CHALLENGE
const data = { a: 1, b: 2, c: 3 };
const { a, ...rest } = data;
const newObj = { ...rest, a, d: 4 };
const arr = [1, 2, 3, 4, 5];
const [first, , third, ...remaining] = arr;
const result = [...remaining, third, first];
console.log(newObj);
console.log(result);A fantastic walkthrough of Chrome’s origins and its evolution over the years. Addy looks at key milestones (multi-process architecture for example), security, its steps into the world of AI, and more.
Addy Osmani
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1❤7👍2🔥2🤩2
CHALLENGE
console.log('1');
setTimeout(() => console.log('2'), 0);
Promise.resolve().then(() => console.log('3'));
queueMicrotask(() => console.log('4'));
setTimeout(() => console.log('5'), 0);
Promise.resolve().then(() => {
console.log('6');
return Promise.resolve();
}).then(() => console.log('7'));
console.log('8');❤6🔥4👍1
What is the output?
Anonymous Quiz
36%
1 8 3 4 6 7 2 5
29%
1 8 4 3 6 2 7 5
17%
1 8 3 6 4 7 2 5
17%
1 2 3 4 5 6 7 8
A project originally spawned from the BBC’s R&D department, Peaks renders audio waveforms to a canvas element and allows scrolling, zooming, and the sort of things you might otherwise see in an audio editor. LGPL licensed.
Chris Needham et al.
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CHALLENGE
class CustomError extends Error {
constructor(message) {
super(message);
this.name = 'CustomError';
}
}
try {
try {
throw new CustomError('inner error');
} catch (e) {
console.log(e.name);
throw new Error('outer error');
}
} catch (e) {
console.log(e.message);
console.log(e instanceof CustomError);
}❤1
What is the output?
Anonymous Quiz
43%
CustomError outer error false
32%
CustomError inner error true
17%
Error outer error false
8%
CustomError outer error true
❤5🔥2
🎨 Eyecons is a VS Code icon theme that automatically adapts the color of icons to fit your editor's main theme – well, from this list anyway.
👍7❤1🔥1
CHALLENGE
const original = {
name: 'Sarah',
scores: [85, 92, 78],
details: {
age: 25,
city: 'Portland'
}
};
const copy1 = { ...original };
const copy2 = JSON.parse(JSON.stringify(original));
copy1.name = 'Emma';
copy1.scores.push(95);
copy1.details.age = 30;
console.log(original.name, original.scores.length, original.details.age);❤5🔥4👍1
❤4👍2
In July, Socket warned us about a phishing campaign targeting npm package publishers. Sadly, a prolific package author (among others, like DuckDB, who explain how the attack worked on them) fell victim to the scam, resulting in some popular packages becoming compromised (like Chalk, debug, and others).
Gooding, Brown, et al. (Socket)
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CHALLENGE
const createLogger = (prefix) => (message) => `${prefix}: ${message}`;
const createCounter = () => {
let count = 0;
return () => ++count;
};
const withLogging = (fn) => (...args) => {
const result = fn(...args);
console.log(`Called with: ${args}, Result: ${result}`);
return result;
};
const counter = createCounter();
const loggedCounter = withLogging(counter);
const logger = createLogger('INFO');
console.log(loggedCounter());
console.log(logger(loggedCounter()));👍6❤2
CHALLENGE
function createCounter() {
let count = 0;
return {
increment: () => ++count,
decrement: () => --count,
getValue: () => count
};
}
const counter1 = createCounter();
const counter2 = createCounter();
counter1.increment();
counter1.increment();
counter2.increment();
console.log(counter1.getValue() + counter2.getValue());CHALLENGE
const original = {
name: 'Emma',
skills: ['JavaScript', 'Python'],
config: { theme: 'dark', notifications: true }
};
const copy1 = { ...original };
const copy2 = JSON.parse(JSON.stringify(original));
const copy3 = Object.assign({}, original);
copy1.name = 'Sarah';
copy1.skills.push('React');
copy1.config.theme = 'light';
console.log(original.name);
console.log(original.skills.length);
console.log(original.config.theme);❤3🤣2
What is the output?
Anonymous Quiz
30%
Emma, 3, light
29%
Sarah, 2, dark
23%
Emma, 2, dark
18%
Sarah, 3, light
🤔6👍2
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