AdventOfCode-js-2019/12/12_2.js

const Moon = require("./Moon");
const { step, parseInput } = require("./common");

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>",
// ]);

const tests = parseInput([
    "<x=-8, y=-10, z=0>",
    "<x=5, y=5, z=10>",
    "<x=2, y=-7, z=3>",
    "<x=9, y=-8, z=-3>",
]);

const moons = input;

/**
 * The amount of steps it takes for a moon to reach its initial state
 *
 * Each index in this array corresponds to the index moon in the input.
 */
const stepsToLoop = [0, 0, 0, 0];
let loopsFound = 0;

do {
    step(moons);

    if ((loopsFound & 1) == 0) {
        if (moons[0].hasReachedInitialState()) { loopsFound += 1; }
        stepsToLoop[0]++;
    }

    if ((loopsFound & 2) == 0) {
        if (moons[1].hasReachedInitialState()) { loopsFound += 2; }
        stepsToLoop[1]++;
    }

    if ((loopsFound & 4) == 0) {
        if (moons[2].hasReachedInitialState()) { loopsFound += 4; }
        stepsToLoop[2]++;
    }

    if ((loopsFound & 8) == 0) {
        if (moons[3].hasReachedInitialState()) { loopsFound += 8; }
        stepsToLoop[3]++;
    }
} while (loopsFound != 15);

console.log(stepsToLoop);

// console.log(`Steps required to loop: ${steps}`);