AdventOfCode-js-2019/12/12_1.js

const util = require("util");
const Vector3 = require("./Vector3");
const Moon = require("./Moon");

const input = parseInput([
    "<x=14, y=15, z=-2>",
    "<x=17, y=-3, z=4>",
    "<x=6, y=12, z=-13>",
    "<x=-2, y=10, z=-8>",
]);

const tests = parseInput([
    "<x=-1, y=0, z=2>",
    "<x=2, y=-10, z=-7>",
    "<x=4, y=-8, z=8>",
    "<x=3, y=5, z=-1>",
]);

/**
 * Find the gravitational influence two moons have on each other
 *
 * @param {Moon} moonA The first moon to consider
 * @param {Moon} moonB The second moon to consider
 *
 * @returns {Vector3} The gravitational influence of Moon B on Moon A
 */
function calculateGravity(moonA, moonB) {
    // The gravitational pull on Moon A caused by Moon B
    const gravityDifference = new Vector3(
        // eslint-disable-next-line no-nested-ternary
        moonB.position.x > moonA.position.x ? 1 : (moonB.position.x < moonA.position.x ? -1 : 0),
        // eslint-disable-next-line no-nested-ternary
        moonB.position.y > moonA.position.y ? 1 : (moonB.position.y < moonA.position.y ? -1 : 0),
        // eslint-disable-next-line no-nested-ternary
        moonB.position.z > moonA.position.z ? 1 : (moonB.position.z < moonA.position.z ? -1 : 0),
    );

    return gravityDifference;
}

/**
 * @param {string[]} inputs The day's input
 * @returns {Moon[]} An array of Moon objects
 */
function parseInput(inputs) {
    const moons = [];
    const parseRegex = new RegExp(/x=(-?\d+), y=(-?\d+), z=(-?\d+)/);

    for (const position of inputs) {
        // eslint-disable-next-line no-shadow-restricted-names
        const [undefined, x, y, z] = position.match(parseRegex);
        moons.push(new Moon(new Vector3(parseInt(x, 10), parseInt(y, 10), parseInt(z, 10))));
    }

    return moons;
}

// console.log(util.inspect(parseInput(input)));