korzio

   ┌───────────────────────────┐
┌─>│           timers          │ # setTimeout, setInterval
│  └─────────────┬─────────────┘
│  ┌─────────────┴─────────────┐
│  │     pending callbacks     │
│  └─────────────┬─────────────┘
│  ┌─────────────┴─────────────┐
│  │       idle, prepare       │ # system
│  └─────────────┬─────────────┘      ┌───────────────┐
│  ┌─────────────┴─────────────┐      │   incoming:   │

korzio

setTimeout(function first() {
  console.log(1)
}, 1000)

console.log(2)

setTimeout(function second() {
  console.log(3)
}, 2000)

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document.addEventListener('click', () => {
  console.log('click')
})

korzio

const http = require('http') 
const hostname = '127.0.0.1'
const port = 3000
const server = http.createServer((req, res) => {
  res.statusCode = 200 
  res.setHeader('Content-Type', 'text/plain') 
  res.end('Hello World\n')
}) 

server.listen(port, hostname, () => {

korzio

const fs = require('fs')
fs.readFile('./events.js', function callback(err, data) {
  console.log('file has been read')
})

korzio

{
  "compilerOptions": {
    "resolveJsonModule": true,
    /* Basic Options */
    // "incremental": true,                   /* Enable incremental compilation */
    "target": "es5",                          /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019' or 'ESNEXT'. */
    "module": "commonjs",                     /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */
    // "lib": [],                             /* Specify library files to be included in the compilation. */
    // "allowJs": true,                       /* Allow javascript files to be compiled. */
    // "checkJs": true,                       /* Report errors in .js files. */

korzio

function getResponseSize(url) {
  return fetch(url).then(response => {
    const reader = response.body.getReader()
    let total = 0
    return reader.read().then(function processResult(result) {
      if (result.done) return total
      const value = result.value
      total += value.length
      console.log('Received chunk', value)
      return reader.read().then(processResult)

korzio

async function getResponseSizeAsync(url) {
  const response = await fetch(url)
  const reader = response.body.getReader()
  let total = 0
  
  while (true) {
    const result = await reader.read()
    if (result.done) {
      return total
    }

korzio

const { IncomingWebhook } = require('@slack/webhook')
const url = process.env.SLACK_WEBHOOK_URL
const webhook = new IncomingWebhook(url)
// Send the notification
(async () => {
  await webhook.send({
    text: 'I\'ve got news for you...',
  })
})()

korzio

#!/usr/bin/env node
const { description, name, version } = require('./package.json')
  
const options = process.argv.slice(2)
const VERSION_MESSAGE = `${name} ${version}`
const HELP_MESSAGE = `${VERSION_MESSAGE}
${description}

Usage: 
--help    Help documentation