adventofcode/2022/11/part2.js

import * as R from "remeda";

const playTurn = (max, monkeys, monkey) => {
  monkey.inspections += monkey.items.length;

  monkey.items
    .map((i) => monkey.operation(i) % max)
    .forEach((i) => {
      monkeys[i % monkey.divisible ? monkey.ifFalse : monkey.ifTrue].items.push(
        i
      );
    });

  monkey.items = [];

  return monkey;
};

const genPlayRound = (monkeys) => {
  const max = monkeys.map(R.prop("divisible")).reduce((a, b) => a * b);

  return () => monkeys.map((monkey) => playTurn(max, monkeys, monkey));
};

export default R.createPipe(
  R.clone,
  (monkeys) => R.times(10000, genPlayRound(monkeys)),
  R.last(),
  R.map(R.prop("inspections")),
  R.sortBy(R.identity),
  R.reverse,
  R.take(2),
  R.reduce((a, b) => a * b, 1)
);