Available now! Telegram Research 2025 β the year's key insights 
JavaScript
A resourceful newsletter featuring the latest and most important news, articles, books and updates in the world of #javascript π Don't miss our Quizzes! Let's chat: @nairihar
Show moreπ 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.
π Audience metrics and dynamics
Since its creation on Π½Π΅Π²ΡΠ΄ΠΎΠΌΠΎ, 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.
π Description and content policy
The author describes the resource as a platform for expressing subjective opinions:
βA resourceful newsletter featuring the latest and most important news, articles, books and updates in the world of #javascript π Don't miss our Quizzes!
Let's chat: @nairiharβ
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.
class Session {
#id;
constructor(id) {
this.#id = id;
}
getId() { return this.#id; }
}
const activeSessions = new WeakSet();
const s1 = new Session("user_42");
const s2 = new Session("user_99");
let s3 = new Session("user_07");
activeSessions.add(s1);
activeSessions.add(s2);
activeSessions.add(s3);
console.log(activeSessions.has(s1)); // line A
console.log(activeSessions.has(s3)); // line B
s3 = null;
console.log(activeSessions.has(s3)); // line C
activeSessions.delete(s2);
console.log(activeSessions.has(s2)); // line D
console.log(activeSessions.size); // line E
const compose = (...fns) => (x) => fns.reduceRight((acc, fn) => fn(acc), x);
const pipe = (...fns) => (x) => fns.reduce((acc, fn) => fn(acc), x);
const double = (x) => x * 2;
const addTen = (x) => x + 10;
const square = (x) => x * x;
const negate = (x) => -x;
const transform1 = compose(negate, square, addTen, double);
const transform2 = pipe(double, addTen, square, negate);
const input = 3;
console.log(transform1(input));
console.log(transform2(input));
console.log(transform1(input) === transform2(input));
class Vehicle {
constructor(type) {
this.type = type;
}
describe() {
return `I am a ${this.type}`;
}
}
class Car extends Vehicle {
constructor(brand) {
super("car");
this.brand = brand;
}
describe() {
return `${super.describe()} made by ${this.brand}`;
}
}
const myCar = new Car("Toyota");
console.log(myCar.describe());
console.log(myCar instanceof Car);
console.log(myCar instanceof Vehicle);
console.log(Object.getPrototypeOf(Car) === Vehicle);
function testScope() {
var x = 'outer';
let y = 'outer';
if (true) {
var x = 'inner';
let y = 'inner';
console.log(x, y);
}
console.log(x, y);
}
testScope();const user = {
name: 'Sarah',
profile: {
settings: {
theme: 'dark'
}
}
};
const config = {
name: 'John',
profile: null
};
console.log(user.profile?.settings?.theme);
console.log(config.profile?.settings?.theme);
console.log(user.profile?.preferences?.language);
console.log(config.profile?.settings?.theme ?? 'light');const user = {
name: 'Sarah',
age: 25,
greet() {
return `Hello, I'm ${this.name}`;
}
};
const keys = Object.keys(user);
const values = Object.values(user);
const entries = Object.entries(user);
console.log(keys.length);
console.log(values.includes('Sarah'));
console.log(entries[2][0]);
function createUser(name = 'Guest', age = 0, active = true) {
return { name, age, active };
}
const users = [
createUser('Sarah', 25),
createUser('Mike'),
createUser('Emma', undefined, false),
createUser(null, 30)
];
console.log(users.map(u => `${u.name}-${u.age}-${u.active}`).join('|'));
