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

India12 809 Technologies & Applications4 163...

📈 Analytical overview of Telegram channel JavaScript

Channel JavaScript (@javascript) in the English language segment is an active participant. Currently, the community unites 31 136 subscribers, ranking 4 163 in the Technologies & Applications category and 12 809 in the India region.

📊 Audience metrics and dynamics

Since its creation on невідомо, the project has demonstrated rapid growth, gathering an audience of 31 136 subscribers.

According to the latest data from 20 September, 2026, the channel demonstrates stable activity. Although there has been a change in the number of participants by -114 over the last 30 days and by -3 over the last 24 hours, overall reach remains high.

Verification status: Not verified
Engagement rate (ER): The average audience engagement rate is 6.21%. Within the first 24 hours after publication, content typically collects 2.30% reactions from the total number of subscribers.
Post reach: On average, each post receives 1 933 views. Within the first day, a publication typically gains 715 views.
Reactions and interaction: The audience actively supports content: the average number of reactions per post is 4.
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 21 September, 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.

31 136

Subscribers

-324 hours

-327 days

-11430 days

1 933

Post views

~ 71524 hours

~ 1 00448 hours

6.21%

Engagement rate

~ 2

Posts per day

Ads index

beta

Posts Archive

\"; const sanitized = userInput .replace(/alert('xss')\";\nconst sanitized = userInput\n .replace(//g, '>')\n .replace(/\"/g, '"')\n .replace(/'/g, ''');\n\nconst credentials = {\n username: 'admin',\n password: 'secret123'\n};\n\nconst safeLog = (obj) => {\n const { password, ...safe } = obj;\n return JSON.stringify(safe);\n};\n\nconsole.log(sanitized);\nconsole.log(safeLog(credentials));","datePublished":"2025-10-18T06:31:23Z","dateModified":"2025-10-18T06:31:23Z","author":{"@type":"Organization","name":"JavaScript","url":"https://telemetr.io/en/channels/1924414526-javascript","image":"https://img.tlmtr.io/c/26eE7Y/5370661389250710069?ty=x"},"publisher":{"@type":"Organization","name":"JavaScript","url":"https://telemetr.io/en/channels/1924414526-javascript","image":"https://img.tlmtr.io/c/26eE7Y/5370661389250710069?ty=x"},"commentCount":0,"interactionStatistic":[{"@type":"InteractionCounter","interactionType":"https://schema.org/ViewAction","userInteractionCount":2708},{"@type":"InteractionCounter","interactionType":"https://schema.org/ShareAction","userInteractionCount":2}]}},{"@type":"ListItem","position":6,"item":{"@type":"SocialMediaPosting","@id":"https://telemetr.io/en/channels/1924414526-javascript/posts/2722","url":"https://telemetr.io/en/channels/1924414526-javascript/posts/2722","mainEntityOfPage":"https://telemetr.io/en/channels/1924414526-javascript/posts/2722","headline":"JavaScript","datePublished":"2025-10-17T06:31:37Z","dateModified":"2025-10-17T06:31:37Z","author":{"@type":"Organization","name":"JavaScript","url":"https://telemetr.io/en/channels/1924414526-javascript","image":"https://img.tlmtr.io/c/26eE7Y/5370661389250710069?ty=x"},"publisher":{"@type":"Organization","name":"JavaScript","url":"https://telemetr.io/en/channels/1924414526-javascript","image":"https://img.tlmtr.io/c/26eE7Y/5370661389250710069?ty=x"},"commentCount":0,"interactionStatistic":[{"@type":"InteractionCounter","interactionType":"https://schema.org/ViewAction","userInteractionCount":2881},{"@type":"InteractionCounter","interactionType":"https://schema.org/LikeAction","userInteractionCount":3}]}},{"@type":"ListItem","position":7,"item":{"@type":"SocialMediaPosting","@id":"https://telemetr.io/en/channels/1924414526-javascript/posts/2721","url":"https://telemetr.io/en/channels/1924414526-javascript/posts/2721","mainEntityOfPage":"https://telemetr.io/en/channels/1924414526-javascript/posts/2721","headline":"CHALLENGE