03 Binary Diagnostic.js

/** Advent of Code 2021
 * Challenge Day 3: Binary Diagnostic
 * https://adventofcode.com/2021/day/3
 * */

const INPUT = `110001010111
011011110010
110011110011
101000010111
011101100100
111001011100
011100000101
011110110011
001001111111
111000010000
001000101100
011100111010
011100111000
011100010001
100001100000
111010111110
100011000101
010111000101
100110110011
101010110011
110101110010
110111100010
000001100100
010010011010
001001001100
101000000111
100100110011
111111100011
110010001010
100010110011
111101101001
101001001101
110111011101
100100101101
111111000011
001110010110
010110110010
010011100000
110011100011
111101001011
100001101000
100101100011
010101100110
101000001001
010001011100
111001010010
000110000110
110110111111
111111010000
110111110011
110110010010
000001001111
010001000111
101101100110
110011100100
101000010100
010100010000
100011001001
011000111101
000101011101
000110111110
011000101100
110101101001
100011110011
110101010001
100010100000
110010010001
000101101011
101100111011
111110110001
011001000100
001101111000
100100100101
101111001000
011010110110
001110011111
101011001001
110000100010
011110100110
001100101100
000110000001
011111001111
011000110010
001100011111
111100010100
010011111000
000100101010
101111100101
010000001100
100100101111
100011101100
000001111000
001110000011
011101011001
000001111101
000011001011
111111000110
000001011100
011001100000
111001011101
011010000011
101010101110
010110010101
000011101101
010010011000
000010100111
001000000111
111111011100
101010010000
101001001100
000000100111
101010101100
010110100111
001010001101
111000000101
111001101100
011110010001
011001111010
010010011011
011110111000
010111110000
001110001011
010001001011
011001001010
011001001101
001101011101
100110100000
100001111110
101110100011
100010111111
001010010011
000010011001
011001111101
000100000010
100110010011
001111001000
110001011101
000100011000
111110000000
111001101000
100111000100
010000010100
011000110111
000110001101
101100110010
011111101001
000000100010
000001101000
111001111101
111100010111
110000010101
110000101100
101111010011
000100010101
100111100011
110100101111
101000001000
001000100000
100111111010
001101111101
000000101000
100111101100
100111010100
111100010110
100001010011
010010001000
111101010101
101110101010
111110001110
001010111010
100110001000
101111001111
110010011101
110001110101
011101000000
010011110110
001110101001
011110011010
110010111100
010000100001
010010000100
111111000101
010111100111
101010110010
100010010011
101011010000
000101100000
011001000011
010110000000
101011101111
001101001110
001100100110
011111110011
010000101101
000111101101
111100101101
000011001101
110011111100
011000110000
000001010010
111100111111
001010000100
000011010010
010001000001
111010111000
110001010011
000000101011
011110011011
100110111000
010010110010
000010111110
110010001001
000111001001
001000011100
111111011010
000000110101
111011111011
100001110111
010001110000
010101100100
011010100001
111000101101
001100110110
010001111110
100000101011
011111111001
111000001100
011111100011
110110110000
011000101010
101000000011
101111110100
011000101101
001000011010
101001100111
101100001101
100100101100
001101011001
001111100111
011100101001
110010000000
010100111000
000011010111
000000100110
101001000000
000110100100
110001110011
001011001101
100000111100
101011011111
000010110110
010101110100
111100111001
111010101101
101100001001
011111000111
010001101000
100000001111
011111101100
011111100111
111101111110
110110100101
011110001011
100111100001
000001101101
100110101110
100000010011
110000000001
001001101001
000001111111
111001001010
101011100101
100100000000
110001101011
011111001011
010010001011
000101010011
110010110100
101010101011
100100001100
000001100011
101010000010
111101100100
001011010111
000001010001
001010001011
100110000011
000010101010
110111011100
001100111000
111011010111
100100110000
000010111010
000011010001
100001111111
111111000100
010111111000
100101010010
001111111010
001111011100
111101100111
111011011011
111000100110
011101001011
010100101010
010100001111
010000001111
000000000010
010011010111
001101001011
101011001011
011001101101
100000000111
100110011010
000101000110
101100010011
101011011100
001101010100
110101110111
001100001000
001001100100
111101011010
001100100100
100000100010
001110111001
101101001110
