Sauloxd

Starving the Event Loop with microtasks

Sparked from this twitter conversation when talking about doing fast async rendering of declarative UIs in Preact

These examples show how it's possible to starve the main event loop with microtasks (because the microtask queue is emptied at the end of every item in the event loop queue). Note that these are contrived examples, but can be reflective of situations where Promises are incorrectly expected to yield to the event loop "because they're async".

• setTimeout-only.js is there to form a baseline
• chained-promises.js shows the event loop being starved when many microtasks are queued at once
• promises-returning-promises.js shows chained .then() calls starving the event loop

Sauloxd

function findLargerInAofK(A_array, K_array) {
  const A = A_array.sort((a, b) => a - b)

  return K_array.map(K => {
    let supportArrayIndex = [0, A.length - 1]

    while (true) {
      let middleIndex = Math.ceil((supportArrayIndex[1] + supportArrayIndex[0]) / 2)

      if (K >= A[A.length - 1]) return 0

Sauloxd

cd repository
git checkout --orphan orphan_name
git rm -rf .
rm '.gitignore'
echo "#Title of Readme" > README.md
git add README.md
git commit -a -m "Initial Commit"
git push origin orphan_name

Sauloxd

const getDayMonthYear = (date) => ({
  day: date.getDate(),
  month: date.getMonth(),
  year: date.getFullYear()
});

const pastBirthday = (birthday, today) => (today.month >= birthday.month) && (today.day >= birthday.day)

const age = (birthdayString) => {
  const today = getDayMonthYear(new Date());

Sauloxd

language: node_js
cache:
  directories:
  - node_modules
script:
- npm test
- npm run build
before_deploy: pip install --user awscli
deploy:
  provider: script

Sauloxd

import styled, { createGlobalStyle } from 'styled-components';

export const theme = {
  emoji: 'emoji',
  emojiSuggestions: 'emojiSuggestions',
  emojiSuggestionsEntry: 'emojiSuggestionsEntry',
  emojiSuggestionsEntryFocused: 'emojiSuggestionsEntryFocused',
  emojiSuggestionsEntryText: 'emojiSuggestionsEntryText',
  emojiSuggestionsEntryIcon: 'emojiSuggestionsEntryIcon',
  emojiSelect: 'emojiSelect',

Sauloxd

const util = require('util')
const https = require('https');
const CIRCLE_CI_TOKEN = 'Add you user token here'; //https://app.circleci.com/settings/user/tokens
const log = obj => console.log(util.inspect(obj, {showHidden: false, depth: null}));
const circleCiApi = makeCircleCiApi();
'github/QultureRocks/QultureApp'
const versionControlSystem = 'github';
const orgName = 'OrganizationName'; // If it's not in an org, fix projectSlug
cosnt repoName = 'RepoName'