React Mastery: Ignore Tutorials, Focus on Problem-Solving

4 React Native mistakes that silently killed our app's performance. I've seen these in almost every project I've worked on — including my own early code. 1. Using anonymous functions in render Passing () => doSomething() inline creates a new function reference on every render. For Flatlists with 50+ items, this tanks performance invisibly. Move handlers outside or use useCallback. 2. Not using keyExtractor properly Skipping a stable keyExtractor forces React Native to re-render the entire list on any data change. One line fix. Massive impact. 3. Overusing state for things that don't need re-renders Storing values like scroll position or timer refs in useState causes unnecessary re-renders. useRef is your friend for values that change but don't need to trigger UI updates. 4. Skipping Hermes on older projects If you're still on a project without Hermes enabled, you're leaving significant startup-time improvements on the table. It's a config change, not a rewrite. The worst part? None of these throws errors. The app feels... slow. And users leave. Which of these have you run into? Drop it in the comments — I'm curious if #3 is as common as I think it is. 🤔 #ReactNative #MobileDev #ReactNativeDev

𝗜𝗻𝘁𝗲𝗿𝗻𝗮𝘁𝗶𝗼𝗻𝗮𝗹𝗶𝘇𝗶𝗻𝗴 𝗬𝗼𝘂𝗿 𝗥𝗲𝗮𝗰𝘁 𝗔𝗽𝗽 You used to spend a whole weekend finding every hardcoded string in your React app, wrapping each one in a t() call, and adding useTranslation() hooks. But now, you can do it in just a few steps. Let's take a React + Vite + TypeScript project and turn it into a cloud-synced, multi-language app. - Run `npx i18next-cli instrument` to wrap hardcoded strings and inject hooks. - Run `npx i18next-cli extract` to generate local translation JSON. - Run `npx i18next-cli locize-migrate` to push everything to Locize. - Run `npx i18next-cli locize-download` to pull auto-translated files back locally. You can upgrade to i18next-locize-backend to fetch translations dynamically, no re-deploy needed. You can also use saveMissing to auto-register new keys from your running app. Add the Locize InContext Editor to edit translations visually in the browser. Use locize-lastused to track and clean up stale keys. You can check your project's i18n health with `npx i18next-cli status`. Source: https://lnkd.in/gXNarWdy

Stop making your users download your entire app at once. 🛑 In 2026, user patience is at an all-time low. If your React bundle is 5MB, your bounce rate will be just as high. The secret to a "miracle" load time? Lazy Loading. What is Lazy Loading? 🧊 Instead of loading every component, route, and library the moment a user hits your URL, you only load what they actually see. The Dynamic Duo: React.lazy + Suspense By using these two, you can split your code into smaller "chunks." The browser only downloads the chunk when it's needed. How to do it in 3 steps: 1. Identify heavy components Any large component (like a Dashboard Chart, a heavy Data Table, or a Modal) shouldn't be in the main bundle. 2. Wrap with React.lazy Instead of a standard import, do this: const HeavyChart = React.lazy(() => import('./components/HeavyChart')); 3. Provide a Fallback with Suspense Tell React what to show while the "chunk" is downloading. <Suspense fallback={<SkeletonLoader />}> <HeavyChart /> </Suspense> Why this matters for your career in 2026: Lighthouse Scores: It drastically improves your Largest Contentful Paint (LCP). Mobile Experience: Users on 4G/5G won't struggle with massive JavaScript execution. Cost: Less data transferred = lower hosting/egress costs for your company. Pro-Tip: Don’t lazy load everything. Your "Above the Fold" content (Navbar, Hero Section) should load immediately. Lazy load everything else. Are you still shipping "Monolith" bundles, or have you mastered Code Splitting? Let’s talk performance in the comments! 👇 #ReactJS #WebPerformance #FrontendDevelopment #JavaScript #CodingTips #SoftwareEngineering #WebDev2026 #CleanCode #ReactHooks

Building modern web apps with #React.js is not just about writing code — it’s about creating smooth, scalable, and user-friendly experiences. With tools like Next.js and smart use of AI, development is becoming faster and more efficient than ever. The key is to stay updated, keep learning, and focus on clean, maintainable code. Always building. Always improving. 🚀 #ReactJS #NextJS #Frontend #WebDevelopment #JavaScript #AI

🤔 “Why is my API calling twice?”..... When I first used useEffect, I wrote this: useEffect(() => { fetchData() }, []) I expected it to run once. But in development… it ran twice. 😵 After some digging, I learned something interesting 👇 ⚛️ React Strict Mode If your app is wrapped like this: <React.StrictMode> <App /> </React.StrictMode> React will intentionally run useEffect twice in development. Not a bug. It’s React checking for: • unsafe side effects • missing cleanup logic • unexpected mutations ✅ Important: This only happens in development, not in production builds. So next time your API fires twice… before debugging for hours — check Strict Mode first. React sometimes teaches us things in surprising ways. 🚀 #React #ReactNative #useEffect #SoftwareEngineering