001101110111
010101100101
000011111110
001000111101
110011101011
110101011000
000000100101
100110100001
111111101101
010100101111
110101011010
011010011100
101101010001
101001010011
011111001100
101001010111
011100100011
101011110000
010111001010
111011000111
100111001101
001110111010
100001111000
111011010011
110000101010
011010000000
110001111010
100101000100
010000110100
101000101010
011010101110
010000111100
101011100100
101101111010
111011111110
000101010111
000010111000
011101101010
101110100110
010000011010
101100100000
010011010101
101100011100
011010101010
010111101010
111011100111
111111110010
101101100100
111001010100
011000001110
110110001110
111110100110
001011011100
101000010010
100000101010
010000011110
001001110111
001001001011
110010011110
001111001100
110110100010
111100000111
010101101011
001111111001
101011000000
011100011000
000001000000
100101001100
110010011001
111100111110
010000110110
110000111000
110111100001
000100100010
100010001110
010000111101
111100011000
110000000101
000000000001
010011111100
011011111101
111001111010
001001001001
010101011010
011010011111
001111000011
101111111111
000111101000
011000111110
001100101101
101000000110
000100001010
111110010101
000011101000
011010101000
100111100000
111001111111
010101000111
011000100101
001001110001
101101011011
001000001100
111110111010
011110111010
111101100001
011111101000
110100010100
010001110011
000011010011
010000110010
000011111011
101111011000
010101111110
100100101011
001000011011
011000100000
100100111101
001010110011
000000000000
000110111011
001001011001
011101010010
000111000011
010001000100
011110011111
010010111011
100000000011
001100111101
000001000110
000010000010
101111001010
000111000001
100101011100
111001110100
100111001111
011110111111
010101011110
101010011011
101000010101
101001101000
001001011101
010110101100
101110111100
000111011110
010111001101
001101100010
011101001111
100111111111
000110101110
011110001110
110011100111
010011100101
100101000011
100101010011
111000110110
110111011111
000100011110
100000000001
010111111111
100000100011
110010011111
111101110110
001000001001
001100011001
111100110001
100110100101
010111101000
000000000110
000011011001
100100001111
001111100100
001011010011
001000110011
110100010010
011100110111
011010110010
011001110110
011011100010
001110101011
101101100111
101101111100
000110000101
000001110010
001101110010
101011000100
000110000000
001001011111
100101101011
001010100001
110000111110
011111101111
110110111100
001000010110
000101111110
111001000001
000100110011
110110000101
101100101011
101110000010
011101100001
010011000001
010111000011
010111011101
101010100001
000111011011
101110010000
110000000010
101100011101
011000011000
001111101101
101000001010
101011010001
011111100001
101001011110
100101011000
011110001100
111100011110
010011101110
001001110000
001001000011
100001010000
000110010000
110111010111
000100110101
001110101000
101011000011
001011100000
111111111111
111111011110
110001100001
001000001111
101000100100
001011001001
110110001101
000100000000
011100001101
110011001000
001111011101
010000111111
010110011110
011110111011
101111011101
001100011000
001011111001
000110001011
011011010100
111110001011
010000110111
001100011101
011110111001
000010101001
001110000001
011111010101
000010010100
000101011001
100100000001
001111101011
111110010011
000111111011
001101010110
001100111001
000100011101
111010010111
000100000001
001011101111
101001110011
001011110101
011000001101
110011001011
011110111100
110110101000
011010001101
110111001000
110010010101
011010001011
000011100111
011000110001
001100001111
110010011010
101100101100
001100000110
010101001111
000011000100
110001000111
001001011000
001001001000
000010111101
100101001010
011100111100
101000011011
101011010111
111001000011
100100100110
011001011011
000011110011
001101000111
011010010100
101010101000
100010110000
100001011110
100000110110
001011101001
000110100011
111000101010
111001011001
101111010010
011100101010
100010111000
010100101110
011001110000
000010001101
101110000111
011011001111
011110001000
010010100011
110001100010
001101011011
110100000101
101110100111
001110111011
000110100101
100100100001
101000111100
100011101110
110010000101
101100011001
100000010111
011100100101
000010011011
001011001100
011001000000
000101000101
100001001100
000001101010
110111101100
111001101010
110000110111
