Вычислятор чисел Капрекара, считает квадратичные числа (n=2)

kaprekarsCalculator.js

const { Worker, isMainThread, parentPort, workerData } = require('worker_threads');

if (isMainThread) {
  console.log(`Число|Сумма строкой|Квадрат числа|Поток #|Время вычисления в своём потоке (мс)|Время работы потока (мс)`);

  const threadsCount = +process.argv[2] || 2;
  const threads = new Set();

  for (let i = 0; i < threadsCount; i++) {
    threads.add(new Worker(__filename, { workerData: { start: i + 1, step: threadsCount, threadId: i }}));
  }

  for (let worker of threads) {
    worker.on('error', (err) => { throw err; });

    worker.on('exit', () => {
      threads.delete(worker);
      // console.log(`Thread exiting, ${threads.size} running...`);
    });

    worker.on('message', (msg) => console.log(msg));
  }
} else {
  const { start, step, threadId } = workerData;

  let i = BigInt(start);
  let calcTime = Date.now();
  const startTime = Date.now();

  const printFunc = (o, f, s, sq, ct) => {
    parentPort.postMessage(`${o}|${f}+${s}|${sq}|${threadId}|${Date.now() - ct}|${Date.now() - startTime}`);
    calcTime = Date.now();
  }

  while (true) {
    const square = i * i;
    const s = square.toString();

    const [fp, sp] = [s.slice(0, Math.floor(s.length / 2)), s.slice(Math.floor(s.length / 2), s.length)];

    if (i === BigInt(fp) + BigInt(sp)) {
      printFunc(i, fp, sp, square, calcTime);
    } else {
      const [fp1, sp1] = [s.slice(0, Math.ceil(s.length / 2)), s.slice(Math.ceil(s.length / 2), s.length)];

      if (i === BigInt(fp1) + BigInt(sp1)) {
        printFunc(i, fp1, sp1, square, calcTime);
      }
    }

    i += BigInt(step);
  }
}