const a = 9007199254740991n; const b = BigInt(9007199254740991); const c = 9007199254740992; const…","articleBody":"CHALLENGE\n\nconst a = 9007199254740991n;\nconst b = BigInt(9007199254740991);\nconst c = 9007199254740992;\nconst d = BigInt(9007199254740992);\n\nconsole.log(a === b);\nconsole.log(Number(a) === c);\nconsole.log(c === Number.MAX_SAFE_INTEGER + 1);\nconsole.log(d > a);\nconsole.log(typeof (a + 1n));\nconsole.log(Number(d) === c);","datePublished":"2025-10-17T06:31:37Z","dateModified":"2025-10-17T06:31:37Z","author":{"@type":"Organization","name":"JavaScript","url":"https://telemetr.io/en/channels/1924414526-javascript","image":"https://img.tlmtr.io/c/26eE7Y/5370661389250710069?ty=x"},"publisher":{"@type":"Organization","name":"JavaScript","url":"https://telemetr.io/en/channels/1924414526-javascript","image":"https://img.tlmtr.io/c/26eE7Y/5370661389250710069?ty=x"},"commentCount":0,"interactionStatistic":[{"@type":"InteractionCounter","interactionType":"https://schema.org/ViewAction","userInteractionCount":2842},{"@type":"InteractionCounter","interactionType":"https://schema.org/ShareAction","userInteractionCount":2}]}},{"@type":"ListItem","position":8,"item":{"@type":"SocialMediaPosting","@id":"https://telemetr.io/en/channels/1924414526-javascript/posts/2720","url":"https://telemetr.io/en/channels/1924414526-javascript/posts/2720","mainEntityOfPage":"https://telemetr.io/en/channels/1924414526-javascript/posts/2720","headline":"👍 The Firefox team has put together a way for you to give input on which Interop proposals matter the most to…","articleBody":"👍 The Firefox team has put together a way for you to give input on which Interop proposals matter the most to you (above). Go to the Interop Feature Ranking site (GitHub account required) and drag the web platform features that matter most for you to the top.","datePublished":"2025-10-16T13:05:15Z","dateModified":"2025-10-16T13:05:15Z","author":{"@type":"Organization","name":"JavaScript","url":"https://telemetr.io/en/channels/1924414526-javascript","image":"https://img.tlmtr.io/c/26eE7Y/5370661389250710069?ty=x"},"publisher":{"@type":"Organization","name":"JavaScript","url":"https://telemetr.io/en/channels/1924414526-javascript","image":"https://img.tlmtr.io/c/26eE7Y/5370661389250710069?ty=x"},"commentCount":0,"interactionStatistic":[{"@type":"InteractionCounter","interactionType":"https://schema.org/ViewAction","userInteractionCount":3191},{"@type":"InteractionCounter","interactionType":"https://schema.org/LikeAction","userInteractionCount":4},{"@type":"InteractionCounter","interactionType":"https://schema.org/ShareAction","userInteractionCount":3}]}},{"@type":"ListItem","position":9,"item":{"@type":"SocialMediaPosting","@id":"https://telemetr.io/en/channels/1924414526-javascript/posts/2719","url":"https://telemetr.io/en/channels/1924414526-javascript/posts/2719","mainEntityOfPage":"https://telemetr.io/en/channels/1924414526-javascript/posts/2719","headline":"JavaScript","datePublished":"2025-10-16T06:30:37Z","dateModified":"2025-10-16T06:30:37Z","author":{"@type":"Organization","name":"JavaScript","url":"https://telemetr.io/en/channels/1924414526-javascript","image":"https://img.tlmtr.io/c/26eE7Y/5370661389250710069?ty=x"},"publisher":{"@type":"Organization","name":"JavaScript","url":"https://telemetr.io/en/channels/1924414526-javascript","image":"https://img.tlmtr.io/c/26eE7Y/5370661389250710069?ty=x"},"commentCount":0,"interactionStatistic":[{"@type":"InteractionCounter","interactionType":"https://schema.org/ViewAction","userInteractionCount":3166},{"@type":"InteractionCounter","interactionType":"https://schema.org/LikeAction","userInteractionCount":6}]}},{"@type":"ListItem","position":10,"item":{"@type":"SocialMediaPosting","@id":"https://telemetr.io/en/channels/1924414526-javascript/posts/2718","url":"https://telemetr.io/en/channels/1924414526-javascript/posts/2718","mainEntityOfPage":"https://telemetr.io/en/channels/1924414526-javascript/posts/2718","headline":"CHALLENGE