Use this command (insert your preferred tool)
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❤8👍2🔥2
CHALLENGE
function highlight(strings, ...values) {
return strings.reduce((result, string, i) => {
const value = values[i] ? `<mark>${values[i]}</mark>` : '';
return result + string + value;
}, '');
}
const name = 'Sarah';
const age = 25;
const template = highlight`Hello ${name}, you are ${age} years old!`;
console.log(template);
const empty = highlight`No interpolation here`;
console.log(empty);1❤8
CHALLENGE
class EventManager {
constructor() {
this.listeners = new Map();
}
addListener(event, callback) {
if (!this.listeners.has(event)) {
this.listeners.set(event, new Set());
}
this.listeners.get(event).add(callback);
}
removeListener(event, callback) {
this.listeners.get(event)?.delete(callback);
}
}
const manager = new EventManager();
const handler = () => console.log('handled');
manager.addListener('click', handler);
manager.removeListener('click', () => console.log('handled'));
console.log(manager.listeners.get('click').size);What is the output?
Anonymous Quiz
18%
0
39%
TypeError: Cannot read properties of undefined of 'size'
32%
1
11%
undefined
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Supporting both browsers and Node.js, this library lets you read, write and convert popular media file formats (e.g. MP4, MP3, and more) without needing to lean on dependencies like FFmpeg. You can make thumbnails, extract metadata, write code that gets converted into a video, and more. GitHub repo.
Vanilagy
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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❤6👍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🔥3👍1
What is the output?
Anonymous Quiz
38%
1 8 3 4 6 7 2 5
28%
1 8 4 3 6 2 7 5
17%
1 8 3 6 4 7 2 5
16%
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
❤3🔥1
🎨 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.
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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);🔥3❤2
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