000110010001
011100000000
010000111010
000101000000
010000101010
010011110001
101011010101
100000110111
101001110010
100011011100
010011100011
100000100111
110100110000
000100001011
101101011000
010110011001
010110111111
101110010101
011110001101
110001001000
001001101100
100111010011
001100010011
110101111001
100010101011
111010001110
110001100111
111000010010
001000001011
111001000010
100100100100
110010101001
111101101010
111111100101
100010010001
001010010110
111101011000
001010111100
001001111110
100010100110
100001110100
001111001101
101100100111
101101100101
100101110111
000111110111
000111001000
010101000010
011000111100
001001001110
111101010001
001011010101
100011000111
100000001001
011100011110
010111011011
011000010011
101101011110
000000100011
111110010010
111010011101
001000100100
110101100001
100101101000
001110111111
010001000101
111110000101
101000001101
110101010000
111110101110
011111011000
001001001111
000101010110
001100110000
001111101000
101000100101
010000000010
110011000010
000000001100
010000101011
010101011011
101011010100
010001011011
111100011001
100000111110
110001101010
100111101001
100110001110
110001010101
101100001000
100001000010
000110100001
001010000000
011111100000
111110101111
000001101001
000000111110
101111101001
001010000010
011110010010
101111000111
111110101010
000100001000
000111000000
110010010110
000001111110
010110101010
001010100011
001111011001
111001001111
100100010111
101100001011
100111000110
111010111101
010001011110
101110000011
010111000010
110110001011
111010100011
111100011101
101101101001
110100001000
110001011001
110010100001
111110010110
010100100011
001000011101
001011001010
011100111011
001111100110
001101100110
001011000001
010100100110
100100100111
010100011011
000101110001
010110011111
000001011101
110101011001
001101101010
011111111010
111001100011
100001000111
110110011111
100101010001
011100100010
100100011000
101111001011
111001011000
110000101110
010100100101
110011101000
001101000011
111101100101
011010011011
100110001101
111001111100
001000100010
000101111101
101110011000
001011111010
111100101001
011000101001
001111010111
001100110010
011000011011
110111011000
100100000110
011010110000
110111101111
111000111101
111111100110
000101010010
010101001010
110100110101
011011100101
110110111011
100010111110
100110111010
100011001010
100100100000
101000110110
001010101010
011001101111
001110110000
010001100100
011000100100
001011001011
110111100110
010110010111
001011011010
111100001010
000010001100
011010001111
100100001101
100010011100
000010001000
101001010000
110101001101
010110111100
101001100100
100000111010
010000010001
011101011101
100011110010
100100011111
100011100101
001010010010
000110011111
010000000111
111001101101
010011000010
000001111010
010010001111
101011100001
101100111100
100001000000
110111110010
100110000111
100000111011
111010011110
011011011011
101011000110
011100011001
000101011100
010000101111
100010100001
111000100101
011010010001
110110100011
100000011100
101110101101
000010110100
101011111110
001000100111
101001001010
001111110101
001001000010
001100101110
111000001000
000000100000
000100111110
111111110100
110101001100
001100000010
100011011001
000110000010
100010101101
111110101011
110100000000
000100111001
001111001011
110111011011
001111100010
101111011010
111010011011
100111101010
011011011001
010100000011
001111010001
101010101101
110000011111
001111111111
000110000100
101111101010
101011011101
010001011010
001001011011
101011010010
111010000010
011100101000
101001011010
000111110101
110011011101
101010010011
101100001111
111001010001
100100010110
010100100001
011110110101
110100000111
110101001000
101000010000
110000000011
011111110110
100001010100
011111000101
010010101001
000111100100
001010000110
100100110110
110010101101
010001111101
101100000000
001100000000
011111111110
110001100101
000111001100
011101111110
000100110000
111111111000
101110010001
100111000010
100111011110
000100111010
110101011011
001000111110
101101110110
110110010011
011010100101
001010101111
100110111001
010001111100
010110101000
011000000000
010001011111
010101101111
111001010110
100001001011
110000100111
011100000001
110101100000
110010110010
111010111001
011010111000
101100000110
010100011111
001010111000
101100101101
011000111010
000001001100
001111010010
011010100000
110100110111
101101000100
001110001101
111001101111
`;

