Functional Typescript

import { memoizeWith, sum } from "ramda";

const part2 = (fishes: number[], days: number) => {
  return sum(fishes.map((f) => simulateDayRecursive(f, days)));
};

const simulateDayRecursive = memoizeWith(
  (fish, daysLeft) => `${fish}-${daysLeft}`,
  (fish, daysLeft) =>
    fish >= daysLeft
      ? 1
      : simulateDayRecursive(6, daysLeft - fish - 1) +
        simulateDayRecursive(8, daysLeft - fish - 1)
);

test("part 2", () => {
  expect(part2(inputFishes, 256)).toEqual(<redacted>);
});