What is the output?
Anonymous Quiz
30%
This is a Tesla made by Tesla Car
38%
This is a car made by Tesla Car
18%
This is a Tesla Vehicle
13%
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));🔥1
❤4👍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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❤4👍2🔥2
CHALLENGE
const target = { name: 'Sarah', age: 25 };
const handler = {
get(obj, prop) {
if (prop in obj) {
return obj[prop].toString().toUpperCase();
}
return `Property ${prop} not found`;
},
set(obj, prop, value) {
obj[prop] = value * 2;
return true;
}
};
const proxy = new Proxy(target, handler);
proxy.salary = 50000;
console.log(proxy.name);
console.log(proxy.age);
console.log(proxy.salary);
console.log(proxy.city);What is the output?
Anonymous Quiz
49%
SARAH 25 100000 Property city not found
37%
SARAH 25 50000 Property city not found
13%
Sarah 25 50000 undefined
1%
Sarah age salary city
🔥3❤1👍1
CHALLENGE
function highlight(strings, ...values) {
return strings.reduce((result, string, i) => {
const value = values[i] ? `<mark>${values[i]}</mark>` : '';
return result + string + value;
}, '');
}
const name = 'Sarah';
const skill = 'React';
const template = highlight`Hello ${name}, you're great at ${skill}!`;
console.log(template);