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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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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
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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
52%
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
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