Avoid Using useEffect for Data Transformation in React

💠 Understanding the Cleanup Function in React 🔹 When React components run effects (like fetching data, setting up event listeners, or using timers), sometimes those effects keep running even after the component is gone or re-rendered. 🔹 That’s where the cleanup function comes in. 🔹It helps “clean up” or cancel anything that shouldn’t continue once the component is unmounted or updated.  ▫️ Why Cleanup Is Important 🔸 Without cleanup functions, your app can 🔸Keep running unnecessary background tasks Cause memory leaks 🔸Lead to unexpected behavior when the component re-renders ▫️ Real-Life Use Cases 🔸Clearing timers or intervals 🔸 Removing event listeners 🔸Canceling API requests 🔸 Disconnecting WebSocket connections #ReactJS #WebDevelopment #Frontend #JavaScript #LearnReact #CodingTips #ReactHooks #CleanCode #DeveloperCommunity

🧠 𝗧𝗼𝗱𝗮𝘆’𝘀 𝗟𝗲𝗮𝗿𝗻𝗶𝗻𝗴 𝗮𝘀 𝗮 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿 I’ve always known what a closure is... but I realized today — I’ve never really used one consciously in my React or Next.js apps. 🤔 So I asked myself — 👉 Where do closures actually show up in real projects? Turns out, 𝐞𝐯𝐞𝐫𝐲𝐰𝐡𝐞𝐫𝐞. ✅ In debounce or throttle functions to delay API calls ✅ In custom hooks that remember previous values ✅ In event listeners where inner functions access parent state ✅ In private variables that survive outside their original scope Closures are one of those 𝐬𝐢𝐥𝐞𝐧𝐭 𝐡𝐞𝐫𝐨𝐞𝐬 of JavaScript — you might not notice them, but they’re powering your code behind the scenes every day. ⚡ #TodayILearned #JavaScript #React #Nextjs #FrontendDevelopment #WebDevelopment #LearningInPublic #Closures #DevJourney

React useEffect: The Most Overused Hook in the Entire React Ecosystem  🔄 useEffect is one of the most powerful hooks in React — but it’s also one of the most misunderstood. Many developers use it more than necessary simply because it feels like the “go-to” solution for almost everything. Here’s a clear rule that simplifies everything 👇 ⚠️ If your logic doesn’t depend on a SIDE EFFECT… you don’t need useEffect. And yes — removing unnecessary effects can instantly boost performance. ❌ The common mistake: Using useEffect for things like: • Setting state from props • Filtering data • Simple calculations • UI logic that could run inside the component All of these cause extra re-renders, slow down the app, and create bugs. ✅ When useEffect is ACTUALLY NEEDED: Use it ONLY for real side effects: ✔️ Fetching data (API calls) ✔️ Subscribing to events ✔️ Setting up listeners ✔️ Syncing with external systems ✔️ Handling timers/timeouts If it doesn’t fall into these categories…👉 Remove the effect. Your component becomes faster and cleaner. 🎯 Pro Tip: Before writing any useEffect, ask yourself: “Will this code run fine without useEffect?” If the answer is YES — don’t use it. #ReactJS #Frontend #WebDevelopment #JavaScript #ReactHooks #CleanCode #PerformanceOptimization

A Simple Guide to React’s 𝐮𝐬𝐞𝐄𝐟𝐟𝐞𝐜𝐭 Hook --> 𝐄𝐯𝐞𝐫 𝐰𝐨𝐧𝐝𝐞𝐫𝐞𝐝 𝐰𝐡𝐚𝐭 exactly 𝐮𝐬𝐞𝐄𝐟𝐟𝐞𝐜𝐭 does and why it’s so important? 𝐖𝐡𝐚𝐭 𝐢𝐬 𝐮𝐬𝐞𝐄𝐟𝐟𝐞𝐜𝐭? useEffect is a React Hook that lets you perform side effects in functional components — like fetching data, updating the DOM, or setting up event listeners. In simple words: it tells React to “𝐝𝐨 𝐬𝐨𝐦𝐞𝐭𝐡𝐢𝐧𝐠 𝐚𝐟𝐭𝐞𝐫 𝐫𝐞𝐧𝐝𝐞𝐫𝐢𝐧𝐠.” 𝐖𝐡𝐲 𝐝𝐨 𝐰𝐞 𝐮𝐬𝐞 𝐮𝐬𝐞𝐄𝐟𝐟𝐞𝐜𝐭? Because not everything in React is about 𝐫𝐞𝐧𝐝𝐞𝐫𝐢𝐧𝐠 𝐭𝐡𝐞 𝐔𝐈. Sometimes, your app needs to interact with the outside world — 𝐀𝐏𝐈𝐬, 𝐬𝐭𝐨𝐫𝐚𝐠𝐞, 𝐨𝐫 𝐞𝐯𝐞𝐧 𝐛𝐫𝐨𝐰𝐬𝐞𝐫 𝐞𝐯𝐞𝐧𝐭𝐬. useEffect helps you run that code after the component renders, without breaking the React flow. 𝐓𝐡𝐞 𝐏𝐨𝐰𝐞𝐫 𝐨𝐟 𝐮𝐬𝐞𝐄𝐟𝐟𝐞𝐜𝐭? It gives you full control over 𝐰𝐡𝐞𝐧 𝐚𝐧𝐝 𝐡𝐨𝐰 𝐨𝐟𝐭𝐞𝐧 𝐲𝐨𝐮𝐫 𝐞𝐟𝐟𝐞𝐜𝐭 𝐫𝐮𝐧𝐬. With the dependency array, you can decide: [ ] → run once [data] → run when data changes (no array) → run on every render Clean, predictable, and no infinite loops Follow [Akash Tolanur] for more such react contents #React #ReactJS #javaScript #frontend #WebDevelopment #ReactHooks