class Observable { constructor(subscriber) { this.subscriber = subscriber; } subscribe(observer) {…","articleBody":"CHALLENGE\n\nclass Observable {\n constructor(subscriber) {\n this.subscriber = subscriber;\n }\n \n subscribe(observer) {\n return this.subscriber(observer);\n }\n \n map(fn) {\n return new Observable(observer => {\n return this.subscribe({\n next: value => observer.next(fn(value)),\n error: err => observer.error(err),\n complete: () => observer.complete()\n });\n });\n }\n}\n\nconst source = new Observable(observer => {\n observer.next(1);\n observer.next(2);\n observer.complete();\n});\n\nconst doubled = source.map(x => x * 2);\ndoubled.subscribe({\n next: value => console.log(value),\n complete: () => console.log('done')\n});","datePublished":"2025-10-16T06:30:37Z","dateModified":"2025-10-16T06:30:37Z","author":{"@type":"Organization","name":"JavaScript","url":"https://telemetr.io/en/channels/1924414526-javascript","image":"https://img.tlmtr.io/c/26eE7Y/5370661389250710069?ty=x"},"publisher":{"@type":"Organization","name":"JavaScript","url":"https://telemetr.io/en/channels/1924414526-javascript","image":"https://img.tlmtr.io/c/26eE7Y/5370661389250710069?ty=x"},"commentCount":0,"interactionStatistic":[{"@type":"InteractionCounter","interactionType":"https://schema.org/ViewAction","userInteractionCount":2867},{"@type":"InteractionCounter","interactionType":"https://schema.org/LikeAction","userInteractionCount":2}]}},{"@type":"ListItem","position":11,"item":{"@type":"SocialMediaPosting","@id":"https://telemetr.io/en/channels/1924414526-javascript/posts/2717","url":"https://telemetr.io/en/channels/1924414526-javascript/posts/2717","mainEntityOfPage":"https://telemetr.io/en/channels/1924414526-javascript/posts/2717","headline":"👀 Viz.js 3.20: Work with Graphviz in the Browser Graphviz is a suite of open source graph drawing tools of ov…","articleBody":"👀 Viz.js 3.20: Work with Graphviz in the Browser\n\nGraphviz is a suite of open source graph drawing tools of over 30 years’ vintage. Viz.js is a WebAssembly Graphviz build that brings its functionality into the browser. GitHub repo.\n\nMichael Daines","datePublished":"2025-10-15T13:05:22Z","dateModified":"2025-10-15T13:05:22Z","author":{"@type":"Organization","name":"JavaScript","url":"https://telemetr.io/en/channels/1924414526-javascript","image":"https://img.tlmtr.io/c/26eE7Y/5370661389250710069?ty=x"},"publisher":{"@type":"Organization","name":"JavaScript","url":"https://telemetr.io/en/channels/1924414526-javascript","image":"https://img.tlmtr.io/c/26eE7Y/5370661389250710069?ty=x"},"commentCount":0,"interactionStatistic":[{"@type":"InteractionCounter","interactionType":"https://schema.org/ViewAction","userInteractionCount":2728},{"@type":"InteractionCounter","interactionType":"https://schema.org/LikeAction","userInteractionCount":9},{"@type":"InteractionCounter","interactionType":"https://schema.org/ShareAction","userInteractionCount":4}]}},{"@type":"ListItem","position":12,"item":{"@type":"SocialMediaPosting","@id":"https://telemetr.io/en/channels/1924414526-javascript/posts/2716","url":"https://telemetr.io/en/channels/1924414526-javascript/posts/2716","mainEntityOfPage":"https://telemetr.io/en/channels/1924414526-javascript/posts/2716","headline":"JavaScript","datePublished":"2025-10-15T06:32:57Z","dateModified":"2025-10-15T06:32:57Z","author":{"@type":"Organization","name":"JavaScript","url":"https://telemetr.io/en/channels/1924414526-javascript","image