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());👍9❤3
🤣10🤔5👍3❤2
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);👍9🔥1
🤣9🔥6❤5👍2🤔1
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.
👍10❤4🔥4🤣1
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);
❤9👍2🔥1
What is the output?
Anonymous Quiz
20%
{ names: ['Laptop', 'Headphones', 'Book', 'Shirt'], total: 1214 }
49%
{ names: ['Laptop', 'Headphones', 'Shirt'], total: 1192.5 }
16%
{ total: 1192.5, names: ['Laptop', 'Headphones', 'Shirt'] }
15%
{names: ['Laptop', 'Headphones', 'Shirt'], total: 1192.5}
🔥9🤔6👍5❤3🤣1
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());❤4
What is the output?
Anonymous Quiz
29%
Hello, I'm Alice TypeError: Cannot read property 'name' of undefined Goodbye from undefined
40%
Hello, I'm Alice Hello, I'm undefined Goodbye from undefined
21%
Hello, I'm Alice Hello, I'm Goodbye from Alice
10%
Hello, I'm Alice Hello, I'm undefined Goodbye from Alice
❤7👍3🔥1🤔1
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
24%
A G B F C E D
32%
A B G C E F D
22%
A G C E B F D
22%
A G C E B D F
👍7🤣3❤2🔥2
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);👍5❤3
❤5👍3🔥1🤔1
CHALLENGE
const date = new Date('2023-05-15T12:30:00Z'); // A specific UTC date
const formatter = new Intl.DateTimeFormat('en-US', {
year: 'numeric',
month: 'long',
day: 'numeric',
hour: '2-digit',
minute: '2-digit',
timeZone: 'America/New_York'
});
const parts = formatter.formatToParts(date);
const month = parts.find(part => part.type === 'month').value;
const day = parts.find(part => part.type === 'day').value;
const hour = parts.find(part => part.type === 'hour').value;
console.log(`${month} ${day}, at ${hour}`);❤4
What is the output?
Anonymous Quiz
18%
May 15, at 8
32%
May 15, at 08
30%
May 15, at 08 AM
20%
May 15, at 12
👍5🤔1
React continues to be a major dependency in the JavaScript world but recent innovations have led to much discussion about how it should move forward. Redux maintainer Mark Erikson gives an overview of React’s development over time, what led to some of its innovations, and dispels some ‘FUD and confusion’ about where it's headed.
Mark Erikson
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CHALLENGE
function processData(input) {
try {
if (typeof input !== 'string') {
throw new TypeError('Input must be a string');
}
if (input.length === 0) {
throw new Error('Input cannot be empty');
}
return input.toUpperCase();
} catch (error) {
if (error instanceof TypeError) {
return `Type error: ${error.message}`;
}
return `Error: ${error.message}`;
}
}
console.log(processData(''));❤9👍1