// function to count number of times a particular value occurs for a particular bit for each binary number in array
function countBits(array, i) {
    for (var j = 0; j < array.length; j++) {
        if (array[j][i] == '1') {
            count_1++;
        }
        else if (array[j][i] == '0') {
            count_0++;
        }
    }
}

/** Part 1 */

// convert input into an array
var diagnostic_report = INPUT.split(/\n/);

var gamma_rate = '';
var epsilon_rate = '';

// iterate through each bit in the binary numbers in turn
for (var i = 0; i < 12; i++) {
    var count_1 = 0;
    var count_0 = 0;
    var gamma_bit;
    var epsilon_bit;

    countBits(diagnostic_report, i);

    // assign a bit value to the Gamma and Epsilon rates, depending on which value
    // is more prevalent in the array for the current bit being evaluated,
    // and append it to the string
    if (count_1 > count_0) {
        gamma_bit = '1';
        epsilon_bit = '0';
    }
    else if (count_1 < count_0) {
        gamma_bit = '0';
        epsilon_bit = '1';
    }

    gamma_rate = gamma_rate + gamma_bit;
    epsilon_rate = epsilon_rate + epsilon_bit
}

// convert binary numbers into integers, and multiply to get power consumption
gamma_rate = parseInt(gamma_rate, 2);
epsilon_rate = parseInt(epsilon_rate, 2);

var power_consumption = gamma_rate * epsilon_rate;

console.log("Power Consumption = " + power_consumption);

/** Part 2 */

// create copies of the array containing the data
var o2_generator = Array.from(diagnostic_report);
var co2_scrubber = Array.from(diagnostic_report);

// iterate through each bit in the binary numbers in turn
for (var i = 0; i < 12; i++) {
    var count_1 = 0;
    var count_0 = 0;

    // for each array, filter out the values to keep, based on most prevalent value for each bit
    
    countBits(o2_generator, i);

    o2_check: if (o2_generator.length == 1) {
        break o2_check;
    }
    else if (count_1 >= count_0) {
        o2_generator = o2_generator.filter(item => item[i] == '1');
    }
    else if (count_1 < count_0) {
        o2_generator = o2_generator.filter(item => item[i] == '0');
    }

    countBits(co2_scrubber, i);

    co2_check: if (co2_scrubber.length == 1) {
        break co2_check;
    }
    else if (count_1 >= count_0) {
        co2_scrubber = co2_scrubber.filter(item => item[i] == '0');
    }
    else if (count_1 < count_0) {
        co2_scrubber = co2_scrubber.filter(item => item[i] == '1');
    }
}

// convert binary numbers into integers, and multiply to get power consumption
o2_generator = parseInt(o2_generator, 2);
co2_scrubber = parseInt(co2_scrubber, 2);

var life_support = o2_generator * co2_scrubber;

console.log("Life Support = " + life_support);