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 551 Technologies & Applications4 384...

📈 Analytical overview of Telegram channel JavaScript

Channel JavaScript (@javascript) in the English language segment is an active participant. Currently, the community unites 31 439 subscribers, ranking 4 384 in the Technologies & Applications category and 13 551 in the India region.

📊 Audience metrics and dynamics

Since its creation on невідомо, the project has demonstrated rapid growth, gathering an audience of 31 439 subscribers.

According to the latest data from 13 June, 2026, the channel demonstrates stable activity. Although there has been a change in the number of participants by -193 over the last 30 days and by 21 over the last 24 hours, overall reach remains high.

Verification status: Not verified
Engagement rate (ER): The average audience engagement rate is 6.27%. 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 1 972 views. Within the first day, a publication typically gains 796 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 14 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.

31 439

Subscribers

+2124 hours

-537 days

-19330 days

1 972

Post views

~ 79624 hours

~ 1 05148 hours

6.27%

Engagement rate

~ 2

Posts per day

Ads index

beta

Posts Archive

31 431

CHALLENGE

function* fibonacci() {
  let [a, b] = [0, 1];
  while (true) {
    yield a;
    [a, b] = [b, a + b];
  }
}

function* takeWhile(generator, predicate) {
  for (const value of generator) {
    if (!predicate(value)) break;
    yield value;
  }
}

const fib = fibonacci();
const smallFibs = takeWhile(fib, x => x < 20);
console.log([...smallFibs].join(','));

31 431

What is the output?

Anonymous voting

31 431

CHALLENGE

let obj = { name: 'Sarah', age: 25 };
let weakMap = new WeakMap();
let map = new Map();

weakMap.set(obj, 'weak reference');
map.set(obj, 'strong reference');

console.log(weakMap.has(obj));
console.log(map.has(obj));

obj = null;

console.log(weakMap.has(null));
console.log(map.has(null));
console.log(map.size);

31 431

What is the output?

Anonymous voting

31 431

CHALLENGE

const nums = [1, 2, 3];
const obj = { a: 1, b: 2, c: 3 };

function process(...args) {
  const [first, ...rest] = args;
  const { a, ...others } = obj;
  return { first, rest, a, others };
}

const result = process(...nums);
console.log(result.first);
console.log(result.rest.length);
console.log(result.others.b);
console.log(Object.keys(result.others).join(''));
console.log(result.a === nums[0]);

31 431

⚡️ DevHelperAI — AI Assistant for Programmers Speed up solving programming tasks in any language — Python, JavaScript, Java, and more. Powered by ChatGPT Plus, but 3× cheaper! Don’t overpay $20 for ChatGPT Plus — pay just $7.25 and get faster, more accurate answers. Try DevHelperAI now! 👇 First month FREE ! @devhelperai_bot

31 431

What is the output?

Anonymous voting

31 431

CHALLENGE

console.log('1');

setTimeout(() => console.log('2'), 0);

Promise.resolve().then(() => console.log('3'));

setTimeout(() => console.log('4'), 0);

Promise.resolve().then(() => {
  console.log('5');
  return Promise.resolve();
}).then(() => console.log('6'));

console.log('7');

31 431

Prototype pollution 🥃 Exposing the default prototype by calling unsafe recursive functions with untrusted data as input Read ~20mins estimated learn.snyk.io

31 431

What is the output?

Anonymous voting

31 431

CHALLENGE

class StateMachine {
  constructor() {
    this.state = 'idle';
    this.transitions = {
      idle: { start: 'running' },
      running: { pause: 'paused', stop: 'stopped' },
      paused: { resume: 'running', stop: 'stopped' },
      stopped: { reset: 'idle' }
    };
  }
  
  transition(action) {
    const next = this.transitions[this.state]?.[action];
    if (next) this.state = next;
    return this.state;
  }
}

const sm = new StateMachine();
console.log(sm.transition('start'));
console.log(sm.transition('invalid'));
console.log(sm.transition('pause'));
console.log(sm.transition('resume'));
console.log(sm.transition('stop'));
console.log(sm.transition('reset'));

31 431

New career opportunity on the rise! 😆

31 431

What is the output?

Anonymous voting

31 431

CHALLENGE

const values = [null, undefined, '', 0, false, NaN];
const results = [];

for (let val of values) {
  results.push({
    value: val,
    boolean: !!val,
    string: String(val),
    number: Number(val)
  });
}

console.log(results[2].boolean);
console.log(results[3].string);
console.log(results[1].number);

31 431

Interesting idea 🤔 I always thought that front-end development is much harder then backend, but I was having trouble to explain that idea to developers. Today I wanted to check the opinion of the LLM, so called the general expert's opinion. Agreed that front-end is harder for humans, because backend scales mathematically, rule based, and it's not that hard to understand. It's just math... Then I asked, to find a similar analogy for front-end. It nailed. BIOLOGY! ____ Backend scaling: like mathematics: you add more nodes, shard databases, optimize queries - the system grows by formulas and predictable rules. Frontend change: like biology: small mutations (new device, new browser feature, new UX demand) create emergent, often chaotic behavior that must be adapted to case by case. ____ Biology is more difficult then mathematics — mathematics is rule-bound and deterministic, while biology is emergent, full of exceptions, context-dependent, and constantly changing. That’s why front-end (biology-like) feels messier and harder for humans, even if backend (math-like) can be more abstractly deep. Edgar Marukyan

31 431

What is the output?

Anonymous voting

31 431

CHALLENGE

const sym1 = Symbol('test');
const sym2 = Symbol('test');
const obj = {
  [sym1]: 'first',
  [sym2]: 'second',
  regular: 'third'
};

const keys = Object.keys(obj);
const symbols = Object.getOwnPropertySymbols(obj);
const allProps = Reflect.ownKeys(obj);

console.log(keys.length);
console.log(symbols.length);
console.log(allProps.length);
console.log(sym1 === sym2);

31 431

What is the output?

Anonymous voting

31 431

CHALLENGE

const data = {
  name: '',
  age: 0,
  city: null,
  country: undefined,
  isActive: false
};

const getName = () => data.name || 'Unknown';
const getAge = () => data.age ?? 25;
const getCity = () => data.city || 'Default City';
const getCountry = () => data.country ?? 'Default Country';
const getStatus = () => data.isActive || 'inactive';

console.log(`${getName()}-${getAge()}-${getCity()}-${getCountry()}-${getStatus()}`);

31 431

🚬 Apache ECharts 6.0: The Powerful Data Visualization Library 12 years on from its first release, ECharts takes another big step forward. Visualization types span from line, bar and pie charts to 3D graphs, calendars and Sankey diagrams. v6 brings an all-new design language, dynamic theme switching, dark mode support, even more chart types, and more. Be sure to enjoy the 100+ demos and the GitHub repo. Apache Software Foundation