AoC 2022 day 20

const fs = require("fs")
const performance = require("perf_hooks").performance
const eol = require("os").EOL

let startTime = performance.now()
let part1 = (part2 = 0)
const input = fs.readFileSync(__dirname + "/data.txt", "utf8").split(eol)

function decrypt(source, c = 1) {
    const buf = [...source]
    while (c--) {
        for (const n of source) {
            const index = buf.indexOf(n)
            buf.splice(index, 1)
            buf.splice((index + n.num) % buf.length, 0, n)
        }
    }
    const zero = buf.findIndex(({ num }) => num === 0)
    const numbers = [1000, 2000, 3000].map((k) => buf[(zero + k) % buf.length].num)
    return numbers.reduce((s, a) => s + a, 0)
}

let source = input.map((line) => ({ num: Number(line) }))
part1 = decrypt(source)
source = input.map((line) => ({ num: Number(line) * 811589153 }))
part2 = decrypt(source, 10)

let time = performance.now() - startTime
console.log(`Part 1: ${part1}\nPart 2: ${part2}\nTimer: ${time} ms`)