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

31 441

What is the output?

Anonymous voting

31 441

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);

31 441

What is the output?

Anonymous voting

31 441

CHALLENGE


const str = "JavaScript is Awesome!";

const result = str
  .split(" ")
  .map((word, i) => {
    if (i % 2 === 0) return word.toUpperCase();
    return word.toLowerCase();
  })
  .map((word) => [...word].reverse().join(""))
  .join("-");

console.log(result);

31 441

What is the output?

Anonymous voting

31 441

CHALLENGE


const handler = {
  get(target, prop, receiver) {
    if (prop === 'fullName') {
      return `${Reflect.get(target, 'firstName', receiver)} ${Reflect.get(target, 'lastName', receiver)}`;
    }
    return Reflect.get(target, prop, receiver);
  },
  set(target, prop, value, receiver) {
    if (typeof value !== 'string') {
      return false;
    }
    return Reflect.set(target, prop, value.trim(), receiver);
  },
  has(target, prop) {
    return prop.startsWith('_') ? false : Reflect.has(target, prop);
  }
};

const person = new Proxy({ firstName: '  Clara', lastName: 'Oswald  ', _secret: 'hidden' }, handler);
person.firstName = '  Clara';
person.lastName = '  Oswald';

console.log(person.fullName);
console.log('_secret' in person);
console.log(Reflect.ownKeys(person).length);

31 441

What is the output?

Anonymous voting

31 441

CHALLENGE

const inventory = {
  apples: 5,
  bananas: 12,
  cherries: 0,
  dates: 8,
};

const result = Object.entries(inventory)
  .filter(([_, qty]) => qty > 0)
  .reduce((acc, [fruit, qty]) => {
    acc[fruit] = qty * 2;
    return acc;
  }, {});

const keys = Object.keys(result);
const values = Object.values(result);

console.log(keys.length, values.reduce((sum, v) => sum + v, 0));

31 441

👀 Solid v2.0.0 Beta: The <Suspense> is Over After a long experimental phase, Solid 2.0’s first beta lands with first-class async support where computations can return Promises or async iterables, and the reactive graph suspends and resumes around them natively. <Suspense> is retired in favor of <Loading> for initial renders, and mutations get a first-class action() primitive with optimistic support. For existing users the breaking changes are substantial, but there’s a migration guide. Ryan Carniato

31 441

What is the output?

Anonymous voting

31 441

CHALLENGE

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

function riskyOperation(value) {
  if (value === null) throw new AppError("Null value", 404);
  if (typeof value !== "number") throw new TypeError("Not a number");
  if (value < 0) throw new RangeError("Negative value");
  return value * 2;
}

const inputs = [42, null, "hello", -5];
const results = inputs.map((input) => {
  try {
    return riskyOperation(input);
  } catch (err) {
    if (err instanceof AppError) return `AppError:${err.code}`;
    if (err instanceof TypeError) return `TypeError`;
    if (err instanceof RangeError) return `RangeError`;
    return `UnknownError`;
  }
});

console.log(results);

31 441

What is the output?

Anonymous voting

31 441

CHALLENGE


const transactions = [
  { id: 1, type: "credit", amount: 200 },
  { id: 2, type: "debit",  amount: 50  },
  { id: 3, type: "credit", amount: 150 },
  { id: 4, type: "debit",  amount: 30  },
  { id: 5, type: "credit", amount: 100 },
];

const result = transactions
  .filter(tx => tx.type === "credit")
  .map(tx => ({ ...tx, amount: tx.amount * 1.1 }))
  .reduce((acc, tx) => acc + tx.amount, 0);

console.log(result.toFixed(2));

31 441

What is the output?

Anonymous voting

31 441

CHALLENGE

const product = {
  name: "Laptop",
  price: 1299,
  stock: 42,
  discount: 0,
  category: "Electronics",
};

const filtered = Object.entries(product)
  .filter(([key, value]) => Boolean(value))
  .reduce((acc, [key, value]) => {
    acc[key] = value;
    return acc;
  }, {});

console.log(Object.keys(filtered).length);
console.log(Object.values(filtered).includes(0));
console.log(Object.keys(filtered).join(", "));

31 441

What is the output?

Anonymous voting

31 441

CHALLENGE

const engine = {
  type: "V8",
  displacement: 4.0,
  getInfo() {
    return `${this.type} - ${this.displacement}L`;
  },
  turbo: {
    boost: 12,
    getBoost() {
      return `${this.type ?? "Unknown"} boosted at ${this.boost} psi`;
    },
  },
};

const detached = engine.getInfo;
const turboInfo = engine.turbo.getBoost;

console.log(engine.getInfo());
console.log(engine.turbo.getBoost());
console.log(turboInfo());

31 441

😆

31 441

What is the output?

Anonymous voting

31 441

CHALLENGE

class Registry {
  static #cache = new Map();
  static #instanceCount = 0;
  static defaultTTL;

  static {
    Registry.#cache.set("base", { value: 42, active: true });
    Registry.#instanceCount = 1;
    Registry.defaultTTL = 3600;
    console.log("Static block 1:", Registry.#instanceCount, Registry.defaultTTL);
  }

  static {
    const base = Registry.#cache.get("base");
    Registry.#cache.set("derived", { value: base.value * 2, active: false });
    Registry.#instanceCount++;
    console.log("Static block 2:", Registry.#instanceCount, Registry.#cache.size);
  }

  static getSnapshot() {
    return [...Registry.#cache.entries()]
      .map(([k, v]) => `${k}:${v.value}`)
      .join(", ");
  }
}

console.log("Snapshot:", Registry.getSnapshot());
console.log("TTL:", Registry.defaultTTL);