adventofcode/2022/13/part2.js

import * as R from "remeda";
import { isLessThan } from "./part1";

const dividers = [[[2]], [[6]]];
export default R.createPipe(
  R.flatten,
  R.concat(dividers),
  (packets) => packets.sort(isLessThan),
  (packets) =>
    packets.map((p, i) => ({ i: i + 1, divider: dividers.includes(p) })),
  R.filter(({ divider }) => divider),
  R.map(R.prop("i")),
  (v) => v.reduce((a, b) => a * b)
);