AdventOfCode2021/Day2/Submarine.ts

import { readLines } from "https://deno.land/std@0.177.1/io/read_lines.ts";

async function Part1() {
    const file = await Deno.open("./Day2/input.txt");

    let depth = 0;
    let position = 0;

    for await (const line of readLines(file)) {
        const commands = line.split(" ");
        switch(commands[0]) {
            case "forward": {
                position += +commands[1];
                break;
            }
            case "down": {
                depth += +commands[1];
                break;
            }
            case "up": {
                depth -= +commands[1];
                break;
            }
        }
    }

    return position * depth;
}

async function Part2() {
    const file = await Deno.open("./Day2/input.txt");

    let depth = 0;
    let position = 0;
    let aim = 0;

    for await (const line of readLines(file)) {
        const commands = line.split(" ");
        switch(commands[0]) {
            case "forward": {
                position += +commands[1];
                depth += aim * +commands[1];
                break;
            }
            case "down": {
                aim += +commands[1];
                break;
            }
            case "up": {
                aim -= +commands[1];
                break;
            }
        }
    }

    return position * depth;
}

console.log("Part1: " + await Part1());

console.log("Part1: " + await Part2());