adventofcode/2021/02/part2.mjs
2021-12-05 11:44:39 -05:00

19 lines
479 B
JavaScript

import fp from "lodash/fp.js";
import u from "updeep";
const update = (action, value) =>
action === "down" ? u({ aim: fp.add(value) })
: action === "up" ? u({ aim: fp.add(-value) })
: u((state) =>
u({ x: fp.add(value), depth: fp.add(value * state.aim) }, state)
);
export function solution(lines) {
const { x, depth } = lines.reduce(
(accum, line) => update(...line)(accum),
{ depth: 0, aim: 0, x: 0 }
);
return x * depth;
}