JavaScript

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A resourceful newsletter featuring the latest and most important news, articles, books and updates in the world of #javascript 🚀 Don't miss our Quizzes! Let's chat: @nairihar

India13 579 Technologies & Applications4 382...

📈 Analytical overview of Telegram channel JavaScript

Channel JavaScript (@javascript) in the English language segment is an active participant. Currently, the community unites 31 441 subscribers, ranking 4 382 in the Technologies & Applications category and 13 579 in the India region.

📊 Audience metrics and dynamics

Since its creation on невідомо, the project has demonstrated rapid growth, gathering an audience of 31 441 subscribers.

According to the latest data from 12 June, 2026, the channel demonstrates stable activity. Although there has been a change in the number of participants by -211 over the last 30 days and by -26 over the last 24 hours, overall reach remains high.

Verification status: Not verified
Engagement rate (ER): The average audience engagement rate is 6.22%. Within the first 24 hours after publication, content typically collects 2.53% reactions from the total number of subscribers.
Post reach: On average, each post receives 1 955 views. Within the first day, a publication typically gains 794 views.
Reactions and interaction: The audience actively supports content: the average number of reactions per post is 7.
Thematic interests: Content is focused on key topics such as javascript, console.log(gen.next().value, processdata, remix, acc.

📝 Description and content policy

The author describes the resource as a platform for expressing subjective opinions:
“A resourceful newsletter featuring the latest and most important news, articles, books and updates in the world of #javascript 🚀 Don't miss our Quizzes! Let's chat: @nairihar”

Thanks to the high frequency of updates (latest data received on 13 June, 2026), the channel maintains relevance and a high level of publication reach. Analytics show that the audience actively interacts with content, making it an important point of influence in the Technologies & Applications category.

31 441

Subscribers

-2624 hours

-807 days

-21130 days

1 955

Post views

~ 79424 hours

~ 1 04248 hours

6.22%

Engagement rate

~ 2

Posts per day

Ads index

beta

Posts Archive

31 444

🌲 An Advanced Retry Mechanism in Node.js with Kafka Have you ever wondered how systems are designed to ensure reliable event delivery and processing? How can we minimise event loss to a very low level: or even achieve near-zero message loss and highly reliable processing? nairihar

31 444

What is the output?

Anonymous voting

31 444

CHALLENGE

function memoize(fn) {
  const cache = new Map();
  return function(...args) {
    const key = JSON.stringify(args);
    if (cache.has(key)) {
      return cache.get(key);
    }
    const result = fn.apply(this, args);
    cache.set(key, result);
    return result;
  };
}

const fibonacci = memoize(function(n) {
  if (n <= 1) return n;
  return fibonacci(n - 1) + fibonacci(n - 2);
});

console.log(fibonacci(10));
console.log(fibonacci.cache?.size || 'undefined');

31 444

🌲 The State of JavaScript 2025: Backend Frameworks The results of the popular annual JavaScript survey are out, and we’re focusing on the most relevant bit to Node.js: backend frameworks. Express still leads the way, but NestJS continues to grow rapidly. Meanwhile, Hono comes top in developer satisfaction. Devographics

31 444

What is the output?

Anonymous voting

31 444

CHALLENGE

const obj1 = { a: 1, b: { c: 2 } };
const obj2 = { ...obj1 };
const obj3 = obj1;

obj2.a = 10;
obj2.b.c = 20;
obj3.b.c = 30;

console.log(obj1.a);
console.log(obj1.b.c);
console.log(obj2.a);
console.log(obj2.b.c);
console.log(obj3.a);
console.log(obj3.b.c);

31 444

👀 Introducing LibPDF: PDF Parsing and Generation from TypeScript LibPDF bills itself as ‘the PDF library TypeScript deserves’ and supports parsing, modifying, signing and generating PDFs with a modern API in Node, Bun, and the browser. GitHub repo. Documenso

31 444

What is the output?

Anonymous voting

31 444

CHALLENGE

class DataProcessor {
  static #cache = new Map();
  static #initialized = false;
  
  static {
    console.log('First block');
    this.#cache.set('default', 'value1');
  }
  
  static {
    console.log('Second block');
    this.#cache.set('config', 'value2');
    this.#initialized = true;
  }
  
  static getStatus() {
    return `${this.#cache.size}-${this.#initialized}`;
  }
}

console.log(DataProcessor.getStatus());

31 444

CHALLENGE

const numbers = [1, 2, 3, 4, 5, 6];

const result = numbers
  .filter(n => n % 2 === 0)
  .map(n => n * n)
  .reduce((acc, val) => {
    console.log(`Processing: ${val}, Accumulator: ${acc}`);
    return acc + val;
  }, 0);

console.log(`Final result: ${result}`);

31 444

🌪 GitHub is exploring solutions to tackle low-quality contributions, which could include giving you the option to disable PRs entirely or at least restrict them to collaborators. Got opinions? Join the discussion.

31 444

What is the output?

Anonymous voting

31 444

CHALLENGE

const target = { name: "Sarah", age: 25 };

const handler = {
  get(obj, prop) {
    if (prop === 'greeting') {
      return `Hello, I'm ${obj.name}`;
    }
    return obj[prop]?.toString().toUpperCase() || 'UNKNOWN';
  },
  
  set(obj, prop, value) {
    if (typeof value === 'string') {
      obj[prop] = value.toLowerCase();
    } else {
      obj[prop] = value * 2;
    }
    return true;
  }
};

const proxy = new Proxy(target, handler);
console.log(proxy.name);
proxy.city = "Boston";
proxy.score = 15;
console.log(proxy.greeting);
console.log(proxy.city + " " + proxy.score);

31 444

👀 Heat.js 5.0: A Flexible Heat Map Rendering Solution Generate customized interactive heatmaps (think GitHub contributions graph), or render heatmaps as lines and bar charts. The site is packed with demos to enjoy. GitHub repo. William Troup

31 444

What is the output?

Anonymous voting

31 444

CHALLENGE

let counter = 0;

const increment = () => ++counter;
const getValue = () => counter;

const obj = {
  get value() { 
    increment();
    return getValue();
  }
};

console.log(obj.value);
console.log(obj.value);
console.log(counter);

31 444

⁉️ How Not to Parse Numbers in JavaScript Why use a proper locale-aware API to parse numbers when you can hand-roll a maze of string splits, separator swaps, and implicit type coercions that silently break on edge cases? Remy Porter (The Daily WTF)

31 444

What is the output?

Anonymous voting

31 444

CHALLENGE

const memoize = (fn) => {
  const cache = new Map();
  return (...args) => {
    const key = JSON.stringify(args);
    if (cache.has(key)) return cache.get(key);
    const result = fn(...args);
    cache.set(key, result);
    return result;
  };
};

const fibonacci = memoize((n) => {
  if (n <= 1) return n;
  return fibonacci(n - 1) + fibonacci(n - 2);
});

console.log(fibonacci(10));
console.log(fibonacci(5));
console.log(fibonacci(10));

31 444

✌️ Four Heavyweights Drop Updates Four stalwarts of the JavaScript ecosystem all shipped notable releases this week, and odds are you're using at least one of them: • Gatsby v5.16 proves Gatsby, once considered neck-and-neck with Next.js in the React world, is not 'dead'. The headline feature is React 19 support. • Babel 7 just shipped its final release. "After years in the making, Babel 8 is finally ready," in release candidate form, at least. • Rspress 2.0 is a major release for the high-performance Rust-powered, but JavaScript-facing, static site generator. • Lodash 4.17.23 sounds minor, but it's a 'security reset' for the still heavily used utility library and is designed to provide a base for a longer future.