CHALLENGE ❓

setTimeout(() => console.log('Timeout 1'), 100);

setTimeout(() => {
  console.log('Timeout 2');
  Promise.resolve().then(() => console.log('Promise in Timeout 2'));
}, 50);

Promise.resolve().then(() => console.log('Promise 1'));

setTimeout(() => console.log('Timeout 3'), 150);

console.log('Sync');

✌️ TC39 Advances 10+ ECMAScript Proposals

The architects behind the development of the ECMAScript / JavaScript spec got together again this week (you can see them in this tweet) and they had a packed agenda. Import attributes, Iterator helpers, Promise.try and Regexp modifiers all made it to stage 4, and more besides.

Sarah Gooding (Socket)

CHALLENGE ❓

async function first() {
  console.log('First Start');
  await second();
  console.log('First End');
}

async function second() {
  console.log('Second Start');
}

console.log('Script Start');
first();
setTimeout(() => console.log('Timeout'), 0);
console.log('Script End');

👀 DOCX 9.0: Generate Word .docx Files from JavaScript

The code to lay out documents is verbose but there’s a lot of functionality baked in and there aren’t many other options for this task. Here’s a CodePen-based example to give you an idea. GitHub repo.

Dolan Miu

CHALLENGE ❓

const obj = Object.freeze({
  name: "Alice",
  info: {
    age: 25
  }
});

try {
  obj.name = "Bob";
  obj.info.age = 30;
} catch (e) {
  console.log("Error:", e.message);
}

console.log(obj.name, obj.info.age);

CHALLENGE ❓

function* numberGenerator() {
  let i = 0;
  while (i < 3) {
    yield i++;
  }
}

const gen = numberGenerator();
console.log(gen.next().value);
console.log(gen.return(10).value);
console.log(gen.next().value);

CHALLENGE ❓

function processData({ a = 10, b = 20 } = { a: 30 }) {
  console.log(a, b);
}

processData({ a: 5 });
processData();

✌️ 10 New JS Features You Should Know About

Awesome

CHALLENGE ❓

const obj = {};
Object.defineProperty(obj, 'name', {
  value: 'Alice',
  writable: false,
  configurable: false
});

try {
  obj.name = 'Bob';
  delete obj.name;
  console.log(obj.name);
} catch (e) {
  console.log('Error:', e.message);
}

🤟 Node v20.18.0 (LTS) Released; v20 'Iron' Prepares to Bow Out as Active LTS Release

It’s been a quiet few weeks for official releases. This update marks one of the last in Node 20’s run as the active LTS release, and introduces experimental network inspection support. Node 22 will soon take over the active LTS crown (as per schedule) but what will its codename be given there are no elements starting with J? Amazingly, this question was asked six years ago and it's (probably) going to be Jod.

Michaël Zasso

CHALLENGE ❓

const map = new Map();
const key1 = {};
const key2 = key1;

map.set(key1, "Value for key1");
map.set(key2, "Value for key2");

console.log(map.get({}));
console.log(map.get(key1));