JavaScript

❓ CHALLENGE #220

const data = [1, 2, 3, 4, 5];

const result = data.flatMap(num => [num * 2, num * 3]);

console.log(result);

👀 Name Checker: Check if a Project Name is Taken An online tool that checks a bunch of different package registries (npm, GitHub, GitLab, PyPI, Maven, RubyGems, Go packages, Rust crate, etc.) to see if the name is used by another project. TODD COOKE

❓ CHALLENGE #219

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

let flattenedMatrix = [];

for (let i = 0; i < matrix.length; i++) {
  for (let j = 0; j < matrix[i].length; j++) {
    flattenedMatrix.push(matrix[i][j]);
  }
}

console.log(flattenedMatrix);

🤔 Learn How Modern JS Frameworks Work by Building One Building things is a great way to learn, even if you don’t end up using what you built. Even better is when someone who’s already built something successful introduces you to the process. Nolan doesn’t go super deep but far enough to whet your appetite and for you to learn a few things by taking it further. NOLAN LAWSON

❓ CHALLENGE #218

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

let columnSums = [];

for (let i = 0; i < matrix[0].length; i++) {
  let sum = 0;
  for (let j = 0; j < matrix.length; j++) {
    sum += matrix[j][i];
  }
  columnSums.push(sum);
}

console.log(columnSums);

🤡

❓ CHALLENGE #217

const asyncFunction = async () => {
  const delay = (ms) => new Promise(resolve => setTimeout(resolve, ms));

  const result = await Promise.race([delay(100), delay(500)]);
  return result;
};

asyncFunction().then(value => console.log(value));

👀 How Marketing Changed OOP in JavaScript A look at JavaScript’s earliest history and its prototypal nature. JUAN DIEGO RODRÍGUEZ

❓ CHALLENGE #216

function* fibonacci() {
  let [prev, curr] = [0, 1];
  while (true) {
    [prev, curr] = [curr, prev + curr];
    yield curr;
  }
}

const fib = fibonacci();

console.log(fib.next().value);
console.log(fib.next().value);
console.log(fib.next().value);

📄 Prettier's CLI: A Performance Deep Dive We’ve recently written about the bounty the Prettier project put up (and how Biome won it) but Prettier has also been working on itself by hiring the author of this post to find and implement performance improvements, all while sticking with JavaScript. FABIO SPAMPINATO

❓ CHALLENGE #215

function multiply(a, b) {
  if (b === 0) {
    return 0;
  } else if (b > 0) {
    return a + multiply(a, b - 1);
  } else {
    return -multiply(a, -b);
  }
}

console.log(multiply(7, 5));

Another Milestone Celebration 🎉 We just hit 6,000 members! 🍊 A special shoutout to my team members, Varik and Sipan—I can't thank you enough for consistently dedicating your time and effort to our project. Your commitment doesn't go unnoticed, and I speak for all of us when I say how much we value and appreciate it. Cheers to a fantastic team! 🌟 Nairi

❓ CHALLENGE #214

let x = 10;
let y = 5;

x += y -= x *= y;

console.log(x);

🗣️ Quote #10