":"https://img.tlmtr.io/c/26eE7Y/5370661389250710069?ty=x"},"publisher":{"@type":"Organization","name":"JavaScript","url":"https://telemetr.io/en/channels/1924414526-javascript","image":"https://img.tlmtr.io/c/26eE7Y/5370661389250710069?ty=x"},"commentCount":0,"interactionStatistic":[{"@type":"InteractionCounter","interactionType":"https://schema.org/ViewAction","userInteractionCount":2924},{"@type":"InteractionCounter","interactionType":"https://schema.org/LikeAction","userInteractionCount":11}]}},{"@type":"ListItem","position":13,"item":{"@type":"SocialMediaPosting","@id":"https://telemetr.io/en/channels/1924414526-javascript/posts/2715","url":"https://telemetr.io/en/channels/1924414526-javascript/posts/2715","mainEntityOfPage":"https://telemetr.io/en/channels/1924414526-javascript/posts/2715","headline":"CHALLENGE class Calculator { static multiply(a, b) { return a * b; } static add = (a, b) => { return a + b; }…","articleBody":"CHALLENGE\n\nclass Calculator {\n static multiply(a, b) {\n return a * b;\n }\n \n static add = (a, b) => {\n return a + b;\n }\n}\n\nclass ScientificCalculator extends Calculator {\n static multiply(a, b) {\n return super.multiply(a, b) * 2;\n }\n}\n\nconsole.log(Calculator.multiply(3, 4));\nconsole.log(ScientificCalculator.add(5, 6));\nconsole.log(ScientificCalculator.multiply(2, 3));","datePublished":"2025-10-15T06:32:57Z","dateModified":"2025-10-15T06:32:57Z","author":{"@type":"Organization","name":"JavaScript","url":"https://telemetr.io/en/channels/1924414526-javascript","image":"https://img.tlmtr.io/c/26eE7Y/5370661389250710069?ty=x"},"publisher":{"@type":"Organization","name":"JavaScript","url":"https://telemetr.io/en/channels/1924414526-javascript","image":"https://img.tlmtr.io/c/26eE7Y/5370661389250710069?ty=x"},"commentCount":0,"interactionStatistic":[{"@type":"InteractionCounter","interactionType":"https://schema.org/ViewAction","userInteractionCount":2895},{"@type":"InteractionCounter","interactionType":"https://schema.org/LikeAction","userInteractionCount":4},{"@type":"InteractionCounter","interactionType":"https://schema.org/ShareAction","userInteractionCount":1}]}},{"@type":"ListItem","position":14,"item":{"@type":"SocialMediaPosting","@id":"https://telemetr.io/en/channels/1924414526-javascript/posts/2714","url":"https://telemetr.io/en/channels/1924414526-javascript/posts/2714","mainEntityOfPage":"https://telemetr.io/en/channels/1924414526-javascript/posts/2714","headline":"📥 The Birth of Prettier The author takes us back ten years to the genesis of Prettier, the popular opinionate…","articleBody":"📥 The Birth of Prettier\n\nThe author takes us back ten years to the genesis of Prettier, the popular opinionated, deterministic code formatter he co-created with James Long. Prettier effectively introduced and popularized the practice of fully-automated AST-based code formatting in the JavaScript ecosystem.\n\nChristopher Chedeau (Vjeux)","datePublished":"2025-10-14T13:02:55Z","dateModified":"2025-10-14T13:02:55Z","author":{"@type":"Organization","name":"JavaScript","url":"https://telemetr.io/en/channels/1924414526-javascript","image":"https://img.tlmtr.io/c/26eE7Y/5370661389250710069?ty=x"},"publisher":{"@type":"Organization","name":"JavaScript","url":"https://telemetr.io/en/channels/1924414526-javascript","image":"https://img.tlmtr.io/c/26eE7Y/5370661389250710069?ty=x"},"commentCount":0,"interactionStatistic":[{"@type":"InteractionCounter","interactionType":"https://schema.org/ViewAction","userInteractionCount":2606},{"@type":"InteractionCounter","interactionType":"https://schema.org/LikeAction","userInteractionCount":14},{"@type":"InteractionCounter","interactionType":"https://schema.org/ShareAction","userInteractionCount":5}]}},{"@type":"ListItem","position":15,"item":{"@type":"SocialMediaPosting","@id":"https://telemetr.io