Solution for "Advent of Code" Day 3 Part 1

Day3-1.js

let fs = require("fs")

const readFileLines = filename =>
    fs.readFileSync(filename)
        .toString('utf-8')
        .split('\n');

let inputArray = readFileLines('C:\\AdventOfCode\\day3.txt');

function countResult(inputArray, gamma_epsilon) {
    const arrays = [[], [], [], [], [], [], [], [], [], [], [], []];
    let result = '';
    let current = [];
    for (let i = 0; i < inputArray.length; i++) {
        current = inputArray[i].split('');
        for (let j = 0; j < current.length; j++) {
            arrays[j].push(current[j]);
        }
    }
    const decision = (arr, decide) => {
        let zeros = 0;
        let ones = 0;
        arr.forEach(digit => {
            if (Number(digit) === 0) zeros += 1;
            else ones += 1;
        });
        if (decide === "gamma") {
            if (zeros > ones) return "0"
            else return "1"
        } else {
            if (zeros > ones) return "1"
            else return "0"
        }
    }
    for (let element of arrays) {
        result += (decision(element, gamma_epsilon));
    }
    return parseInt(result, 2);
}
const powerConsumption = countResult(inputArray, "gamma") * countResult(inputArray, "epsilon");
console.log(powerConsumption);