prall.js

const { performance } = require("perf_hooks");
const { setTimeout } = require("timers/promises");

function timeit(start, end) {
  console.log(`Execution time: ${start - end} ms.`);
}

async function parallelPromises(promiseA, promiseB, promiseC) {
  const start = performance.now();
  const results = [await promiseA, await promiseB, await promiseC];
  console.log(results);
  const end = performance.now();
  timeit(start, end);
}

async function parallelAll(promiseA, promiseB, promiseC) {
  const start = performance.now();
  const results = await Promise.allSettled([promiseA, promiseB, promiseC]);
  console.log(results);
  const end = performance.now();
  timeit(start, end);
}

parallelPromises(setTimeout(3000, 1), setTimeout(2000, 2), setTimeout(1000, 3));

parallelAll(setTimeout(3000, 1), setTimeout(2000, 2), setTimeout(1000, 3));

async function sequential(args1, args2, args3) {
  const start = performance.now();
  const results = [
    await setTimeout(...args1),
    await setTimeout(...args2),
    await setTimeout(...args3),
  ];
  console.log(results);
  const end = performance.now();
  timeit(start, end);
}

sequential([3000, 1], [2000, 2], [1000, 3]);