/en/channels/1924414526-javascript/posts/2713","url":"https://telemetr.io/en/channels/1924414526-javascript/posts/2713","mainEntityOfPage":"https://telemetr.io/en/channels/1924414526-javascript/posts/2713","headline":"JavaScript","datePublished":"2025-10-14T06:31:40Z","dateModified":"2025-10-14T06:31:40Z","author":{"@type":"Organization","name":"JavaScript","url":"https://telemetr.io/en/channels/1924414526-javascript","image":"https://img.tlmtr.io/c/26eE7Y/5370661389250710069?ty=x"},"publisher":{"@type":"Organization","name":"JavaScript","url":"https://telemetr.io/en/channels/1924414526-javascript","image":"https://img.tlmtr.io/c/26eE7Y/5370661389250710069?ty=x"},"commentCount":0,"interactionStatistic":[{"@type":"InteractionCounter","interactionType":"https://schema.org/ViewAction","userInteractionCount":2833},{"@type":"InteractionCounter","interactionType":"https://schema.org/LikeAction","userInteractionCount":9}]}},{"@type":"ListItem","position":16,"item":{"@type":"SocialMediaPosting","@id":"https://telemetr.io/en/channels/1924414526-javascript/posts/2712","url":"https://telemetr.io/en/channels/1924414526-javascript/posts/2712","mainEntityOfPage":"https://telemetr.io/en/channels/1924414526-javascript/posts/2712","headline":"CHALLENGE const obj = { name: 'Sarah', greet() { return `Hello, ${this.name}`; }, delayedGreet() { const fn =…","articleBody":"CHALLENGE\n\nconst obj = {\n name: 'Sarah',\n greet() {\n return `Hello, ${this.name}`;\n },\n delayedGreet() {\n const fn = function() {\n return this.greet();\n };\n return fn.call(this);\n }\n};\n\nconst result = obj.delayedGreet();\nconsole.log(result);","datePublished":"2025-10-14T06:31:40Z","dateModified":"2025-10-14T06:31:40Z","author":{"@type":"Organization","name":"JavaScript","url":"https://telemetr.io/en/channels/1924414526-javascript","image":"https://img.tlmtr.io/c/26eE7Y/5370661389250710069?ty=x"},"publisher":{"@type":"Organization","name":"JavaScript","url":"https://telemetr.io/en/channels/1924414526-javascript","image":"https://img.tlmtr.io/c/26eE7Y/5370661389250710069?ty=x"},"commentCount":0,"interactionStatistic":[{"@type":"InteractionCounter","interactionType":"https://schema.org/ViewAction","userInteractionCount":2781},{"@type":"InteractionCounter","interactionType":"https://schema.org/LikeAction","userInteractionCount":3},{"@type":"InteractionCounter","interactionType":"https://schema.org/ShareAction","userInteractionCount":4}]}},{"@type":"ListItem","position":17,"item":{"@type":"SocialMediaPosting","@id":"https://telemetr.io/en/channels/1924414526-javascript/posts/2711","url":"https://telemetr.io/en/channels/1924414526-javascript/posts/2711","mainEntityOfPage":"https://telemetr.io/en/channels/1924414526-javascript/posts/2711","headline":"💌 Vite: The Documentary From the same creators of the fantastic 😉 Node.js, 😉 Angular and 😉 React documentarie…","articleBody":"💌 Vite: The Documentary\n\nFrom the same creators of the fantastic 😉 Node.js, 😉 Angular and 😉 React documentaries comes an up to date look at Vite, the build tool that has taken the JavaScript ecosystem by storm in recent years. Many luminaries make an appearance to tell their stories, including Evan You, Rich Harris, and Ryan Carniato. (39 minutes.)\n\nCultRepo","datePublished":"2025-10-13T12:04:14Z","dateModified":"2025-10-13T12:04:14Z","author":{"@type":"Organization","name":"JavaScript","url":"https://telemetr.io/en/channels/1924414526-javascript","image":"https://img.tlmtr.io/c/26eE7Y/5370661389250710069?ty=x"},"publisher":{"@type":"Organization","name":"JavaScript","url":"https://telemetr.io/en/channels/1924414526-javascript","image":"https://img.tlmtr.io/c/26eE7Y/5370661389250710069?ty=x"},"commentCount":0,"interactionStatistic":[{"@type":"InteractionCounter","interactionType":"https://schema.org/ViewAction","userInteractionCount":2991