What is the output?
Anonymous Quiz
30%
1 50 10 50 1 50
27%
10 99 10 99 10 99
19%
1 2 10 2 1 2
25%
1 99 10 99 1 99
❤5🔥3👍2
Four stalwarts of the JavaScript ecosystem all shipped notable releases this week, and odds are you're using at least one of them:
• Gatsby v5.16 proves Gatsby, once considered neck-and-neck with Next.js in the React world, is not 'dead'. The headline feature is React 19 support.
• Babel 7 just shipped its final release. "After years in the making, Babel 8 is finally ready," in release candidate form, at least.
• Rspress 2.0 is a major release for the high-performance Rust-powered, but JavaScript-facing, static site generator.
• Lodash 4.17.23 sounds minor, but it's a 'security reset' for the still heavily used utility library and is designed to provide a base for a longer future.
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🔥7👍3❤2
CHALLENGE
const memoize = (fn) => {
const cache = new Map();
return (...args) => {
const key = JSON.stringify(args);
if (cache.has(key)) return cache.get(key);
const result = fn(...args);
cache.set(key, result);
return result;
};
};
const fibonacci = memoize((n) => {
if (n <= 1) return n;
return fibonacci(n - 1) + fibonacci(n - 2);
});
console.log(fibonacci(10));
console.log(fibonacci(5));
console.log(fibonacci(10));🔥6👍1
❤2👍1🔥1
Why use a proper locale-aware API to parse numbers when you can hand-roll a maze of string splits, separator swaps, and implicit type coercions that silently break on edge cases?
Remy Porter (The Daily WTF)
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CHALLENGE
let counter = 0;
const increment = () => ++counter;
const getValue = () => counter;
const obj = {
get value() {
increment();
return getValue();
}
};
console.log(obj.value);
console.log(obj.value);
console.log(counter);
❤6👍1🔥1
❤2👍2🔥1
Generate customized interactive heatmaps (think GitHub contributions graph), or render heatmaps as lines and bar charts. The site is packed with demos to enjoy. GitHub repo.
William Troup
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❤8🔥5👍3
CHALLENGE
const target = { name: "Sarah", age: 25 };
const handler = {
get(obj, prop) {
if (prop === 'greeting') {
return `Hello, I'm ${obj.name}`;
}
return obj[prop]?.toString().toUpperCase() || 'UNKNOWN';
},
set(obj, prop, value) {
if (typeof value === 'string') {
obj[prop] = value.toLowerCase();
} else {
obj[prop] = value * 2;
}
return true;
}
};
const proxy = new Proxy(target, handler);
console.log(proxy.name);
proxy.city = "Boston";
proxy.score = 15;
console.log(proxy.greeting);
console.log(proxy.city + " " + proxy.score);👍11🔥3❤2
What is the output?
Anonymous Quiz
31%
SARAH Hello, I'm Sarah boston 30
32%
sarah Hello, I'm Sarah boston 15
16%
SARAH Hello, I'm sarah boston 30
21%
SARAH Hello, I'm Sarah BOSTON 30
❤5👍1
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❤5👍4🔥3
CHALLENGE
class DataProcessor {
static #cache = new Map();
static #initialized = false;
static {
console.log('First block');
this.#cache.set('default', 'value1');
}
static {
console.log('Second block');
this.#cache.set('config', 'value2');
this.#initialized = true;
}
static getStatus() {
return `${this.#cache.size}-${this.#initialized}`;
}
}
console.log(DataProcessor.getStatus());What is the output?
Anonymous Quiz
23%
Second block First block 2-true
30%
First block Second block 2-false
14%
2-true First block Second block
33%
First block Second block 2-true
👍3❤1
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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❤3👍3🔥1
CHALLENGE
const obj1 = { a: 1, b: { c: 2 } };
const obj2 = { ...obj1 };
const obj3 = obj1;
obj2.a = 10;
obj2.b.c = 20;
obj3.b.c = 30;
console.log(obj1.a);
console.log(obj1.b.c);
console.log(obj2.a);
console.log(obj2.b.c);
console.log(obj3.a);
console.log(obj3.b.c);❤4
What is the output?
Anonymous Quiz
35%
1 30 10 30 1 30
28%
1 20 10 20 1 20
26%
1 2 10 20 1 2
11%
10 20 10 20 10 20
❤5🔥2👍1
The results of the popular annual JavaScript survey are out, and we’re focusing on the most relevant bit to Node.js: backend frameworks. Express still leads the way, but NestJS continues to grow rapidly. Meanwhile, Hono comes top in developer satisfaction.
Devographics
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CHALLENGE
function memoize(fn) {
const cache = new Map();
return function(...args) {
const key = JSON.stringify(args);
if (cache.has(key)) {
return cache.get(key);
}
const result = fn.apply(this, args);
cache.set(key, result);
return result;
};
}
const fibonacci = memoize(function(n) {
if (n <= 1) return n;
return fibonacci(n - 1) + fibonacci(n - 2);
});
console.log(fibonacci(10));
console.log(fibonacci.cache?.size || 'undefined');🔥1
❤2👍2🔥1
Have you ever wondered how systems are designed to ensure reliable event delivery and processing? How can we minimise event loss to a very low level: or even achieve near-zero message loss and highly reliable processing?
nairihar
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