Master Async/Await in JavaScript

What are Hooks? Hooks are special functions that allow you to use state and lifecycle features inside functional components. 🔹 useState 🧩 Manage and update component data easily without class components. 🔹 useEffect 🔄 Handle side effects like API calls, DOM updates, and subscriptions. 🔹 Why Hooks Matter? ⚡ Cleaner and shorter code 🔁 Reusable logic across components 🚀 Better readability and maintainability #ReactHooks #ReactJS #JavaScript #FrontendDev

⚡ Part 6 of 10: React performance conversations often start too early. Someone sees a rerender and immediately reaches for memoization. But sometimes the real issue is simpler than that. Bad state shape. Too much work inside render. Unclear data flow. A component tree that grew without much intention. I’m not against optimization. I just think the better starting point is: What actually feels slow? Where’s the bottleneck? What problem are we solving? A lot of React code gets more complicated in the name of performance without actually getting better. Have you ever seen “performance optimization” make a codebase worse? #React #ReactPerformance #FrontendPerformance #JavaScript #TypeScript #SoftwareEngineering #WebPerformance

🚀 Day 19/30 – JavaScript Challenge Solved: 2721. Execute Asynchronous Functions in Parallel 💡 Today’s concept: Promise.all (Parallel Execution) We were given multiple async functions and needed to execute them in parallel, not one by one. 👉 Key Idea: Start all async functions at once Track results in order Resolve only when all are completed Reject immediately if any fails ⚙️ Approach: ✔ Create a result array ✔ Maintain a counter ✔ Call all functions simultaneously ✔ Store results by index ✔ Resolve when count matches length #JavaScript #AsyncProgramming #Promises #LeetCode #WebDevelopment #Frontend

💡 Ever wondered how JavaScript handles multiple tasks at the same time… without actually being multi-threaded? That’s where the Event Loop comes in — the hidden hero behind JavaScript’s asynchronous magic 🚀 Let’s break it down in a simple way: 🔹 Call Stack This is where your code runs line by line. Functions are pushed onto the stack and executed one at a time. 🔹 Web APIs When you use things like "setTimeout", "fetch", or DOM events, they are handled outside the Call Stack by the browser (Web APIs). 🔹 Callback Queue (Task Queue) Once a task (like "setTimeout") is ready, its callback is placed in the queue, waiting for execution. 🔹 Microtask Queue This is a high-priority queue. It handles tasks like "Promises" and "async/await" before the normal callback queue. 🔹 Event Loop The Event Loop constantly checks: 👉 Is the Call Stack empty? 👉 If yes, it pushes tasks from the queues into the stack (Microtasks first, then Callbacks) 🎯 Takeaway: Understanding the Event Loop helps you write better asynchronous code, avoid bugs, and optimize performance. #JavaScript #WebDevelopment #Frontend #Coding #Developers

💡React Tip💡 ⚡️Referencing Store Data Do Not Always Re-render The Component Most developers make this mistake when working with Zustand, thinking that the component will re-render. But it won't. This video is from my Mastering Zustand course. To learn more such tips and build 2 large applications from scratch, check out my zustand course. 𝗖𝗼𝘂𝗿𝘀𝗲 𝗟𝗶𝗻𝗸 𝗶𝘀 𝗶𝗻 𝘁𝗵𝗲 𝗰𝗼𝗺𝗺𝗲𝗻𝘁. #javascript #reactjs #zustand #redux #webdevelopment

Still using JavaScript the same way you did a few years ago? 👀 Modern JavaScript (ES12) introduces features that make your code cleaner, more readable, and easier to maintain. From improved string methods to better number readability and new operators, these updates can simplify everyday development. Explore 10 JavaScript ES12 features every developer should know. 👉 Read more: https://lnkd.in/eJHf9qmY #JavaScript #WebDevelopment #CodingTips #Developers #Frontend #Syncfusion

Most developers don’t misunderstand JavaScript. They misunderstand time. . Take setTimeout vs setImmediate. On the surface, they look interchangeable. “Just run this later,” right? That’s the lie. Here’s the reality: setTimeout(fn, 0) → runs after the current call stack + timers phase setImmediate(fn) → runs in the check phase, right after I/O So under load or inside I/O cycles… they don’t behave the same at all. Example: You’re handling a heavy I/O operation (like reading a file or API response). setTimeout → might delay execution unpredictably setImmediate → executes right after the I/O completes One is scheduled. The other is strategically placed in the event loop. That difference? It’s the kind that causes race conditions no one can reproduce. Most people write async code. Very few understand when it actually runs. And that’s where bugs live. #JavaScript #NodeJS #Async #SoftwareEngineering #Backend

Can you cancel a Promise in JavaScript? Short answer: No — but you can cancel the work behind it. A Promise is just a result container, not the async operation itself. Once created, it will resolve or reject — you can’t “stop” it directly. What you can do instead: • Use AbortController → cancels APIs like fetch • Use cancellation flags/tokens → for custom async logic • Clear timers → if work is scheduled (setTimeout) • Ignore results → soft cancel pattern Real-world takeaway: Design your async code to be cancel-aware, not Promise-dependent. This is exactly how modern tools like React Query handle requests under the hood. #JavaScript #Frontend #AsyncProgramming #WebDevelopment #ReactJS #CleanCode

Still seeing var in 2026? That’s not legacy-that’s risk. Modern JavaScript demands clarity: const by default, let when needed, and zero tolerance for silent bugs. Small choices in syntax create big differences in production code. #JavaScript #WebDevelopment #CodingBestPractices #Developers #TechLearning