},{"@type":"InteractionCounter","interactionType":"https://schema.org/LikeAction","userInteractionCount":8},{"@type":"InteractionCounter","interactionType":"https://schema.org/ShareAction","userInteractionCount":10}]}},{"@type":"ListItem","position":18,"item":{"@type":"SocialMediaPosting","@id":"https://telemetr.io/en/channels/1924414526-javascript/posts/2710","url":"https://telemetr.io/en/channels/1924414526-javascript/posts/2710","mainEntityOfPage":"https://telemetr.io/en/channels/1924414526-javascript/posts/2710","headline":"JavaScript","datePublished":"2025-10-13T06:31:21Z","dateModified":"2025-10-13T14:31:07Z","author":{"@type":"Organization","name":"JavaScript","url":"https://telemetr.io/en/channels/1924414526-javascript","image":"https://img.tlmtr.io/c/26eE7Y/5370661389250710069?ty=x"},"publisher":{"@type":"Organization","name":"JavaScript","url":"https://telemetr.io/en/channels/1924414526-javascript","image":"https://img.tlmtr.io/c/26eE7Y/5370661389250710069?ty=x"},"commentCount":0,"interactionStatistic":[{"@type":"InteractionCounter","interactionType":"https://schema.org/ViewAction","userInteractionCount":831},{"@type":"InteractionCounter","interactionType":"https://schema.org/LikeAction","userInteractionCount":3},{"@type":"InteractionCounter","interactionType":"https://schema.org/ShareAction","userInteractionCount":1}]}},{"@type":"ListItem","position":19,"item":{"@type":"SocialMediaPosting","@id":"https://telemetr.io/en/channels/1924414526-javascript/posts/2709","url":"https://telemetr.io/en/channels/1924414526-javascript/posts/2709","mainEntityOfPage":"https://telemetr.io/en/channels/1924414526-javascript/posts/2709","headline":"CHALLENGE const obj = { valueOf: () => 42, toString: () => '24' }; const results = [ obj + '', +obj, obj == 4…","articleBody":"CHALLENGE\n\nconst obj = {\n valueOf: () => 42,\n toString: () => '24'\n};\n\nconst results = [\n obj + '',\n +obj,\n obj == 42,\n obj === 42,\n String(obj),\n Number(obj)\n];\n\nconsole.log(results);","datePublished":"2025-10-13T06:31:21Z","dateModified":"2025-10-13T14:27:27Z","author":{"@type":"Organization","name":"JavaScript","url":"https://telemetr.io/en/channels/1924414526-javascript","image":"https://img.tlmtr.io/c/26eE7Y/5370661389250710069?ty=x"},"publisher":{"@type":"Organization","name":"JavaScript","url":"https://telemetr.io/en/channels/1924414526-javascript","image":"https://img.tlmtr.io/c/26eE7Y/5370661389250710069?ty=x"},"commentCount":0,"interactionStatistic":[{"@type":"InteractionCounter","interactionType":"https://schema.org/ViewAction","userInteractionCount":812},{"@type":"InteractionCounter","interactionType":"https://schema.org/LikeAction","userInteractionCount":1},{"@type":"InteractionCounter","interactionType":"https://schema.org/ShareAction","userInteractionCount":2}]}},{"@type":"ListItem","position":20,"item":{"@type":"SocialMediaPosting","@id":"https://telemetr.io/en/channels/1924414526-javascript/posts/2708","url":"https://telemetr.io/en/channels/1924414526-javascript/posts/2708","mainEntityOfPage":"https://telemetr.io/en/channels/1924414526-javascript/posts/2708","headline":"JavaScript","datePublished":"2025-10-12T06:34:36Z","dateModified":"2025-10-12T06:34:36Z","author":{"@type":"Organization","name":"JavaScript","url":"https://telemetr.io/en/channels/1924414526-javascript","image":"https://img.tlmtr.io/c/26eE7Y/5370661389250710069?ty=x"},"publisher":{"@type":"Organization","name":"JavaScript","url":"https://telemetr.io/en/channels/1924414526-javascript","image":"https://img.tlmtr.io/c/26eE7Y/5370661389250710069?ty=x"},"commentCount":0,"interactionStatistic":[{"@type":"InteractionCounter","interactionType":"https://schema.org/ViewAction","userInteractionCount":2997},{"@type":"InteractionCounter","interactionType":"https://schema.org/LikeAction","userInteractionCount":8}]}}]}

