What is the output?
Anonymous Quiz
23%
Script Start, First Start, Second Start, Script End, First End, Timeout
19%
First Start, Script Start, Second Start, Script End, First End, Timeout
39%
Script Start, First Start, Second Start, First End, Script End, Timeout
19%
Script Start, First Start, First End, Second Start, Script End, Timeout
1π€20π€£4π1
The code to lay out documents is verbose but thereβs a lot of functionality baked in and there arenβt many other options for this task. Hereβs a CodePen-based example to give you an idea. GitHub repo.
Dolan Miu
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π3β€2π₯2
CHALLENGE β
const obj = Object.freeze({
name: "Alice",
info: {
age: 25
}
});
try {
obj.name = "Bob";
obj.info.age = 30;
} catch (e) {
console.log("Error:", e.message);
}
console.log(obj.name, obj.info.age);
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π3
What is the output?
Anonymous Quiz
33%
Error: Cannot assign to read-only property 'name' -> Alice 25
23%
Error: Cannot assign to read-only property 'name' -> Bob 30
26%
Alice 30
17%
Bob 30
π€15π7β€3π€©2
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π6π₯3β€1
CHALLENGE β
function* numberGenerator() {
let i = 0;
while (i < 3) {
yield i++;
}
}
const gen = numberGenerator();
console.log(gen.next().value);
console.log(gen.return(10).value);
console.log(gen.next().value);
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π€©4π2π₯1
π€10π5β€2
CHALLENGE β
function processData({ a = 10, b = 20 } = { a: 30 }) {
console.log(a, b);
}
processData({ a: 5 });
processData();
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π1
π€13π7π₯2π€£1
CHALLENGE β
const obj = {};
Object.defineProperty(obj, 'name', {
value: 'Alice',
writable: false,
configurable: false
});
try {
obj.name = 'Bob';
delete obj.name;
console.log(obj.name);
} catch (e) {
console.log('Error:', e.message);
}
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π₯3π1
Itβs been a quiet few weeks for official releases. This update marks one of the last in Node 20βs run as the active LTS release, and introduces experimental network inspection support. Node 22 will soon take over the active LTS crown (as per schedule) but what will its codename be given there are no elements starting with J? Amazingly, this question was asked six years ago and it's (probably) going to be Jod.
MichaΓ«l Zasso
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β€6π4π₯2
CHALLENGE β
const map = new Map();
const key1 = {};
const key2 = key1;
map.set(key1, "Value for key1");
map.set(key2, "Value for key2");
console.log(map.get({}));
console.log(map.get(key1));
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π3β€1
What is the output?
Anonymous Quiz
36%
undefined Value for key1
27%
undefined Value for key2
24%
Value for key2 Value for key2
14%
Value for key1 Value for key2
π₯8β€4π4π€£4
Hono is a neat, lightweight framework designed to run on any JavaScript runtime that has been picking up steam in the past year. You can create a simple app reminiscent of Express.js, say, but run it on Cloudflare Workers, Deno, Bun, or Node. Itβs in heavy use all over the place, and has lots of interesting features like letting you write HTML with JSX.
Yusuke Wada
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π4β€1π₯1
We're excited to announce that our newsletter reached 25,000 subscribers! This was one of our biggest goals for 2024, and we couldnβt have done it without your amazing support.
Thank you for being part of this journey. Weβve got more exciting content coming, so stay tuned!
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π₯29π8β€6π€©3
CHALLENGE β
Promise.resolve(1)
.then(value => {
console.log(value);
throw new Error('Something went wrong');
})
.then(() => {
console.log('This will not run');
})
.catch(error => {
console.log('Caught:', error.message);
return 42;
})
.then(value => {
console.log('Recovered with:', value);
});
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π€£64π9β€4π€1π€©1