The latest cutting edge version of Node has arrived with Web Storage enabled by default, JSON.stringify perf improvements, a new --allow-net option in the permission model, built-in Uint8Array base64/hex conversion, and WebAssembly and JIT optimizations. As shown in the diagram above, this means Node 24 will soon be promoted to being the 'active' LTS release and Node 22 will enter its 'maintenance' LTS phase.
Rafael Gonzaga
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👍12❤4🔥1
CHALLENGE
function Vehicle(type) {
this.type = type;
}
Vehicle.prototype.describe = function() {
return `This is a ${this.type}`;
};
function Car(brand) {
Vehicle.call(this, 'car');
this.brand = brand;
}
Car.prototype = Object.create(Vehicle.prototype);
Car.prototype.constructor = Car;
Car.prototype.describe = function() {
return Vehicle.prototype.describe.call(this) + ` made by ${this.brand}`;
};
const tesla = new Car('Tesla');
console.log(tesla.describe());
console.log(tesla.constructor.name);❤2
What is the output?
Anonymous Quiz
30%
This is a Tesla made by Tesla Car
39%
This is a car made by Tesla Car
19%
This is a Tesla Vehicle
12%
This is a car made by Tesla Vehicle
1❤4🔥2👍1
A minimal CheatEngine implementation built with Rust and a terminal UI.
Do you think it’s possible to create something similar with JavaScript?
Do you think it’s possible to create something similar with JavaScript?
❤2👍2🤔2🔥1
CHALLENGE
const Maybe = {
of: (value) => ({ value, map: f => value == null ? Maybe.nothing() : Maybe.of(f(value)) }),
nothing: () => ({ value: null, map: () => Maybe.nothing() })
};
const result = Maybe.of(5)
.map(x => x * 2)
.map(x => x > 15 ? null : x)
.map(x => x + 1)
.map(x => x.toString());
console.log(result.value);🤔7❤1👍1
🤔6❤2👍2
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);
}
removeAllListeners() {
this.listeners.clear();
}
}
const manager = new EventManager();
const obj = { data: new Array(1000).fill('memory') };
manager.addListener('test', () => obj.data.length);
manager.removeAllListeners();
console.log(manager.listeners.size);🔥2❤1👍1
The Vite-powered, Jest-compatible testing framework introduces visual regression testing, makes its ‘Browser Mode’ stable (for running tests in a browser directly), adds Playwright Traces support, and more. Still unsure? You can compare it with other test runners here.
VoidZero and Contributors
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❤3👍2🔥1
CHALLENGE
async function fetchData() {
return Promise.resolve('data');
}
async function processData() {
const result = await fetchData();
console.log('Processing:', result);
return result.toUpperCase();
}
const promise = processData();
console.log('Promise:', promise);
promise.then(value => {
console.log('Final:', value);
});CHALLENGE
class DataProcessor {
constructor(transform) {
this.transform = transform;
}
process(data) {
return this.transform(data);
}
}
const multiply = x => x * 2;
const addTen = x => x + 10;
const toString = x => `Result: ${x}`;
const compose = (...fns) => x => fns.reduceRight((acc, fn) => fn(acc), x);
const processor = new DataProcessor(compose(toString, addTen, multiply));
console.log(processor.process(5));❤3👍2🔥1
It’s been more than four years since we linked to Sindre's handy resource, but it continues to get updates and tweaks (and, if you want, you can contribute a submission too – though the bar is quite high).
Sindre Sorhus
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CHALLENGE
const target = { name: 'Sarah', age: 25 };
const handler = {
get(obj, prop) {
if (prop in obj) {
return obj[prop].toString().toUpperCase();
}
return `Property ${prop} not found`;
},
set(obj, prop, value) {
obj[prop] = value * 2;
return true;
}
};
const proxy = new Proxy(target, handler);
proxy.salary = 50000;
console.log(proxy.name);
console.log(proxy.age);
console.log(proxy.salary);
console.log(proxy.city);What is the output?
Anonymous Quiz
51%
SARAH 25 100000 Property city not found
37%
SARAH 25 50000 Property city not found
12%
Sarah 25 50000 undefined
0%
Sarah age salary city
🔥2❤1👍1