find the streaming here: Twitch