heapwolf

  pa x 630 ops/sec ±1.74% (76 runs sampled)
  pb x 7.28 ops/sec ±1.36% (38 runs sampled)

let Benchmark = require('benchmark')

let suite = new Benchmark.Suite()

heapwolf

The reason your tests is junk is because you are accidentally introducing all kinds of other variables into the environment (just like your other test, when you reverse it, it favors then-ables), too many side effects. Let the framework handle cycles, that's part of its purpose. Also, the end goal isn't for then-ables to out-perform promises, it's just to demonstrate a neat alternative way to create things that can be awaited.

To placate your placation, here is the same test with less noise...

p x 0.86 ops/sec ±0.31% (9 runs sampled)
t x 0.86 ops/sec ±0.16% (9 runs sampled)

heapwolf

function mkPromise(k) {
	return new Promise(resolve => setTimeout(() => resolve(k), 1))
}

function mkThenable(k) {
  return {
    then(done) { setTimeout(() => done(k), 1) }
  };
}

heapwolf

const Benchmark = require('benchmark')

const suite = new Benchmark.Suite()

suite.on('cycle', event => console.log(String(event.target)))
const add = (name, fn) => suite.add(name, fn, { defer: true })

add('p', complete => {
  async function test () {
    const p = new Promise((resolve, reject) => {

heapwolf

async function main () {
  const p = await fetch('https://api.github.com/users/zeke')
  const j = await p.json()
  
  console.log(j)
  
  document.body.innerHTML = `
    <style>
      body {
        padding: 20px 10px;

heapwolf

//
// CSS
//
const style = `
  * { box-sizing: border-box; }
  body { margin: 0 }

  canvas {
    width: 100%;
    height: 100%;

heapwolf

Keybase proof

I hereby claim:

• I am 0x00a on github.
• I am 0x00a (https://keybase.io/0x00a) on keybase.
• I have a public key whose fingerprint is ADDF 4548 FE3F 0087 758C C300 5BAD AA9B 3A31 9032

To claim this, I am signing this object:

heapwolf

#
# After installing Node.js, Get the SDK
#
curl https://s3.amazonaws.com/mozilla-games/emscripten/releases/emsdk-portable.tar.gz ~/Downloads/emsdk-portable.tar.gz
tar -xzf ~/Downloads/emsdk-portable.tar.gz ~/emscripten
cd ~/emscripten

#
# Fetch the latest registry of available tools.
#

heapwolf

foo: {
  const { err, res } = await request('https://quxx.ht')
  
  if (err) {
    // handle error
    break foo
  }
  
  // handle success
}

heapwolf

//
// target.on(type, listener[, options])
//
EventTarget.prototype.on = EventTarget.prototype.addEventListener

//
// target.once(type, listener[, options])
//
EventTarget.prototype.once = function (type, listener, options = {}) {