React props crashed my app… thanks to AI. 🙃 While working with my VIBE coded react app, I ran into a component that kept re-rendering infinitely. At first glance the code looked perfectly fine. But the issue was hidden in a small detail: ——————————————— const MyComponent = ({ data = [] }) => { const [items, setItems] = useState([]) useEffect(() => { setItems(data) }, [data]) } ——————————————— React props are immutable, so it’s easy to assume this should be stable. But here’s the catch. Default values in destructuring are re-evaluated on every render. That means if data isn’t passed, React creates a brand new array [] every render. And since in JavaScript: [] !== [] React thinks the dependency changed → useEffect runs again → state updates → re-render → new array → loop continues. Here is how I fixed it: Move the default reference outside the component so it stays stable. ——————————————— const DEFAULT_DATA = [] const MyComponent = ({ data = DEFAULT_DATA }) => { const [items, setItems] = useState([]) useEffect(() => { setItems(data) }, [data]) } ——————————————— There are other production grades way also to fix these type of infinite loop issues: • Always use primitives in dependencies of useEffect — instead of passing the entire array/object to the dependency array, depend on something like data.length or a specific primitive property. • Stringify the dependency — JSON.stringify(data) can ensure the effect only runs when the actual content changes. Small detail. But these are the kinds of things that can quietly break production apps. #ReactJS #FrontendEngineering #JavaScript #WebDevelopment #Debugging #BuildInPublic

🚀 React Series Part 4: Props vs. State If React components were actors in a play, Props would be their script (what they're given to say), and State would be their mood (how they feel and change internally). Understanding the "Why" behind these two is the moment React finally "clicks." Let’s break it down 👇 💡 What are Props? (The "Inputs") Think of props like arguments to a function. They help make components reusable and dynamic. For example, a Button component doesn’t need to know its label until the parent provides it: 👉 <Button label="Click Me" /> 📌 Rule: A component must never modify its own props (they are read-only). 💡 What is State? (The "Memory") State is the internal data of a component. It is used for things that change over time: • User input • UI interactions (like modals, toggles) • API data When state changes, React automatically re-renders the component to reflect the updated UI. 🔥 The "Golden Loop" of Data Flow In a well-structured React app, data flows in one direction: 👉 State lives in the parent component 👉 The parent passes data down as props 👉 The parent also passes functions as props 👉 The child calls those functions to request updates 👉 The parent updates state → UI updates This is called one-way data flow. 🧠 Simple takeaway Props = Input from outside ⬇️ State = Internal data inside 🔁 Let’s keep going 🚀 #ReactJs #Learning

I used to think React state was “just a variable that updates the UI.” It’s not. After diving deeper into React JS, I realized state is the heartbeat of your application. If you manage it well, your app feels smooth, predictable, and scalable. If you don’t… chaos. Here’s what I truly learned about React state: 🔹 State is reactive, not imperative You don’t manually update the DOM. You update state, and React handles the rest. That mental shift changes everything. 🔹 State updates are asynchronous You can’t always rely on the current value immediately after calling setState. Understanding batching and re-renders prevents subtle bugs. 🔹 Local vs Global State matters Not everything belongs in global state. Over-engineering with unnecessary global stores creates complexity instead of clarity. 🔹 Derived state is often a mistake If something can be calculated from existing state or props, don’t store it. Compute it. 🔹 Lifting state up is powerful Shared state between components isn’t about duplication — it’s about control and single sources of truth. 🔹 Performance depends on structure Poor state structure = unnecessary re-renders. Clean separation = efficient UI updates. The biggest lesson? React isn’t about components. It’s about data flow discipline. Once you understand state deeply, building scalable frontends becomes much easier. What’s one React concept that changed the way you build apps? 👇

Creating a simple to-do app by integrating HTML, CSS, and JavaScript is a fantastic way to sharpen your front-end development skills. This project demonstrates how combining these core technologies builds a practical, interactive tool that users find valuable. From structuring the HTML to styling with CSS and adding dynamic behavior with JavaScript, it’s a well-rounded challenge for developers at any level. Building such projects not only improves coding proficiency but also encourages best practices like clean code, modular design, and usability enhancements. How have you incorporated mini projects into your learning process? What features would you add to a basic to-do app? Let's share ideas and inspire each other to keep building and improving our coding toolkits. #webdevelopment #javascript #frontend #codingproject #learntocode Check out the actual blog here : https://lnkd.in/gdn5YAXr Note: This post was generated through an AI workflow. If you notice any issues, please contact me.

Ngl, one of the most frustrating parts of starting a new React Native project… is not even building the app 😅 It’s the setup. Every. single. time. You init a new project, and then suddenly: – install navigation – setup API layer (axios, configs, etc.) – configure environment variables – setup custom fonts & app icons – create folder structure – build base components – wire up navigation stacks And before you realize it, you’ve spent days (sometimes weeks) just rebuilding the same foundation… again. It feels repetitive. And honestly, kind of unnecessary. So I thought… why not automate all of this? That’s how RNJet was born 🚀 It’s a production-grade CLI + boilerplate that sets up a fully structured React Native app for you — in minutes. Out of the box, you get: ⚡ Clean & scalable architecture ⚡ TypeScript-first setup ⚡ Preconfigured navigation ⚡ API & storage setup ⚡ Environment configuration ⚡ i18n (internationalization) ⚡ Dark / Light mode ⚡ App icon & basic assets ready Basically everything I always end up rebuilding manually. And the best part? It’s ridiculously simple to use. Just run: 👉 npx @jonathantri/rnjet init Answer a few quick prompts… and your project is ready to go. No more spending 1–2 weeks setting up a base project. Now it takes ~5–10 minutes. If you’ve ever felt the same pain, you might find this useful 👇 🌐 Docs: https://lnkd.in/grPctRrm 📦 NPM: https://lnkd.in/gs3gu8S7 💻 GitHub: https://lnkd.in/gs6ue4hT Would love to hear your thoughts or feedback 🙌 #reactnative #boilerplate #typescript #mobiledevelopment #opensource #developertools #javascript