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

31 426

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");

31 426

What is the output?

Anonymous voting

31 426

CHALLENGE


const str = "  Hello, World!  ";

const result = str
  .trim()
  .split(", ")
  .map((word, i) => {
    return i === 0
      ? word.toUpperCase()
      : word.replace(/!$/, "").split("").reverse().join("") + "?";
  })
  .join(" | ");

const [first, ...rest] = result.split(" | ");
const final = `${first} | ${rest.join(" & ")}`;

console.log(final);

31 426

What is the output?

Anonymous voting

31 426

CHALLENGE


function checkTDZ() {
  console.log(typeof undeclaredVar);

  try {
    console.log(typeof letVar);
  } catch (e) {
    console.log(`Caught: ${e.constructor.name}`);
  }

  let letVar = "initialized";

  const result = (() => {
    let x = 10;
    return function () {
      let x = x + 5;
      return x;
    };
  })();

  try {
    console.log(result());
  } catch (e) {
    console.log(`Caught: ${e.constructor.name}`);
  }
}

checkTDZ();

31 426

What is the output?

Anonymous voting

31 426

CHALLENGE

const curry = (fn) => {
  const arity = fn.length;
  return function curried(...args) {
    if (args.length >= arity) {
      return fn(...args);
    }
    return (...moreArgs) => curried(...args, ...moreArgs);
  };
};

const volume = (l, w, h) => l * w * h;
const curriedVolume = curry(volume);

const withLength5 = curriedVolume(5);
const withLength5Width3 = withLength5(3);

console.log(typeof withLength5);
console.log(typeof withLength5Width3);
console.log(withLength5Width3(2));
console.log(curriedVolume(4)(6)(2));

31 426

👀 FluidCAD (above) is a new project bringing parametric CAD to the JavaScript world where you can write code to create/manipulate objects and see a live update of what you're making. It's built on top of OpenCascade.js, a JS/WASM port of the open source OpenCascade 3D geometry library.

31 426

What is the output?

Anonymous voting

31 426

CHALLENGE


const handler = {
  get(target, prop, receiver) {
    if (prop in target) {
      return Reflect.get(target, prop, receiver) * 2;
    }
    return `${prop} not found`;
  },
  set(target, prop, value) {
    if (typeof value !== "number") {
      throw new TypeError("Only numbers allowed");
    }
    target[prop] = value + 10;
    return true;
  },
  has(target, prop) {
    return prop.startsWith("x") ? false : prop in target;
  },
};

const obj = new Proxy({ score: 5, xp: 100 }, handler);

obj.level = 3;
console.log(obj.score);
console.log(obj.level);
console.log("xp" in obj);
console.log("score" in obj);
console.log(obj.rank);

31 426

🌲 Node Moves to Enable Temporal By Default The Temporal API, designed to modernize JavaScript’s date/time handling, reached stage 4 last month. Node was waiting on V8 to make it enabled by default, which happened in V8 14.4, and the wheels are now in motion for an eventual release in Node 26. Richard Lau

31 426

What is the output?

Anonymous voting

31 426

CHALLENGE


const delay = (val) => Promise.resolve(val);

async function pipeline(input) {
  const result = await delay(input)
    .then((v) => v * 2)
    .then((v) => v + 10)
    .then((v) => {
      if (v > 20) throw new Error(`Too large: ${v}`);
      return v;
    })
    .catch((e) => `Caught: ${e.message}`)
    .then((v) => (typeof v === "string" ? v.toUpperCase() : v * 3));

  return result;
}

Promise.all([pipeline(4), pipeline(8)]).then(([a, b]) => {
  console.log(a);
  console.log(b);
});

31 426

What is the output?

Anonymous voting

31 426

CHALLENGE


"use strict";

function createCounter() {
  let count = 0;

  return {
    increment() { count++; },
    get value() { return count; },
    reset: function() { count = 0; }
  };
}

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

const { value, reset } = counter;
reset();

console.log(counter.value, value);

31 426

What is the output?

Anonymous voting

31 426

CHALLENGE


const config = {
  version: 1,
  settings: { theme: "dark", fontSize: 14 },
  tags: ["beta", "v1"],
};

Object.seal(config);
Object.freeze(config.settings);

config.version = 99;
config.newProp = "ignored";
delete config.tags;

config.settings.theme = "light";
config.settings.newKey = "ignored";

config.tags.push("v2");
config.tags[0] = "stable";

console.log(
  config.version,
  config.newProp,
  config.settings.theme,
  config.tags
);

31 426

What is the output?

Anonymous voting

31 426

CHALLENGE


const memoize = (fn) => {
  const cache = new Map();
  return (...args) => {
    const key = JSON.stringify(args);
    if (cache.has(key)) {
      return cache.get(key);
    }
    const result = fn(...args);
    cache.set(key, result);
    return result;
  };
};

let callCount = 0;

const expensiveMultiply = memoize((a, b) => {
  callCount++;
  return a * b;
});

console.log(expensiveMultiply(3, 4));
console.log(expensiveMultiply(3, 4));
console.log(expensiveMultiply(2, 5));
console.log(expensiveMultiply(3, 4));
console.log(`calls: ${callCount}`);

31 426

✌️ V8 Exploitation: From Libc Pwn to Browser Bugs For the past few years I've been doing pwn challenges - starting from basic stack overflows, progressing through libc heap exploitation, writing a CheatEngine clone in Rust, and prototyping an eBPF-based record-replay tool that required bypassing vDSO. I felt fairly comfortable with systems programming and userspace exploitation. But challenges like QEMU escape or browser exploitation always seemed like a different league. Something I wasn't "ready for yet." That feeling created an artificial barrier - I kept telling myself I needed more preparation before even attempting them. .... @D4RK7ET