What Happens to Script Loading When You Use React.js? ⚛️ When working with React, developers rarely think about <script> placement — yet the browser rules still apply. The difference is that modern React tooling handles it for you. Here’s what actually happens behind the scenes 👇 📌 React apps use JavaScript modules Most React projects (Vite, CRA, Webpack) load the entry file like this: <script type="module" src="/src/main.jsx"></script> 🔑 Key detail: Scripts with type="module" behave like defer by default. ⚙️ Browser behavior HTML is parsed normally React bundle is downloaded in parallel Script executes after the DOM is fully parsed React safely mounts to #root ✅ DOM is ready ✅ No blocking ✅ Correct execution order 🚫 Why async is NOT used for React bundles async executes as soon as the file loads DOM may not be ready Execution order is not guaranteed Using async for the main React bundle can break the app. 👉 async is best reserved for analytics, ads, and tracking scripts 🧠 Best practices in React Let the bundler manage script loading Rely on type="module" or defer Never use async for the main React entry file ✅ Key takeaway React works smoothly because its entry script is deferred by design, ensuring the DOM is ready before execution. Understanding this helps with performance optimization, debugging, and interviews 🚀 #ReactJS #JavaScript #FrontendDevelopment #WebPerformance #HTML #Defer #Async #WebEngineering
React Script Loading: Understanding Browser Behavior and Best Practices
More Relevant Posts
-
So you wanna dive into React development. It's a game changer. React Hooks are a new way to write components - and they're pretty cool. They let you use state and other features without writing class components, which can be a real pain. Here's the thing: Hooks are functions that let you tap into React's power from functional components. They make your code way more readable, and easier to maintain - which is a huge plus. You can use Hooks like useState and useEffect to add state and perform side effects, like fetching data from an API. For example, you can create a simple counter with a button - when you click it, the count updates. It's like a light switch, you flip it and something happens. The useEffect hook is like a messenger, it lets you perform side effects, like fetching user data and updating the component. Using Hooks has some serious benefits: your code is simpler, your logic is reusable, and your organization is on point. But, there are some rules to keep in mind - always call Hooks at the top level of your component, only call them from React functions, and start with built-in hooks before creating custom ones. React Hooks make development more intuitive, it's like having a superpower. Start with useState and useEffect, and then explore other hooks - like a treasure hunt. So, what's your experience with React Hooks? Share your thoughts, let's get a conversation going. https://lnkd.in/gwcTEGSE #ReactHooks #JavaScript #WebDevelopment
To view or add a comment, sign in
-
React Custom Hooks – Counters & TodoList Project I’m excited to share my React Custom Hooks learning project, where I practiced building reusable and scalable logic using custom hooks in React. Custom Counter Hook Implemented a single counter hook and reused it in two different counter components Each counter receives a different initial value / step (e.g., 5 and 10) Demonstrates how custom hooks accept parameters to make logic flexible and reusable Avoids code duplication while handling increment and decrement logic Custom TodoList Hook Built a TodoList custom hook to manage todo state and actions Implemented: Add Todo Delete Todo Logic is completely separated from UI components Same hook can be reused in multiple TodoList components Purpose of Using Custom Hooks To separate business logic from UI To improve code reusability To make components clean and easy to maintain To write interview-ready React code Tech Stack: React.js JavaScript Custom Hooks (useState) Bootstrap for UI styling Key Learnings: Creating and using parameterized custom hooks Managing state effectively with hooks Reusing logic across multiple components Writing clean, modular React code 🔗 GitHub Repository: https://lnkd.in/gdtEAvSn This project helped me strengthen my fundamentals in React Hooks and Custom Hooks, preparing me for real-world React development. #ReactJS #CustomHooks #ReactHooks #JavaScript #FrontendDevelopment
To view or add a comment, sign in
-
🚀 React Custom Hooks Project Custom Counter Hook Implemented a reusable counter hook used in two different counter components. Each counter has a different initial value and step (e.g., 5 and 10). Shows how custom hooks accept parameters to make logic flexible and reusable. Avoids code duplication while handling increment & decrement logic efficiently. Custom TodoList Hook Built a TodoList custom hook to manage todo state and actions. Features include: Add Todo Delete Todo Logic is completely separated from UI components. The same hook can be reused in multiple TodoList components. Why Custom Hooks? To separate business logic from UI To improve code reusability To make components clean & easy to maintain Tech Stack: React.js | JavaScript | Custom Hooks (useState) | Bootstrap for UI Key Learnings: Creating and using parameterized custom hooks Managing state effectively with hooks Reusing logic across multiple components Writing clean, modular React code 🔗 GitHub Repository: https://lnkd.in/gBinYFU4 This project strengthened my fundamentals in React Hooks and Custom Hooks, preparing me for real-world React development. #ReactJS #CustomHooks #ReactHooks #JavaScript #FrontendDevelopment
