JavaScript

23 May 2025 15:02

🤨 ANSIS 4.0: ANSI Color Library for Everywhere

A library to use the power of ANSI escape sequences for coloring and styling text in many environments including the terminal, Chromium-based browsers, Node, Bun, Deno, and even Next.js. v4.0 is a big upgrade with enough breaking changes to warrant a migration guide for existing users.

webdiscus

JavaScript

22 May 2025 18:50

🙏 To continue delivering more exciting stories, we're kindly asking telegram premium users to help us (boost) take things to the next level.

We need 40 boosts 😭

/channel/javascript?boost

JavaScript

21 May 2025 15:01

🤔 I Think the Ergonomics of Generators is Growing on Me

The author notes generator functions have been widely available in JavaScript for a long time, yet “their practicality hasn’t exactly caught on.” This is a great look at what they are and where they can be useful.

Alex MacArthur

JavaScript

20 May 2025 08:31

CHALLENGE

function modify(obj) {
  obj.a.push(4);
  obj.b = 'changed';
  return obj;
}

const original = { a: [1, 2, 3], b: 'original', c: { deep: true } };
const copy1 = { ...original };
const copy2 = JSON.parse(JSON.stringify(original));

modify(copy1);
console.log(original.a, original.b, copy2.c === original.c);

JavaScript

23 October 2024 15:51

🥶 Write Github Actions workflow files in TypeScript (compiles to YAML)

emmanuelnk

JavaScript

22 October 2024 15:42

🤟 To ensure your Node.js version is secure, use:

npx is-my-node-vulnerable

JavaScript

21 October 2024 15:25

😆 True ...

It's just easy to start.

JavaScript

19 October 2024 08:02

🥂 We Did It – 25K Subscribers!

We're excited to announce that our newsletter reached 25,000 subscribers! This was one of our biggest goals for 2024, and we couldn’t have done it without your amazing support.

Thank you for being part of this journey. We’ve got more exciting content coming, so stay tuned!

JavaScript

18 October 2024 08:30

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));

JavaScript

17 October 2024 08:30

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);
}

JavaScript

16 October 2024 08:30

CHALLENGE ❓

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

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

JavaScript

15 October 2024 08:30

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);

JavaScript

14 October 2024 08:31

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);

JavaScript

13 October 2024 08:30

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');

JavaScript

12 October 2024 08:30

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');

JavaScript

23 May 2025 08:32

CHALLENGE

try {
  const arr = [1, 2, 3];
  
  function processArray() {
    try {
      nonExistentFunction();
    } catch (err) {
      throw new TypeError('Invalid type');
    }
  }
  
  try {
    processArray();
  } catch (err) {
    console.log(err instanceof Error, err instanceof TypeError, err.message);
  }
} catch (finalError) {
  console.log('Caught in outer block:', finalError);
}

JavaScript

22 May 2025 07:40

🥃 We often get feedback asking us to include answers to the quizzes—but honestly, some of them need more explanation than a Marvel movie plot. It’s way better if you use Google or GPT to dig into the questions and uncover the answers like the true quiz detective you are!

JavaScript

21 May 2025 08:31

CHALLENGE

const result = (function() {
  let count = 0;
  
  return {
    increment() {
      return ++count;
    },
    get value() {
      return count;
    },
    reset() {
      const oldCount = count;
      count = 0;
      return oldCount;
    }
  };
})();

result.increment();
result.increment();
console.log(result.reset() + result.value + result.increment());

JavaScript

19 May 2025 08:33

CHALLENGE

function processTransaction(amount) {
  try {
    if (typeof amount !== 'number') {
      throw new TypeError('Amount must be a number');
    }
    if (amount <= 0) {
      throw new RangeError('Amount must be positive');
    }
    return 'Transaction processed';
  } catch (error) {
    if (error instanceof TypeError) {
      return { status: 'Type Error', message: error.message };
    } else if (error instanceof RangeError) {
      return { status: 'Range Error', message: error.message };
    }
    return { status: 'Unknown Error', message: error.message };
  }
}

console.log(processTransaction(-50));

JavaScript

23 October 2024 08:30

CHALLENGE

for (var i = 0; i < 3; i++) {
  setTimeout(() => console.log(i), 100);
}

JavaScript

22 October 2024 08:30

CHALLENGE ❓

const sym = Symbol('unique');
const obj = {
  [sym]: 'Secret',
  public: 'Visible'
};

console.log(Object.keys(obj));
console.log(obj[Symbol('unique')]);

JavaScript

21 October 2024 08:30

CHALLENGE ❓

Promise.resolve(1)
  .then(value => {
    console.log(value);
    throw new Error('Something went wrong');
  })
  .then(() => {
    console.log('This will not run');
  })
  .catch(error => {
    console.log('Caught:', error.message);
    return 42;
  })
  .then(value => {
    console.log('Recovered with:', value);
  });

JavaScript

18 October 2024 15:17

👀 The Story of Web Framework Hono, By Its Creator

Hono is a neat, lightweight framework designed to run on any JavaScript runtime that has been picking up steam in the past year. You can create a simple app reminiscent of Express.js, say, but run it on Cloudflare Workers, Deno, Bun, or Node. It’s in heavy use all over the place, and has lots of interesting features like letting you write HTML with JSX.

Yusuke Wada

JavaScript

17 October 2024 15:49

🤟 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

JavaScript

16 October 2024 11:17

✌️ 10 New JS Features You Should Know About

Awesome

JavaScript

15 October 2024 15:34

💻 Does Deno 2 really uncomplicate JavaScript?

Beyond Fireship

JavaScript

14 October 2024 17:40

🔥 The WordPress ecosystem has lost its mind…

JavaScript

13 October 2024 15:22

👀 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

JavaScript

12 October 2024 15:20

✌️ 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)

JavaScript

11 October 2024 08:30

CHALLENGE ❓

setTimeout(() => {
  console.log('Timeout');
  Promise.resolve().then(() => console.log('Promise after Timeout'));
}, 0);

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

console.log('End of script');