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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

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📈 Análisis del canal de Telegram JavaScript

El canal JavaScript (@javascript) en el segmento lingüístico de Inglés es un actor destacado. Actualmente la comunidad reúne a 31 148 suscriptores, ocupando la posición 4 163 en la categoría Tecnologías y Aplicaciones y el puesto 12 815 en la región India.

📊 Métricas de audiencia y dinámica

Desde su creación el невідомо, el proyecto ha mostrado un crecimiento acelerado, reuniendo a 31 148 suscriptores.

Según los últimos datos del 19 septiembre, 2026, el canal mantiene una actividad estable. En los últimos 30 días la variación de miembros fue de -123, y en las últimas 24 horas de -2, conservando un alto alcance.

  • Estado de verificación: No verificado
  • Tasa de interacción (ER): El promedio de interacción de la audiencia es 6.26%. Durante las primeras 24 horas tras publicar, el contenido suele obtener 2.31% de reacciones respecto al total de suscriptores.
  • Alcance de las publicaciones: Cada publicación recibe en promedio 1 949 visualizaciones. En el primer día suele acumular 718 visualizaciones.
  • Reacciones e interacción: La audiencia responde de forma activa: el promedio de reacciones por publicación es 5.
  • Intereses temáticos: El contenido se centra en temas clave como javascript, console.log(gen.next().value, processdata, remix, acc.

📝 Descripción y política de contenido

El autor describe el recurso como un espacio para expresar opiniones subjetivas:
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

Gracias a la alta frecuencia de actualizaciones (últimos datos recibidos el 20 septiembre, 2026), el canal mantiene la vigencia y un amplio alcance. La analítica demuestra que la audiencia interactúa activamente con el contenido, lo que lo convierte en un punto de referencia dentro de la categoría Tecnologías y Aplicaciones.

31 148
Suscriptores
-224 horas
-367 días
-12330 días
Archivo de publicaciones
What is the output?
Anonymous voting

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" }));

🥶 Patreon has shared the tale of its seven year migration from JavaScript to TypeScript. There's a focus on tooling choices
🥶 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.

What is the output?
Anonymous voting

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);

📈 In The 49MB Web Page, Shubham Bose expresses surprise at finding that loading a single NY Times page results in 422 networ
📈 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.

What is the output?
Anonymous voting

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");

✌️ Temporal: The 9-Year Journey to Fix Time in JavaScript JavaScript’s date/time handling is notoriously messy and libraries
✌️ 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)

✌️ Temporal: The 9-Year Journey to Fix Time in JavaScript JavaScript’s date/time handling is notoriously messy and libraries
✌️ 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)

What is the output?
Anonymous voting

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(" | "));

What is the output?
Anonymous voting

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");

What is the output?
Anonymous voting

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());

What is the output?
Anonymous voting

CHALLENGE

const person = { name: "Carlos", scores: [10, 20, 30] };
const clone = { ...person };

clone.name = "Diana";
clone.scores.push(40);

const snapshot = Object.assign({}, person);
snapshot.name = "Elena";
snapshot.scores.push(50);

console.log(person.name);
console.log(person.scores.length);
console.log(clone.name);
console.log(clone.scores === person.scores);

What is the output?
Anonymous voting