AoC 2022 day 5

const fs = require('fs');
const eol = require('os').EOL;

const startTime = new Date().getTime();
let part1 = part2 = "";
let time = 0;
let [rows, moves] = fs.readFileSync(__dirname + "/data.txt", 'utf8').split(eol + eol);

rows = rows.split(eol);
rows.pop();

let numColl = (rows[0].length + 1) / 4;
let stacksMaster = new Array(numColl).fill().map(() => []);

// fill stacks
for (let row of rows) {
    for (let i = 0; i < numColl; i++) {
        let crate = row[4 * i + 1];
        if (crate !== ' ') {
            stacksMaster[i].push(crate);
        }
    }
}

// parse moves
moves = moves.split(eol).map(val => {
    let temp = val.split('from');
    return {
        amount: temp[0].split('move ')[1],
        from: temp[1].split('to')[0] - 1,
        to: temp[1].split('to')[1] - 1,
    }
})

// part1
let stacks = JSON.parse(JSON.stringify(stacksMaster));
for (let move of moves) {
    for (let i = 0; i < move.amount; i++) {
        let crate = stacks[move.from].shift();
        stacks[move.to].unshift(crate);
    }
}

for (let stack of stacks) {
    if (stack.length > 0) {
        part1 += stack[0];
    }
}

// part1
stacks = JSON.parse(JSON.stringify(stacksMaster));
for (let move of moves) {
    let stack = stacks[move.from].splice(0, move.amount);
    stacks[move.to].unshift(...stack);
}

for (let stack of stacks) {
    if (stack.length > 0) {
        part2 += stack[0];
    }
}

time = new Date().getTime() - startTime;

console.log(`Part 1: ${part1}\nPart 2: ${part2}\nTimer: ${time} ms`);