If you’ve ever been overwhelmed by what’s in node_modules, this tool lets you dig around with some guidance as to what is what. You can use fuzzy search to find specific things as well as see which modules are using the most space (you can try it right now with `npx qnm doctor`).
Ran Yitzhaki
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CHALLENGE
const numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
const result = numbers
.filter(num => num % 2 === 0)
.map(num => num * 2)
.reduce((acc, num, index, array) => {
if (index === array.length - 1) {
return (acc + num) / array.length;
}
return acc + num;
}, 0);
console.log(result);
Why let Python developers have all the fun? Now you can harness the full power of Google’s Gemini API (and Vertex platform) from Node too. v1.0 landed a few days ago, but today we also get v1.1 which includes CommonJS support. The Gemini docs and examples now use it too (if you select JavaScript).
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CHALLENGE
const user = {
details: {
name: 'Alex',
contact: null,
preferences: {
theme: 'dark'
}
},
getInfo() {
return this?.details?.contact?.email ||
this?.details?.preferences?.theme ||
this?.details?.name ||
'Unknown';
}
};
console.log(user.getInfo());A monorepo is like a BMW: it requires constant maintenance and attention. You can’t just set it up once and expect it to work smoothly for the next five years.
nairihar
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CHALLENGE
function createCounter() {
let count = 0;
return {
increment: () => ++count,
getCount: () => count
};
}
function compose(...fns) {
return (x) => fns.reduceRight((acc, fn) => fn(acc), x);
}
const counter = createCounter();
const double = x => x * 2;
const addOne = x => x + 1;
const incrementAndProcess = compose(double, addOne, counter.increment);
counter.increment();
const result = incrementAndProcess();
console.log(result);TypeScript 5.5 introduces support for new ECMAScript methods on the Set object: union, intersection, difference, and symmetricDifference. These methods allow for more intuitive and readable operations on sets.
CHALLENGE
const products = [
{ id: 1, name: 'Laptop', price: 1200, category: 'Electronics' },
{ id: 2, name: 'Headphones', price: 100, category: 'Electronics' },
{ id: 3, name: 'Book', price: 15, category: 'Books' },
{ id: 4, name: 'Shirt', price: 25, category: 'Clothing' },
{ id: 5, name: 'Coffee Mug', price: 10, category: 'Kitchen' }
];
const result = products
.filter(p => p.price > 20)
.map(p => ({ name: p.name, value: p.price * 0.9 }))
.reduce((acc, item) => {
acc.names.push(item.name);
acc.total += item.value;
return acc;
}, { names: [], total: 0 });
console.log(result);
CHALLENGE
const person = {
name: 'Alice',
greet() {
return `Hello, I'm ${this.name}`;
},
farewell: () => `Goodbye from ${this.name}`
};
const greetFn = person.greet;
const farewellFn = person.farewell;
console.log(person.greet());
console.log(greetFn());
console.log(farewellFn());What is the output?
Anonymous Quiz
29%
Hello, I'm Alice TypeError: Cannot read property 'name' of undefined Goodbye from undefined
41%
Hello, I'm Alice Hello, I'm undefined Goodbye from undefined
22%
Hello, I'm Alice Hello, I'm Goodbye from Alice
8%
Hello, I'm Alice Hello, I'm undefined Goodbye from Alice
Matteo Collina notes the Node.js ecosystem is “at a critical juncture”, with v18 and earlier now ‘End-of-Life’. He breaks down what that really means for users of legacy versions, and why you should skip Active LTS v20 and leap straight to v22 for maximum future-proofing. If you have to stay on older versions, though, Matteo shares an option to consider.
Matteo Collina
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CHALLENGE
function task1() {
console.log('A');
setTimeout(() => console.log('B'), 0);
Promise.resolve().then(() => console.log('C'));
Promise.resolve().then(() => setTimeout(() => console.log('D'), 0));
Promise.resolve().then(() => console.log('E'));
setTimeout(() => console.log('F'), 0);
console.log('G');
}
task1();
// What is the order of the console output?What is the output?
Anonymous Quiz
23%
A G B F C E D
32%
A B G C E F D
23%
A G C E B F D
22%
A G C E B D F
CHALLENGE
function* fibonacci() {
let [a, b] = [0, 1];
while (true) {
yield a;
[a, b] = [b, a + b];
}
}
const fib = fibonacci();
const result = [];
for (let i = 0; i < 4; i++) {
result.push(fib.next().value);
}
const sum = result.reduce((total, num) => total + num, 0);
console.log(sum);