On January 14, 2006, John Resig introduced a JavaScript library called jQuery at BarCamp in New York City....
Timmy Willison
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🔥17❤12👍10🤣1
CHALLENGE
function* innerGenerator() {
yield 1;
yield 2;
return 'inner-done';
}
function* outerGenerator() {
yield 'start';
const result = yield* innerGenerator();
yield result;
yield 'end';
}
const gen = outerGenerator();
console.log(gen.next().value);
console.log(gen.next().value);
console.log(gen.next().value);
console.log(gen.next().value);
console.log(gen.next().value);❤11🔥5🤣1
What is the output?
Anonymous Quiz
18%
start 1 inner-done end undefined
47%
start 1 2 inner-done end
20%
start 1 2 undefined end
15%
start undefined undefined inner-done end
❤2👍2🤣1
Whether you agree or not, Ryan Dahl, the original creator of both Node.js and Deno, drew a lot of attention for a post on X (above) where he shared a thought on the shifting roles of modern software engineers in an agentic world.
❤6👍5🔥4🤣1
CHALLENGE
function processData() {
const results = [];
for (let i = 0; i < 3; i++) {
const multiplier = i + 1;
setTimeout(() => {
results.push(i * multiplier);
}, 0);
}
setTimeout(() => {
console.log(results.join(','));
}, 10);
}
processData();❤4👍2🔥2
🔥5👍3❤1
Got two similar objects or arrays and want to see the underlying differences? Superdiff has been around a while, but recent updates boost performance, add support for streamed input and using a worker for more efficient diffing in a background thread. The project now has a handy documentation site too.
antoine
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❤9🔥4👍3
CHALLENGE
class Calculator {
constructor(value) {
this.value = value;
}
add(num) {
this.value += num;
return this;
}
multiply(num) {
this.value *= num;
return this;
}
}
const calc = new Calculator(5);
const addMethod = calc.add;
const result = addMethod.call(calc, 3).multiply(2);
console.log(result.value);🔥8❤6👍4
🤔5🔥3❤2👍1
CHALLENGE
class EventEmitter {
constructor() {
this.events = new Map();
}
on(event, callback) {
if (!this.events.has(event)) {
this.events.set(event, []);
}
this.events.get(event).push(callback);
return this;
}
emit(event, ...args) {
const callbacks = this.events.get(event);
if (callbacks) {
callbacks.forEach(cb => cb(...args));
}
return this;
}
}
const emitter = new EventEmitter();
emitter.on('test', x => console.log(x * 2))
.on('test', x => console.log(x + 10))
.emit('test', 5);❤6👍3
👍7❤1
CHALLENGE
const obj = {
data: ['x', 'y', 'z'],
*[Symbol.iterator]() {
for (let i = this.data.length - 1; i >= 0; i--) {
yield this.data[i].toUpperCase();
}
}
};
const result = [];
for (const item of obj) {
result.push(item);
if (result.length === 2) break;
}
console.log(result.join('-'));❤13👍3🔥1
👍1
CHALLENGE
const x = 15;
const y = 10;
const z = 3;
const result1 = x & y;
const result2 = x | y;
const result3 = x ^ y;
const result4 = ~x;
const result5 = y << z;
const result6 = y >> 1;
console.log(`${result1},${result2},${result3},${result4},${result5},${result6}`);
🔥4❤3👍2
What is the output?
Anonymous Quiz
22%
5,15,10,-15,80,5
27%
10,14,5,-16,80,5
31%
10,15,5,-16,80,5
20%
10,15,5,-15,80,5
❤2
LibPDF bills itself as ‘the PDF library TypeScript deserves’ and supports parsing, modifying, signing and generating PDFs with a modern API in Node, Bun, and the browser. GitHub repo.
Documenso
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CHALLENGE
const wm = new WeakMap();
let obj1 = { name: 'John' };
let obj2 = { name: 'Jane' };
wm.set(obj1, 'developer');
wm.set(obj2, 'designer');
console.log(wm.get(obj1));
console.log(wm.has(obj2));
obj1 = null;
console.log(wm.get(obj1));
const normalObj = {};
try {
wm.set('string', 'value');
} catch (e) {
console.log('error');
}
👍6🔥2
What is the output?
Anonymous Quiz
38%
developer true null error
30%
John true undefined error
19%
developer false undefined error
12%
developer true undefined error
❤5🤔5👍2
A prolific JavaScript developer ported a Pokémon battle simulator to Rust and shares his experiences and techniques used to work around issues where Claude Code would get bogged down in such a large task. He notes “LLM-based coding agents are such a great new tool” but require “engineering expertise and constant babysitting”.
Christopher Chedeau
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CHALLENGE
console.log('start');
Promise.resolve().then(() => {
console.log('promise 1');
});
setTimeout(() => {
console.log('timeout');
}, 0);
Promise.resolve().then(() => {
console.log('promise 2');
}).then(() => {
console.log('promise 3');
});
console.log('end');❤5👍3🔥3