👀 Eye opening fact about Node.js 👇 console.log is a hidden trap in #Node.js. While it may be sitting in your codebase looking like a innocent debug measure, it can drastically hit your app performance. Thinking why ? console.log invoked process.stdout.write under the hold which actually write to #TTY (terminal) synchronously which actually blocks the event loop. Have a look at results of load testing. 👇 While it's different in browsers due to #DevTools. Instead use pino or Winston for async logging, ditch console.log. #javascript #typescript #MERN #MEAN #express #JS #backendengineering

Day 11 of 30 Days of React — Events! Every app reacts to something clicks, typing, or mouse moves. These are events—and React makes them super clean to handle. In HTML you’d do this: <button onclick="greetPeople()">Click</button> In React, you pass a function instead: <button onClick={greetPeople}>Click</button> 🔑 Key lessons from today: React event names use camelCase (onClick, onChange, onSubmit) You attach functions directly — no quotes Always call preventDefault() if you want to stop default browser behavior Today I built a mini event playground where every click, keystroke, and mouse move updates the state live. It’s simple, reactive, and satisfying to watch. ⚛️🔥 #React #30DaysOfReact #FrontendDevelopment #CodingJourney #WebDev #JavaScript

When I began working with React, I believed making an API call was straightforward — fetch(), set state, and you're done. But that is never the case in a real-world project. 😅 The real issue starts when you need to: - Manage loading, error, and success states - Cancel requests on component unmount - Avoid unnecessary re-renders - Synchronize your UI and data! Here is my current way of dealing with it 👇 ⚙️ Using custom hooks such as useFetch or useQuery to manage API logic outside of the UI. 🧠 Add caching + or library (React Query / SWR) — cuts down on redundant calls and makes the app feel instantaneous. 🔄 Centralize your API configs with axios interceptors so headers, tokens, and errors are handled once instead of all over the app. 🚫 Never call setState after unmounting the component - always cleanup async effects to avoid memory leaks. The goal is not just to "call APIs." It is to create resilient predictable data flows that can scale with your project. What is your favorite pattern to make API calls in React? #reactjs #frontend #javascript #webdevelopment #mernstack #reactquery #axios #developers

Building Real-Time Full-Stack Applications: A Complete Guide Ever wondered how apps like Notion, Linear, or Discord keep everything in sync across thousands of users? Here's how real-time works under the hood — and how you can build it yourself. https://lnkd.in/g8fxnTYa #FullStack #WebSockets #RealTime #WebDevelopment #NextJS #React #Supabase #JavaScript #TypeScript #SoftwareEngineering

𝗧𝗵𝗲 𝘂𝘀𝗲𝗘𝗳𝗳𝗲𝗰𝘁 𝗱𝗲𝗽𝗲𝗻𝗱𝗲𝗻𝗰𝘆 𝗮𝗿𝗿𝗮𝘆 𝗵𝗲𝗮𝗱𝗮𝗰𝗵𝗲 𝗶𝘀 𝗼𝗳𝗳𝗶𝗰𝗶𝗮𝗹𝗹𝘆 𝗼𝘃𝗲𝗿! For years, React developers have struggled with effects re-running unnecessarily because we needed the latest 𝘀𝘁𝗮𝘁𝗲/𝗽𝗿𝗼𝗽𝘀 (like cart item counts), but didn’t want the effect (like a page view tracker) to fire every time. The 𝘂𝘀𝗲𝗘𝗳𝗳𝗲𝗰𝘁𝗘𝘃𝗲𝗻𝘁 hook, now stable in 𝗥𝗲𝗮𝗰𝘁 𝟭𝟵.𝟮, is the official permanent solution. 𝗜𝘁 𝘀𝗲𝗽𝗮𝗿𝗮𝘁𝗲𝘀 𝘁𝗵𝗲 𝘁𝘄𝗼 𝗰𝗼𝗻𝗰𝗲𝗿𝗻𝘀: 1️⃣ The “what” → the event data / latest state 2️⃣ The “when” → the effect trigger / dependencies This solves one of React’s biggest pain points cleanly and legally. Are you ready to retire your old workarounds? 🚀 #ReactJS #React19 #WebDevelopment #FrontendDevelopment #JavaScript #useEffectEvent

Can You Guess the Output? (Challenge #9 – The useMemo Trap) Sometimes optimization in React creates more bugs than it fixes 😅 Here’s a real-world example 👇 function Child({ config }) { React.useEffect(() => { console.log("Effect ran"); }, [config]); return <p>{config.theme}</p>; } export default function App() { const [count, setCount] = React.useState(0); const config = React.useMemo(() => ({ theme: "dark" }), []); return ( <div> <Child config={config} /> <button onClick={() => setCount(count + 1)}>+</button> </div> ); } 🧩 Question: You click the “+” button 3 times. 👉 How many times does "Effect ran" appear in the console? And why? (Hint: think about dependency identity and memoization behavior) 💬 Drop your answer + reasoning below 👇Let’s see who really understands how useMemo and React’s dependency array work ⚙️ #React #JavaScript #Nextjs #Frontend #TypeScript #useMemo #Hooks #CleanCode #Performance #DeveloperCommunity #InterviewPreparation #WebDevelopment