Function square_sum

ch2-patterns/worker.js:10–14

(max)

const commands = {
  async square_sum(max) {
    await sleep(Math.random() * 100); // <3>
    let sum = 0; for (let i = 0; i < max; i++) sum += Math.sqrt(i);
    return sum;
  },
  async fibonacci(limit) {
    await sleep(Math.random() * 100);
    let prev = 1n, next = 0n, swap;