React Performance Optimization: Focus on Bottlenecks First

📌 Part 8 of 10: A lot of React bugs make more sense once you realize state behaves more like a snapshot than a live variable. That idea sounds small. But once it clicks, a lot of confusing behavior starts making more sense. Why logs can feel misleading. Why updates don’t look immediate. Why handlers sometimes “see” older values than people expect. Once I really understood that, I stopped fighting React as much. I started designing with it instead. What React concept took longer to click for you than expected? #React #ReactJS #StateManagement #JavaScript #FrontendDevelopment #Debugging #TypeScript

⚛️ React Components Explained In React, everything is built using components. There are two types: • Functional Components – simple, modern, and use Hooks • Class Components – older, more complex, and less used today 👉 Today, developers prefer Functional Components for clean and scalable code. Are you using functional components in your projects? #ReactJS #FrontendDevelopment #JavaScript #WebDevelopment #Coding

Understanding the React Component Lifecycle is key to building efficient and scalable applications. From mounting to updating and unmounting, each phase plays a critical role in how components behave, manage data, and interact with the DOM. This visual breakdown highlights core lifecycle methods, real-world use cases, and best practices to help developers write cleaner, more predictable code. If you're working with React, mastering the lifecycle isn’t optional it’s foundational. #ReactJS #FrontendDevelopment #WebDevelopment #JavaScript #SoftwareEngineering

🚀 Day 967 of #1000DaysOfCode ✨ useEffect Hook in React (Explained Simply) `useEffect` is one of the most powerful hooks in React — but also one of the most misused. In today’s post, I’ve explained the `useEffect` hook in a simple and practical way, so you can understand how and when to use it correctly. From handling API calls to managing subscriptions and syncing data, `useEffect` helps you deal with side effects in your components. The tricky part is understanding dependencies — which often leads to bugs like infinite loops or missed updates. I’ve also covered common mistakes developers make and how to avoid them in real-world applications. If you’re working with React, mastering `useEffect` will make your code much cleaner and more predictable. 👇 What’s the most confusing part of `useEffect` for you — dependencies or execution timing? #Day967 #learningoftheday #1000daysofcodingchallenge #FrontendDevelopment #WebDevelopment #JavaScript #React #CodingCommunity #ReactJS

Handle Async Code Like a Pro! ⚡ Tired of messy .then() chains? Async/Await is the modern way to write asynchronous code that looks and behaves like regular, synchronous code. It makes your backend and frontend logic significantly cleaner and easier to read. Here is a quick breakdown of how to master Async/Await. 🚀 #javascript #asyncawait #webdevelopment #backend

Many React bugs are self created Not because React is hard But because we sometimes store things that React can calculate for us. Lets fix one common mistake Dont store derived values in state If a value can be created from existing state or props, you usually dont need useState. Avoid this practice function CartSummary() { const [items, setItems] = useState(3) const [pricePerItem, setPricePerItem] = useState(25) const [total, setTotal] = useState(0) useEffect(() => { setTotal(items * pricePerItem) }, [items, pricePerItem]) return <p>Total: ${total}</p> } Looks ok... but it adds => Extra render cycles => More logic to maintain => Chance of outdated values Better Approach function CartSummary() { const [items, setItems] = useState(3) const [pricePerItem, setPricePerItem] = useState(25) const total = items * pricePerItem return <p>Total: ${total}</p> } Cleaner, Faster and Easier to understand Sometimes the best React code is less React code. #React #JavaScript #Frontend #WebDevelopment #Coding

Stop writing React like it's 2021. 🛑 The ecosystem has evolved. If you want a cleaner, more performant codebase, it is time to upgrade your patterns: 🔄 Data Fetching: useEffect ❌ TanStack Query ✅ 🧠 Global State: Context API ❌ Zustand ✅ 📝 Forms: useState / useRef spam ❌ React Hook Form / React 19 Actions ✅ ⚡ Performance: useMemo / useCallback ❌ React Compiler ✅ 🎨 Styling: CSS-in-JS / bloated SCSS ❌ Tailwind CSS ✅ 🛡️ Validation: Manual checks & any ❌ Zod + TypeScript ✅ Less boilerplate. Fewer unnecessary re-renders. Better developer experience. What is a tool or pattern you finally stopped using this year? 👇 #ReactJS #WebDevelopment #Frontend #TypeScript #TailwindCSS

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

🚀 Understanding Node.js Internals: Event Loop & Thread Pool This week, I took a deeper dive into how Node.js actually works behind the scenes — and it completely changed how I think about asynchronous code. 🔹 JavaScript in Node.js runs on a single thread 🔹 Yet it handles multiple tasks efficiently using the Event Loop 🔹 Heavy operations are offloaded to the Thread Pool (via libuv) Some key takeaways: Event Loop manages execution in phases (Timers, I/O, setImmediate, etc.) setTimeout(0) is not truly immediate setImmediate() behaves differently inside vs outside I/O process.nextTick() runs before the event loop even starts Understanding these concepts makes async behavior much more predictable and helps write better backend code. Would love to hear your thoughts or corrections 🙌! Blog Link : https://lnkd.in/gxBA4DeT #JavaScript #WebDev #LearnInPublic #Blog #libuv #EventLoop #ThreadPool #ChaiCode Thanks to Hitesh Choudhary, Piyush Garg, Jay Kadlag, Akash Kadlag for guidance 😊

Deeply nested state updates in React are a silent productivity killer. If you've ever spent 10–15 minutes updating one tiny value inside a nested object you already know the pain. I used to mutate nested state directly — until it started affecting performance, debugging time, and even load time optimizations. Here’s a simple mindset shift that made my frontend code cleaner and easier to scale #React #FrontendDevelopment #ReactJS #JavaScript #useReducer #StateManagement #ReactHooks