sinedied

// Usage: fastRead('Lorem ipsum dolor sit amet')
function fastRead(text, left = '<b>', right = '</b>') {
  return text?.replace(/[A-Za-zÀ-ÖØ-öø-ÿ0-9]+/gm, (word) => {
    const split = word.length > 3 ? Math.ceil(word.length / 2) : 1;
    return left + word.substring(0, split) + right + word.substring(split);
  });
}

rauschma

// From callbacks to Promises to async functions

function callbackFunc(x, callback) {
  f1(x, (err1, result1) => {
    if (err1) {
      console.error(err1);
      callback(err1);
      return;
    }
    f2(result1, (err2, result2) => {

ceejbot

ES module use cases

• Alice is writing a new library, and she is excited to use the new ES6 syntax. However, she would like to use an older but still good package she found on npm, that exports its interface using CommonJS. She does so easily after reading the NodeJS documentation on how to do this.

• Bob is updating a module for his work, and he needs to support existing CommonJS-using codebases as well as a new project that prefers to stick with ES6 for static analysis reasons. He publishes a package that exports both kinds of interfaces.

• Carol is updating her popular code coverage reporting tool for the new world. She uses the ESM loader hooks to instrument test code as it is imported so she can get code coverage reporting on par with what she has for CommonJS.

• David is writing a transpiler. He writes a custom hook that transpiles source as it's loaded from his language to JavaScript.

davidgilbertson

function logColor(color, args) {
    console.log(`%c ${args.join(' ')}`, `color: ${color}`);
}

const log = {
  aliceblue: (...args) => { logColor('aliceblue', args)},
  antiquewhite: (...args) => { logColor('antiquewhite', args)},
  aqua: (...args) => { logColor('aqua', args)},
  aquamarine: (...args) => { logColor('aquamarine', args)},
  azure: (...args) => { logColor('azure', args)},

jkrems

Modules - History & Future

History

• Early work by Ihab Awad (Google) and Kris Kowal (FastSoft)
  • https://twitter.com/kriskowal/status/943547614158450688
  • Hermetic eval presentation: https://docs.google.com/presentation/d/1KlPxgocvzpTq44KTF4xZ6TnzGRsy628hP5he7bXVB3I/edit#slide=id.i0
• 2009-09: 2nd draft of module strawman, still very close to "closures as modules", export x = 42
  • https://esdiscuss.org/topic/hermetic-evaluation-modules-strawman

• https://docs.google.com/document/u/1/pub?id=1hNv1SHh_v_6nD1QBd6pySUJ2U5roAELzW5cqD2tt_WM

AlexLakatos

var kb = require("ble_hid_keyboard");
NRF.setServices(undefined, { hid : kb.report });
var reset_timer;
var next = "n";
var prev = "p";

function sendCharNext(){
        if (next == next.toLowerCase()){
            sk = 0;
        } else {

StevenACoffman

Async / Await in 7 seconds

by Wassim Chegham (@manekinekko)

From this awesome animation, originally from this tweet

Callbacks (continuation passing style)

getData( a => {
	getMoreData(a, b => {

Brocco

const pixels = ['r','g','b','a','r','g','b','a','r','g','b','a'];

const propMap = ['r', 'g', 'b', 'a'];

const rgbas = pixels.reduce((acc, curr, i) => {
  const mod = i%4;
  switch (mod) {
    case 0:
      return [...acc, {r: curr}];
    default:

mgechev

/* tslint:disable */

const program =

`
module "login"
  go to "app/login"
  fill "mgechev+18@gmail.com" in "#username"
  fill "foobar" in "#password"
  click "#login"

PaulKinlan

(function() {
  let canvas = document.querySelector('canvas');
  // Optional frames per second argument.
  let stream = canvas.captureStream(25);
  var options = {mimeType: 'video/webm; codecs=vp9'};
  let recorder = new MediaRecorder(stream, options);
  let blobs = [];

  function download(blob) {
    var url = window.URL.createObjectURL(blob);