CHALLENGE
console.log('1');
Promise.resolve().then(() => {
console.log('2');
Promise.resolve().then(() => console.log('3'));
});
Promise.resolve().then(() => {
console.log('4');
});
setTimeout(() => console.log('5'), 0);
console.log('6');❤5👍4
“We’ve been busy,” says Cloudflare which recently announced it’s bringing Node.js HTTP server support to its Workers function platform. This post goes deep into the technicalities, covering what areas of the standard library is supported, how the file system works (Workers doesn’t have a typical file system), how input/output streams work, and more. And you can use all of this now.
James M Snell (Cloudflare)
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CHALLENGE
function processData() {
try {
console.log('processing');
return 'success';
} catch (error) {
console.log('error caught');
return 'failed';
} finally {
console.log('cleanup');
}
}
const result = processData();
console.log('result:', result);🔥1
What is the output?
Anonymous Quiz
13%
error caught cleanup result: failed
50%
processing cleanup result: success
21%
processing cleanup result: undefined
16%
processing result: success cleanup
❤3👍2
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CHALLENGE
class EventEmitter {
constructor() { this.events = {}; }
on(event, fn) { (this.events[event] ||= []).push(fn); }
emit(event, data) { this.events[event]?.forEach(fn => fn(data)); }
}
class Logger {
log(msg) { console.log(`LOG: ${msg}`); }
}
class Counter {
constructor() { this.count = 0; }
increment() { this.count++; console.log(this.count); }
}
function withLogging(target) {
const logger = new Logger();
return new Proxy(target, {
get(obj, prop) {
if (typeof obj[prop] === 'function') {
return function(...args) {
logger.log(`calling ${prop}`);
return obj[prop].apply(obj, args);
};
}
return obj[prop];
}
});
}
const emitter = withLogging(new EventEmitter());
const counter = new Counter();
emitter.on('tick', () => counter.increment());
emitter.emit('tick');
emitter.emit('tick');🤔3