Advent of Code Fishies

advent_of_code_06.js

const fs = require('fs');
const path = require('path');

const problemPart = 1;
const fileName = `input-${problemPart}.txt`;
const input = fs.readFileSync(path.resolve(__dirname, fileName), 'utf8')
const inputArray = input.split(',').map(x => Number(x));

function timeTravel(fishies, timeTravelDays) {
    let fishBirthDayCounts = {
        0: fishies.filter(x => x === 0).length,
        1: fishies.filter(x => x === 1).length,
        2: fishies.filter(x => x === 2).length,
        3: fishies.filter(x => x === 3).length,
        4: fishies.filter(x => x === 4).length,
        5: fishies.filter(x => x === 5).length,
        6: fishies.filter(x => x === 6).length,
        7: fishies.filter(x => x === 7).length,
        8: fishies.filter(x => x === 8).length,
    }

    for (let currentDay = 0; currentDay < timeTravelDays; currentDay++) {
        fishBirthDayCounts = {
            0: fishBirthDayCounts['1'],
            1: fishBirthDayCounts['2'],
            2: fishBirthDayCounts['3'],
            3: fishBirthDayCounts['4'],
            4: fishBirthDayCounts['5'],
            5: fishBirthDayCounts['6'],
            6: fishBirthDayCounts['7'] + fishBirthDayCounts['0'],
            7: fishBirthDayCounts['8'],
            8: fishBirthDayCounts['0'],
        }
    }

    let total = 0;
    Object.keys(fishBirthDayCounts).forEach(x => {
        total += fishBirthDayCounts[x]
    });

    console.log(fishBirthDayCounts)
    console.log(total)
}

console.log('~~ 80')
timeTravel(inputArray, 80)
console.log('~~ 256')
timeTravel(inputArray, 256)