31 138

CHALLENGE

const data = '{"name": "Maria", "age": 25, "skills": ["JavaScript", "Python"]}';

try {
  const parsed = JSON.parse(data);
  const modified = {
    ...parsed,
    age: parsed.age + 5,
    skills: [...parsed.skills, "TypeScript"]
  };
  
  const serialized = JSON.stringify(modified, null, 0);
  const reparsed = JSON.parse(serialized);
  
  console.log(reparsed.skills.length);
  console.log(typeof reparsed.age);
} catch (error) {
  console.log('Parse error');
}

31 138

What is the output?

Anonymous voting

31 138

CHALLENGE

const wm = new WeakMap();
const obj1 = {};
const obj2 = {};
const obj3 = obj1;

wm.set(obj1, 'first');
wm.set(obj2, 'second');
wm.set(obj3, 'third');

console.log(wm.get(obj1));
console.log(wm.get(obj2));
console.log(wm.get(obj3));
console.log(wm.has(obj1));
console.log(wm.size);

31 138

What is the output?

Anonymous voting

31 138

CHALLENGE

const userInput = "<script>alert('xss')</script>";
const sanitized = userInput
  .replace(/</g, '&lt;')
  .replace(/>/g, '&gt;')
  .replace(/"/g, '&quot;')
  .replace(/'/g, '&#x27;');

const credentials = {
  username: 'admin',
  password: 'secret123'
};

const safeLog = (obj) => {
  const { password, ...safe } = obj;
  return JSON.stringify(safe);
};

console.log(sanitized);
console.log(safeLog(credentials));

31 138

What is the output?

Anonymous voting

31 138

CHALLENGE

const a = 9007199254740991n;
const b = BigInt(9007199254740991);
const c = 9007199254740992;
const d = BigInt(9007199254740992);

console.log(a === b);
console.log(Number(a) === c);
console.log(c === Number.MAX_SAFE_INTEGER + 1);
console.log(d > a);
console.log(typeof (a + 1n));
console.log(Number(d) === c);

31 138

👍 The Firefox team has put together a way for you to give input on which Interop proposals matter the most to you (above). Go to the Interop Feature Ranking site (GitHub account required) and drag the web platform features that matter most for you to the top.

31 138

What is the output?

Anonymous voting

31 138

CHALLENGE

class Observable {
  constructor(subscriber) {
    this.subscriber = subscriber;
  }
  
  subscribe(observer) {
    return this.subscriber(observer);
  }
  
  map(fn) {
    return new Observable(observer => {
      return this.subscribe({
        next: value => observer.next(fn(value)),
        error: err => observer.error(err),
        complete: () => observer.complete()
      });
    });
  }
}

const source = new Observable(observer => {
  observer.next(1);
  observer.next(2);
  observer.complete();
});

const doubled = source.map(x => x * 2);
doubled.subscribe({
  next: value => console.log(value),
  complete: () => console.log('done')
});

31 138

👀 Viz.js 3.20: Work with Graphviz in the Browser Graphviz is a suite of open source graph drawing tools of over 30 years’ vintage. Viz.js is a WebAssembly Graphviz build that brings its functionality into the browser. GitHub repo. Michael Daines

31 138

What is the output?

Anonymous voting

31 138

CHALLENGE

class Calculator {
  static multiply(a, b) {
    return a * b;
  }
  
  static add = (a, b) => {
    return a + b;
  }
}

class ScientificCalculator extends Calculator {
  static multiply(a, b) {
    return super.multiply(a, b) * 2;
  }
}

console.log(Calculator.multiply(3, 4));
console.log(ScientificCalculator.add(5, 6));
console.log(ScientificCalculator.multiply(2, 3));

31 138

📥 The Birth of Prettier The author takes us back ten years to the genesis of Prettier, the popular opinionated, deterministic code formatter he co-created with James Long. Prettier effectively introduced and popularized the practice of fully-automated AST-based code formatting in the JavaScript ecosystem. Christopher Chedeau (Vjeux)

31 138

What is the output?

Anonymous voting

31 138

CHALLENGE

const obj = {
  name: 'Sarah',
  greet() {
    return `Hello, ${this.name}`;
  },
  delayedGreet() {
    const fn = function() {
      return this.greet();
    };
    return fn.call(this);
  }
};

const result = obj.delayedGreet();
console.log(result);

31 138

💌 Vite: The Documentary From the same creators of the fantastic 😉 Node.js, 😉 Angular and 😉 React documentaries comes an up to date look at Vite, the build tool that has taken the JavaScript ecosystem by storm in recent years. Many luminaries make an appearance to tell their stories, including Evan You, Rich Harris, and Ryan Carniato. (39 minutes.) CultRepo

31 138

What is the output?

Anonymous voting

31 138

CHALLENGE

const obj = {
  valueOf: () => 42,
  toString: () => '24'
};

const results = [
  obj + '',
  +obj,
  obj == 42,
  obj === 42,
  String(obj),
  Number(obj)
];

console.log(results);

31 138

What is the output?

Anonymous voting