I have this bit of code: setTimeout( () => console.log("setTimeout callback is complete"), 0); fetch("https://api.coingecko.com/api/v3/ping") .then(() => console.log("fetch callback is complete")); // busy-wait for a few seconds: for (let i = 0; i < 1000000; i++) { for (let j…
Promise.resolve(1) .then(x => console.log(1)) .catch(x => console.log(2)) .then(x => console.log(3)) Promise.reject(2) .then(x => console.log(4)) .catch(x => console.log(6)) .then(x => console.log(7)) result is "1 6 3 7", but if i add another then() before catch with console.log(6) result will be 1…
Executing the code below randomly either prints "DONE" or not, why does it happen? How do I make it go to the console.log("DONE"); line every time. const {Worker, isMainThread, parentPort} = require('node:worker_threads'); async function main() { if (isMainThread) { const…
I have a question regarding the order of operations in the below code snippet, const EventEmitter = require("events").EventEmitter; const messenger = new EventEmitter(); process.nextTick(() => { console.log("Next Tick"); }); messenger.on("message", (msg) => { console.log("Message: ", msg); }); messenger.emit("message", "Hello"); console.log("The…
From the website and some articles, i have learned that any changes made to the app will first be reflected in the Virtual DOM. and then to the Real DOM after diffing both trees. the lifecycle hook useEffect will fire…
I Have 4 Microservices, named "auth_ms","coin_ms","device_ms" and setting_ms. I'm running all 4 Microservices on different ports, for example: 3000, 3001, 3002 and 3003. My Question: By running these 4 servers on different port, do we have 4 event-loops ? if…
I've been testing some code to see how does NodeJS event loop actually works. So I get in touch with this piece of code: console.time('Time spending'); let list = []; for (let index = 0; index < 1000000; index++) {…