Async JavaScript Errors Slip Through Try/Catch Blocks

Can you actually solve this Node.js event loop question? No running the code. No guessing. Just reasoning. I’m sharing a short Node.js snippet Your task is simple , but not easy 👇 Predict the exact output order Assume this runs in Node.js, not the browser Timers, Promises, nextTick, I/O, setImmediate are all involved One wrong assumption and the output breaks Most people get confident… then get it wrong The trick is not memorising order The trick is knowing when micro tasks interrupt phases And why poll vs check matters If you can explain why each line runs where it does, you actually understand the event loop. What’s the final output order? Drop it in the comments. #NodeJS #JavaScript #EventLoop #BackendInterviews #InterviewPrep #FullStack #SystemDesign

💡 𝐑𝐞𝐚𝐜𝐭 𝐇𝐨𝐨𝐤 – 𝐮𝐬𝐞𝐄𝐟𝐟𝐞𝐜𝐭 (API Call + Dependency Array) ❓ How do we fetch data from an API in React 𝘄𝗶𝘁𝗵𝗼𝘂𝘁 𝗶𝗻𝗳𝗶𝗻𝗶𝘁𝗲 𝗿𝗲-𝗿𝗲𝗻𝗱𝗲𝗿𝘀? Today I learned how useEffect is used for 𝗔𝗣𝗜 𝗰𝗮𝗹𝗹𝘀 and how the 𝗱𝗲𝗽𝗲𝗻𝗱𝗲𝗻𝗰𝘆 𝗮𝗿𝗿𝗮𝘆 controls when the effect runs 🚀 🔹 𝗪𝗵𝘆 𝘂𝘀𝗲𝗘𝗳𝗳𝗲𝗰𝘁 𝗳𝗼𝗿 𝗔𝗣𝗜 𝗰𝗮𝗹𝗹𝘀? 👉 React re-renders components often 👉 API calls should 𝗻𝗼𝘁 𝗿𝘂𝗻 𝗼𝗻 𝗲𝘃𝗲𝗿𝘆 𝗿𝗲𝗻𝗱𝗲𝗿 👉 useEffect helps control this behavior 🔹 𝗞𝗲𝘆 𝗽𝗼𝗶𝗻𝘁𝘀: 🔹 useEffect is used to handle 𝘀𝗶𝗱𝗲 𝗲𝗳𝗳𝗲𝗰𝘁𝘀 🔹 API calls are usually written 𝗶𝗻𝘀𝗶𝗱𝗲 𝘂𝘀𝗲𝗘𝗳𝗳𝗲𝗰𝘁 🔹 The 𝗱𝗲𝗽𝗲𝗻𝗱𝗲𝗻𝗰𝘆 𝗮𝗿𝗿𝗮𝘆 decides 𝘄𝗵𝗲𝗻 useEffect runs 🔹 𝗪𝗵𝗮𝘁 𝗱𝗼𝗲𝘀 𝘁𝗵𝗲 𝗱𝗲𝗽𝗲𝗻𝗱𝗲𝗻𝗰𝘆 𝗮𝗿𝗿𝗮𝘆 𝗱𝗼? 👉 [] → runs 𝗼𝗻𝗹𝘆 𝗼𝗻𝗰𝗲 when the component mounts 👉 [id] → runs when 𝗶𝗱 changes 👉 No array → runs on 𝗲𝘃𝗲𝗿𝘆 𝗿𝗲𝗻𝗱𝗲𝗿 ❌ 📌 This is why the dependency array is 𝘃𝗲𝗿𝘆 𝗶𝗺𝗽𝗼𝗿𝘁𝗮𝗻𝘁. Next up: 𝘂𝘀𝗲𝗘𝗳𝗳𝗲𝗰𝘁 cleanup function or real-world API handling? 🤔 #ReactJS #JavaScript #useEffect #APICall #ReactHooks #FrontendDevelopment #LearningInPublic

🆕 NEW BLOG! 🆕 🅰️ Modern Angular is easier than React. Here’s why. In this in-depth and neutral analysis, Riccardo Degni explores how modern Angular has evolved with Signals, zoneless rendering, and standalone components to deliver a simpler, more predictable developer experience, especially at scale. 👉 Read the full article on our website : https://lnkd.in/dnfRcypm #Angular #JavaScript #FrontendDevelopment #DeveloperExperience #iJSCon #WebDevelopment

I created a simple visual guide explaining the Node.js Event Loop. Understanding execution order helps prevent blocking issues and performance bugs. Let me know if you’d like a deeper breakdown 👇 #nodejs #javascript #backend #eventloop #webdevelopment

👉 Event Loop in Node.js JavaScript is single threaded, but Node.js can handle many tasks at the same time. This is possible because of the Event Loop. 👉 What Event Loop does -Continuously checks if the call stack is empty -Picks the next task from queues -Executes it without blocking the main thread 👉 How it works -Synchronous code runs in the call stack -Async tasks like timers, file system, and APIs go to background Once the stack is empty, Event Loop pushes tasks back to execution 👉 Execution order -Microtask queue → Promises, process.nextTick -Timers queue → setTimeout, setInterval -I O queue → file system, network calls -Check queue → setImmediate 👉 Why it matters -Handles thousands of requests efficiently -Keeps the application fast and non blocking 👉 Key point Node.js is single threaded, but highly concurrent because of the Event Loop. #nodejs #javascript #eventloop #backenddevelopment #webDevelopment

Ever wondered why process.nextTick() runs before Promises in Node.js? I created a short visual to explain how nextTick and Promise queues work inside the Node.js Event Loop and why their execution order matters. Understanding this helps avoid performance issues and unexpected behavior in async code. Let me know if this was helpful 👇 #nodejs #javascript #eventloop #backend #async #webdevelopment

Node.js – Day 6/30 What is the Event Loop? The Event Loop is the core mechanism that allows Node.js to handle multiple operations without blocking the main thread At a high level, this is what happens: o) Node.js executes synchronous code first o) Async operations (I/O, timers, promises) are offloaded o) Once completed, their callbacks are queued o) The Event Loop continuously checks these queues and executes callbacks when the call stack is free This is how Node.js: o) Remains single-threaded o) Handles thousands of concurrent requests o) Stays fast for I/O-heavy applications Understanding the Event Loop helped me clearly connect async/await, non-blocking I/O, and performance behavior in Node.js. #NodeJS #BackendDevelopment #EventLoop #JavaScript #LearningInPublic

TypeScript Tip: The ??= Operator Just learned about the Nullish Coalescing Assignment operator ( ??=) while building a logger utility! example would be this: long hand: if (singleton === null || singleton === undefined) { singleton = initLogger(); } You can write this: short hard: singleton ??= initLogger(); Perfect for: Singleton patterns ,Lazy initialization ,Default values , Caching strategies The beauty? It only assigns if the value is  null or undefined, not for other falsy values like 0 or "". #TypeScript #JavaScript #WebDev #CleanCode

Ever wonder why the #nodejs community is embedding #rust into their code? Well check out the performance we are getting with embedding logos in QR codes without the canvas library. The first 3 are using #rust with NAPI. The slowest we get is when we push a large amount of data across the nodejs to rust boundary using buffer. #typescript #javascript