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 573 Technologies & Applications4 377...

📈 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 4 377 in the Technologies & Applications category and 13 573 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 11 June, 2026, the channel demonstrates stable activity. Although there has been a change in the number of participants by -198 over the last 30 days and by 17 over the last 24 hours, overall reach remains high.

Verification status: Not verified
Engagement rate (ER): The average audience engagement rate is 6.20%. 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 1 949 views. Within the first day, a publication typically gains 797 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 12 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

+1724 hours

-587 days

-19830 days

1 949

Post views

~ 79724 hours

~ 1 04548 hours

6.20%

Engagement rate

~ 2

Posts per day

Ads index

beta

Posts Archive

31 441

What is the output?

Anonymous voting

31 441

CHALLENGE


const temperature = {
  celsius: 22,
  [Symbol.toPrimitive](hint) {
    if (hint === 'number') {
      return this.celsius;
    }
    if (hint === 'string') {
      return `${this.celsius}°C`;
    }
    return this.celsius + 273.15;
  }
};

console.log(`Temp: ${temperature}`);
console.log(temperature + 0);
console.log(temperature * 2);
console.log(+temperature);

31 441

🤟 Evolving the Node.js Release Schedule: A Work in Progress The Node.js team has long been discussing shifting Node to a new schedule of one major release per year (instead of two), removing the odd/even distinction, and making every release LTS (with a prior 11 months of alpha/current status). This is a preview post not intended for final publication till April, so things are subject to change (backup version). The Node.js Team

31 441

What is the output?

Anonymous voting

31 441

CHALLENGE

class EventEmitter {
  #listeners = new WeakMap();
  #registry = new FinalizationRegistry((label) => {
    console.log(`Cleaned up: ${label}`);
  });

  subscribe(target, callback) {
    if (!this.#listeners.has(target)) {
      this.#listeners.set(target, []);
    }
    this.#listeners.get(target).push(callback);
    this.#registry.register(target, target.name ?? "unknown");
  }

  emit(target) {
    const cbs = this.#listeners.get(target);
    if (cbs) cbs.forEach(cb => cb());
  }
}

const emitter = new EventEmitter();
let obj1 = { name: "sensor" };
let obj2 = { name: "timer" };

const ws = new WeakSet([obj1, obj2]);

emitter.subscribe(obj1, () => console.log("sensor fired"));
emitter.subscribe(obj2, () => console.log("timer fired"));
emitter.subscribe(obj1, () => console.log("sensor logged"));

emitter.emit(obj1);

console.log(ws.has(obj1));
obj1 = null;
console.log(ws.has({ name: "sensor" }));

31 441

🥶 Patreon has shared the tale of its seven year migration from JavaScript to TypeScript. There's a focus on tooling choices that might be useful if you're making a similar shift.

31 441

What is the output?

Anonymous voting

31 441

CHALLENGE


function Vehicle(make, model, year) {
  this.make = make;
  this.model = model;
  this.year = year;
  this.describe = function () {
    return `${this.year} ${this.make} ${this.model}`;
  };
}

Vehicle.prototype.age = function (currentYear) {
  return currentYear - this.year;
};

const car = new Vehicle("Toyota", "Supra", 1998);
const bike = new Vehicle("Harley", "Sportster", 2005);

console.log(car.describe());
console.log(bike.age(2025));
console.log(car.constructor === Vehicle);
console.log(Object.getPrototypeOf(car) === Vehicle.prototype);

31 441

📈 In The 49MB Web Page, Shubham Bose expresses surprise at finding that loading a single NY Times page results in 422 network requests and 49 megabytes of data transferred. He reflects on the problems that have led to this being a common experience on news sites.

31 441

What is the output?

Anonymous voting

31 441

CHALLENGE


const p1 = new Promise((resolve) => {
  console.log("A");
  resolve("B");
});

const p2 = p1.then((val) => {
  console.log(val);
  return "C";
});

p2.then((val) => {
  console.log(val);
});

console.log("D");

31 441

✌️ Temporal: The 9-Year Journey to Fix Time in JavaScript JavaScript’s date/time handling is notoriously messy and libraries like Moment.js became popular as a way to work around it. In 2017, Maggie Johnson-Pint, a maintainer of Moment.js, proposed the Temporal API to fix date/time handling for good, and we’re mostly there (support is growing, with Safari and Node to catch up). Jason Williams (Bloomberg)

31 441

What is the output?

Anonymous voting

31 441

CHALLENGE



class AppError extends Error {
  constructor(message, statusCode) {
    super(message);
    this.name = this.constructor.name;
    this.statusCode = statusCode;
  }
}

class ValidationError extends AppError {
  constructor(message) {
    super(message, 400);
    this.fields = [];
  }
}

function riskyOperation(value) {
  if (value === null) throw new ValidationError("Null value");
  if (value < 0) throw new AppError("Negative value", 422);
  return value * 2;
}

const results = [];

for (const val of [10, null, -5, 3]) {
  try {
    results.push(riskyOperation(val));
  } catch (e) {
    if (e instanceof ValidationError) {
      results.push(`Validation:${e.statusCode}`);
    } else if (e instanceof AppError) {
      results.push(`App:${e.statusCode}`);
    } else {
      results.push("Unknown");
    }
  }
}

console.log(results.join(" | "));

31 441

What is the output?

Anonymous voting

31 441

CHALLENGE


const p1 = new Promise((resolve) => {
  console.log("A");
  resolve("X");
});

const p2 = p1.then((val) => {
  console.log("B");
  return val + "Y";
});

const p3 = p2.then((val) => {
  console.log("C:", val);
});

console.log("D");

31 441

What is the output?

Anonymous voting

31 441

CHALLENGE

"use strict";

function createCounter() {
  let count = 0;

  return {
    increment() { count++; },
    decrement() { count--; },
    getCount() { return count; },
    reset: () => { count = 0; }
  };
}

const counter = createCounter();
counter.increment();
counter.increment();
counter.increment();
counter.decrement();

const { getCount, reset } = counter;

console.log(getCount());
reset();
console.log(counter.getCount());

31 441

🚨 𝟭𝟱𝟬+ 𝗚𝗶𝘁𝗛𝘂𝗯 𝗿𝗲𝗽𝗼𝘀𝗶𝘁𝗼𝗿𝗶𝗲𝘀 𝗰𝗼𝗺𝗽𝗿𝗼𝗺𝗶𝘀𝗲𝗱 𝗯𝘆 𝗚𝗹𝗮𝘀𝘀𝗪𝗼𝗿𝗺 𝗠𝗮𝗹𝘄𝗮𝗿𝗲