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

const util = require("util");

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

class Vector3 {
    /**
     * A 3D vector
     *
     * @param {number} x The X value of this vector
     * @param {number} y The Y value of this vector
     * @param {number} z The Z value of this vector
     */
    constructor(x, y, z) {
        this.x = x;
        this.y = y;
        this.z = z;
    }

    /**
     * Add another vector to this one
     *
     * @param {Vector3} operand The vector to add to this one
     * @returns {void}
     */
    add(operand) {
        this.x += operand.x;
        this.y += operand.y;
        this.z += operand.z;
    }
}

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

/**
 * @param {string[]} inputs The day's input
 * @returns {Vector3[]} An array of Vector3's representing the positions of moons
 */
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 Vector3(parseInt(x, 10), parseInt(y, 10), parseInt(z, 10)));
    }

    return moons;
}

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