✌️ Union, Intersection, Difference, and More Coming to JavaScript Sets

Set was introduced back in ECMAScript 2015 (a.k.a. ES6) but only had some basic methods built-in. Phil looks at what sets can do and what new features are on the way.

PHIL NASH

❓ CHALLENGE

const string = "abacabadabacaba";
const result = string.split("a").length - 1;
console.log(result);

🟣🖐 ModularAdmin: Free Bootstrap 4 Dashboard Theme
HTML version

ModularAdmin is an open source dashboard theme built in a modular way. That makes it easy to scale, modify and maintain.

modularcode

❓ CHALLENGE

const product = {
  name: "Laptop",
  price: 1000,
  discount: function(percentage) {
    return this.price * (percentage / 100);
  }
};
const result = product.discount(10);
console.log(result);

Nice 🔥

Union, intersection, difference, and more are coming to JavaScript Sets

❓ CHALLENGE

const x = [1, 2, 3];
const y = x;
y.push(4);
console.log(x);

💻 JSR first impressions

JSR is a new package repository being introduced by the team at Deno that aims to solve many problems in the Javascript eco-system. I was invited to take part in very early access to it and want to share my impressions.

Kitson P. Kelly

❓ CHALLENGE

let i = 0;
for (; i < 5; i++) {
  setTimeout(() => console.log(i), 0);
}

📣 The React Team Shares What It's Been Working On

Work on React Compiler has progressed with it now powering Instagram’s prod site ('React 19 Will Be Compiled' goes into depth on what the compiler means for most React devs). We also learn React 19 is on the way and will include breaking changes to support things like Web Components.

THE REACT.JS CORE TEAM

❓ CHALLENGE

const num = 8;
const obj = {
  num: 10,
  inner: {
    num: 6,
    getNum: function() {
      return this.num;
    }
  }
};
console.log(obj.inner.getNum());
const getNum = obj.inner.getNum;
console.log(getNum());

🤟 Node.js's 2023 Summarized

Rafael, of the Node.js TSC and Fastify core team, shares a useful update on the evolution of Node.js over the past year, how the team ensures Node is well tested and reliable, changes to Node’s vendor dependencies (of which it gained three in 2023), as well as enhancements to Node’s security and Web presence.

RAFAEL GONZAGA

❓ CHALLENGE

const person = {};
person.name.toUpperCase();
console.log(person.name);

😂 Pac-Man in JavaScript in 1 Hour

I felt old when Ania said “if you’ve never played Pac-Man before..” 😅 – nonetheless, she’s back with another of her fantastic, thorough walkthroughs.

ANIA KUBÓW

❓ CHALLENGE

function fetchData(url) {
  return new Promise((resolve, reject) => {
    setTimeout(() => {
      if (url.startsWith('https://api.example.com')) {
        resolve({ data: 'Some data' });
      } else {
        reject(new Error('Invalid URL'));
      }
    }, 1000);
  });
}

fetchData('https://api.example.com/data')
  .then(response => console.log(response.data))
  .catch(error => console.error(error));