❓ CHALLENGE

const array = [
  { name: 'Alice', age: 25 },
  { name: 'Bob', age: 30 },
  { name: 'Charlie', age: 22 },
];

const result = array.find(obj => obj.age === 30);

console.log(result);

🤩 Heat.js: A Heat Map Visualization Library

It has no dependencies, and is small, responsive, and themeable. GitHub repo.

WILLIAM TROUP

❓ CHALLENGE

function asyncSum(arr) {
  return arr.reduce(async (acc, num) => (await acc) + num, Promise.resolve(0));
}

async function computeTotal() {
  const result = await asyncSum([1, 2, 3, 4, 5]);
  console.log(result);
}

computeTotal();

👀 Alpine, HTMX, Astro Stack Wordle App With Full Source!

Popular dev YouTuber Jack demonstrates building a Wordle clone with a modern Alpine, HTMX and Astro-based stack. Or you can go straight to the code, if you prefer.

JACK HERRINGTON

❓ CHALLENGE

const matrix = [
  [1, 2, 3],
  [4, 5, 6],
  [7, 8, 9],
];

async function complexMatrixOperation(matrix) {
  const result = await Promise.all(matrix.map(async row => {
    return await Promise.all(row.map(async num => {
      if (num % 2 === 0) {
        return await new Promise(resolve => setTimeout(() => resolve(num * 3), 200));
      } else {
        return await new Promise(resolve => setTimeout(() => resolve(num * 2), 100));
      }
    }));
  }));

  console.log(result);
}

complexMatrixOperation(matrix);

☄️✌️ QuickJS: The Small, Embeddable JavaScript Engine

Several years ago, Fabrice Bellard, the genius behind FFMPEG and JSLinux, built a tiny and complete JavaScript engine in C. It now supports ES2023 and its latest release adds top-level await in modules and its REPL, as well as support for some cutting edge JS features (changelog).

FABRICE BELLARD

❓ CHALLENGE

async function asyncQuiz() {
  console.log("Start");

  const promise1 = new Promise((resolve) => {
    setTimeout(() => resolve("Promise 1"), 1000);
  });

  const promise2 = new Promise((resolve) => {
    setTimeout(() => resolve("Promise 2"), 500);
  });

  console.log(await promise1);
  console.log(await promise2);

  console.log("End");
}

asyncQuiz();

✌️🍊 Jint 3.0: A JavaScript Interpreter for .NET

Run JavaScript within a .NET app and expose .NET objects and functions to JavaScript code. v3 arrives after seven years of work and is the most standards-compliant JS engine running entirely within .NET.

SÉBASTIEN ROS

❓ CHALLENGE

const fetchData = async (id) => {
  return new Promise((resolve) => {
    setTimeout(() => resolve(`Data for ID ${id}`), 100);
  });
};

const ids = [1, 2, 3];

async function complexAsyncFetch(ids) {
  const result = await ids.reduce(async (acc, id) => {
    const data = await fetchData(id);
    const currentResult = await acc;
    currentResult.push(data);
    return currentResult;
  }, Promise.resolve([]));

  console.log(result);
}

complexAsyncFetch(ids);

😂 Nice life hack

❓ CHALLENGE

function recursiveFibonacci(n) {
  return n <= 1 ? n : recursiveFibonacci(n - 1) + recursiveFibonacci(n - 2);
}

const result = recursiveFibonacci(6);

console.log(result);