Run results for: Promise vs Async Await

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_5 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.5 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 18

Operating system: iOS 18.5

Device Platform: Mobile

Date tested: one year ago

Benchmark engine: Benchmark.js

Test name	Executions per second
✓ Async Await	8,855,197 Ops/sec
Promise Chain	3,412,844 Ops/sec
Promise.all	2,851,248 Ops/sec

Script Preparation code:


function executePromises() {
  let vals = [];
  Promise.resolve(1)
    .then(val => {
      vals.push(val);
      return Promise.resolve(2);
    })
    .then(val => {
      vals.push(val);
      return Promise.resolve(3);
    })
    .then(val => {
      vals.push(val);
      return Promise.resolve(4);
    })
    .then(val => {
      vals.push(val);
      return Promise.resolve(5);
    })
    .then(val => {
      vals.push(val);
      return Promise.resolve(6);
    })
    .then(val => {
      vals.push(val);
      console.log(vals);
    });
}

async function executeAwaits() {
  const val  = await Promise.resolve(1);
  const val2 = await Promise.resolve(2);
  const val3 = await Promise.resolve(3);
  const val4 = await Promise.resolve(4);
  const val5 = await Promise.resolve(5);
  const val6 = await Promise.resolve(6);
  const vals = [val, val2, val3, val4, val5, val6];
  console.log(vals);
}

function executePromiseAll(){
  Promise.all([
    Promise.resolve(1),
    Promise.resolve(2),
    Promise.resolve(3),
    Promise.resolve(4),
    Promise.resolve(5),
    Promise.resolve(6)
  ]).then((vals, rej) => {
    console.log(vals);
  });
}

Run results for: Promise vs Async Await

Promise Chain

Async Await

Promise.all