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World Class Web Components

❓ CHALLENGE

const weakMap = new WeakMap();
const objs = [{}, {}, {}];

objs.forEach((obj, index) => weakMap.set(obj, index + 1));

const result = objs.filter(obj => weakMap.has(obj)).map(obj => weakMap.get(obj) * 2);

console.log(result);

Sponsored by Bryntum 👮‍♀️
World Class Web Components

✌️ JavaScript Weekly #​701

Sponsored by Bryntum 👮‍♀️
World Class Web Components

🌲 Node.js Security release process

Only those who have been involved in a security release process know how hard it is (time-consuming, effort).
We've been working hard to automate most (if not all) of the process and the new security release process is live

Rafael Gonzaga

Sponsored by Bryntum 👮‍♀️
World Class Web Components

❓ CHALLENGE

const obj = {
  a: 1,
  b: 2
};

let a = 10;
let b = 20;

with (obj) {
  a += 1;
  b += 1;
}

console.log(a, obj.a, b, obj.b);

Sponsored by Bryntum 👮‍♀️
World Class Web Components

❓ CHALLENGE

const obj1 = {
  name: "Alice",
  age: 25
};

const obj2 = {
  age: 30,
  city: "Wonderland"
};

with (obj1) {
  with (obj2) {
    name = "Bob";
    console.log(name, age);
  }
}

Sponsored by Bryntum 👮‍♀️
World Class Web Components

🔥 Billionaire Pavel Durov arrested... The truth about Telegram

Fireship

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World Class Web Components

✌️ Regexes Got Good: The History (and Future) of Regular Expressions in JavaScript

Regular expression support was always a little underwhelming in JS, but things have improved. Steven takes us on a tour to refresh our knowledge, as well as show off his ‘regex’ library that boosts JS regexes to a true A++ rating. Steven was co-author of O’Reilly’s Regular Expressions Cookbook and High Performance JavaScript so knows his stuff.

Steven Levithan

Sponsored by Bryntum 👮‍♀️
World Class Web Components

❓ CHALLENGE

const weakMap = new WeakMap();
const arr = [1, 2, 3].map(n => ({ n }));

arr.forEach(obj => weakMap.set(obj, obj.n * 2));

arr.pop(); // Remove the last element

const result = arr.reduce((acc, obj) => acc + weakMap.get(obj), 0);

console.log(result);

Sponsored by Bryntum 👮‍♀️
World Class Web Components

🌲 LogTape: Simple Logging Library with Zero Dependencies

I’m digging this new style of library that promises support across all the main runtimes (Node, Deno, Bun) as well as edge functions and browser devtools.

Hong Minhee

Sponsored by Bryntum 👮‍♀️
World Class Web Components

❓ CHALLENGE

function* infiniteGenerator() {
  let i = 0;
  while (true) {
    yield i++;
  }
}

const weakMap = new WeakMap();
const gen = infiniteGenerator();

weakMap.set(gen, gen.next().value);

const result = weakMap.get(gen) + gen.next().value;

console.log(result);

Sponsored by Bryntum 👮‍♀️
World Class Web Components

👸 Milkdown: Plugin-Driven WYSIWYG Markdown Editor Framework

A lightweight WYSIWYG Markdown editor based around a plugin system that enables a significant level of customization. It’s neat to see the docs are rendered by the editor itself. GitHub repo.

Mirone

Sponsored by Bryntum 👮‍♀️
World Class Web Components

❓ CHALLENGE

const weakMap = new WeakMap();
let obj = { name: 'initial' };

function changeName(obj) {
  weakMap.set(obj, obj.name);
  obj.name = 'changed';
}

changeName(obj);

console.log(weakMap.get(obj));

Sponsored by Bryntum 👮‍♀️
World Class Web Components

❓ CHALLENGE

const weakMap = new WeakMap();
const arr = [1, 2, 3, 4];
const objs = arr.map(n => ({ n }));

objs.forEach((obj, index) => weakMap.set(obj, arr.slice(0, index + 1)));

const result = objs.map(obj => weakMap.get(obj).reduce((acc, num) => acc + num, 0));

console.log(result);

Sponsored by Bryntum 👮‍♀️
World Class Web Components

❓ CHALLENGE

const weakMap = new WeakMap();
const arr = [{}, {}, {}];

arr.forEach((obj, index) => weakMap.set(obj, index));

arr.splice(1, 1); // Remove the second element

const result = arr.map(obj => weakMap.get(obj));

console.log(result);