JavaScript

CHALLENGE

const weakMap = new WeakMap();
const obj = {};

(function() {
  const obj1 = { name: 'inner' };
  weakMap.set(obj1, 'inner value');
})();

const result = weakMap.get(obj);

console.log(result);

🌲 🧵 worker_map: Tread-safe map structure for worker_threads A simple abstraction for Node.js worker_threads, allowing you to create and share a Map (hash table) between worker threads and the main process.

CHALLENGE

function* idGenerator() {
  let id = 1;
  while (true) {
    yield id++;
  }
}

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

objs.forEach(obj => weakMap.set(obj, gen.next().value));

const result = objs.map(obj => weakMap.get(obj)).filter(id => id % 2 === 0);

console.log(result);

🔥 We're on the brink of another world browser war Fireship

CHALLENGE

const weakMap = new WeakMap();
const obj1 = {};
const obj2 = {};

weakMap.set(obj1, 'value1');
weakMap.set(obj2, 'value2');

const arr = [obj1, obj2];
const result = arr.map(obj => weakMap.get(obj)).join(', ');

console.log(result);

🤟 Node.js Toolbox: A Way to Find and Compare Node.js Packages A fantastic community maintained resource that presents a category-based way to find packages and libraries. For example, you can check out HTTP frameworks, browser testing, query builders, and more. You can compare libraries in various ways, see their download count, or edit/submit listings yourself. Maxim Orlov

CHALLENGE

function* reverseGenerator(arr) {
  for (let i = arr.length - 1; i >= 0; i--) {
    yield arr[i];
  }
}

const result = [...reverseGenerator([1, 2, 3, 4, 5])].join('');

console.log(result);

🌲 Neon: Rust Bindings for Writing Node.js Modules Or, as they put it: “Electrify Node.js with the power of Rust.” Neon makes it relatively easy to write code in the popular, high speed systems language and run it from Node, much like any other native extension. Neon Contributors

CHALLENGE

function* alternatingGenerator() {
  yield 1;
  yield 2;
  yield 3;
}

const gen = alternatingGenerator();
const result = [gen.next().value, gen.next().value, gen.next().value].reduce((acc, curr) => acc + curr, 0);

console.log(result);

SPONSORED BY Lantern Cloud 👯‍♀️ Vector database on top of Postgres for AI 🤔 JS-PyTorch: A PyTorch-Like Library for JavaScript Recently renamed from JS-Torch, this brings some of the magic from Python’s popular PyTorch library to JavaScript for training and testing neural networks in particular. We linked to it earlier this year, but it has added GPU support thanks to GPU.js. Eduardo Leao

SPONSORED BY Lantern Cloud 👯‍♀️ Vector database on top of Postgres for AI ❓ CHALLENGE

function* fibGenerator() {
  let a = 0, b = 1;
  while (true) {
    let next = a + b;
    a = b;
    b = next;
    yield next;
  }
}

const gen = fibGenerator();
const fibArray = Array.from({ length: 5 }, () => gen.next().value);

console.log(fibArray);

SPONSORED BY Lantern Cloud 👯‍♀️ Vector database on top of Postgres for AI 💻 What we got wrong about HTTP imports Ryan Dahl

SPONSORED BY Lantern Cloud 👯‍♀️ Vector database on top of Postgres for AI ❓ CHALLENGE

function* idGenerator() {
  let id = 1;
  while (true) {
    yield id++;
  }
}

const gen = idGenerator();
const ids = Array.from({ length: 3 }, () => gen.next().value).map(id => `ID${id}`);

console.log(ids);

SPONSORED BY Lantern Cloud 👯‍♀️ Vector database on top of Postgres for AI 🆒 Projects on roadmap.sh Projects are a fantastic way to validate your learning and solidify your knowledge. We're thrilled to introduce projects across all of our 50+ roadmaps! We're starting with the backend roadmap, which now features 18 project ideas of varying difficulty levels. We'll gradually add projects to all our roadmaps making our roadmaps even more powerful. Kamran Ahmed