To view or add a comment, sign in
-
React is more than a library — it’s a way of thinking. It helps frontend developers build scalable, component-based user interfaces that are fast, maintainable, and easy to extend. Modern frontend development with React usually includes tools like: • JavaScript (ES6+) & TypeScript • React Hooks & Context API • Next.js for performance and SEO • Tailwind CSS / Styled-Components / MUI for styling • Redux / Zustand for state management • Axios / Fetch API for handling APIs • Vite / Webpack for bundling • Git & GitHub for version control • Jest / React Testing Library for testing React teaches you how to break problems into components, manage state efficiently, and build real-world applications. The goal isn’t to know every tool — the goal is to understand when and why to use each one. — Amir Aboshama #AmirAboshama #ReactJS #FrontendTools #FrontendDevelopment #WebDevelopment #JavaScript #TypeScript #NextJS #Redux #TailwindCSS #SoftwareEngineering #Developers #TechJourney
To view or add a comment, sign in
-
-
If you're using Tailwind in modern React / Next.js projects, v4 brings some powerful improvements here is the--------- Key Differences: Performance v3- JavaScript engine v4- New Rust-based engine (much faster builds & HMR) Configuration v3- Config mostly in tailwind.config.js v4- CSS-first config using @theme (more natural styling workflow) Content Detection v3- Manual file paths in content v4- Automatic scanning (less setup headaches) Modern CSS Support v4 adds better support for: Container queries CSS variables color-mix() Modern gradients & transforms Browser Target v3- Wider legacy browser support v4-Optimized for modern browsers (smaller & faster builds) Bottom line: Tailwind v4 improves developer experience, build speed, and future-proofs UI development. If you're starting a new project — v4 is worth trying 🚀 #TailwindCSS #FrontendDevelopment #React #NextJS #WebDev #CSS #Developer #LearningInPublic
To view or add a comment, sign in
-
-
So you wanna build a responsive carousel in React - it's a game changer. Simple, really: you just need a few basics to get started. Node.js version 14.0 or higher, check. A package manager like npm, yarn, or pnpm, got it. A React project, preferably version 17 or higher, and some basic knowledge of React components - you know, the usual suspects. Oh, and familiarity with JavaScript or TypeScript doesn't hurt either. Now, let's talk installation - it's a breeze. Just use your preferred package manager to install React Responsive Carousel: npm install react-responsive-carousel, yarn add react-responsive-carousel, or pnpm add react-responsive-carousel. Easy peasy. After that, import the CSS file in your main entry file, and you're good to go. Creating a simple image carousel is a walk in the park - just import the Carousel component and use it in your JSX file. It's fast. React Responsive Carousel has some amazing features, like automatic responsiveness, navigation arrows, indicators, touch support, and legend support - all the bells and whistles. But here's the thing: you can customize your carousel to fit your needs. Use props like showArrows, showIndicators, and autoPlay to make it your own. It's like building with Legos - the possibilities are endless. For more info, check out the official repository: https://lnkd.in/gV2JfYru Source: https://lnkd.in/ge4Zrn6M #React #ResponsiveCarousel #JavaScript
To view or add a comment, sign in
-
🔹 Understanding useReducer in React / React Native When state logic becomes complex, useReducer helps keep your code clean, predictable, and scalable. ✅ Key useReducer Concepts (with examples) 🔹 useReducer useReducer(reducer, initialState) → Hook used to manage complex state logic 🔹 state const [state, dispatch] = useReducer(...) → Holds the current state value 🔹 dispatch dispatch({ type: 'ADD_TODO', payload: 'Buy milk' }) → Function that sends actions to the reducer 🔹 action { type: 'ADD_TODO', payload: 'Buy milk' } → Object describing what happened 🔹 type 'ADD_TODO' → Identifies which action should be performed 🔹 payload 'Buy milk' → Data required to update the state 🔹 reducer (state, action) => newState → Pure function that decides how state changes 🔹 initialState [] or {} → Starting value of the state 🔹 immutability return [...state, newItem] → State should never be mutated directly 🧠 Simple Flow to Remember UI → dispatch → action → reducer → new state → UI update 🎯 When to use useReducer? ✔ Multiple state actions ✔ Complex update logic ✔ Better readability & scalability ✔ Redux-like pattern inside components 💡 Tip: If useState starts feeling messy, it’s time to switch to useReducer. #ReactNative #MobileDevelopment #JavaScript #CodeHumor #DeveloperLife #YagnikRavrani
To view or add a comment, sign in
-
-
React can be a game-changer. It's all about building software that's easy to maintain and a breeze to work with. But let's be real - sometimes React code can start to look like it's been hijacked by jQuery. Not good. It's a problem. When you're dealing with big chunks of code that are trying to do too much, like fetching data, updating the UI, and managing events all at once, that's a red flag. And don't even get me started on using `useEffect` for everything under the sun - it's like trying to force a square peg into a round hole. Then there's the issue of directly manipulating the DOM, which is just a recipe for disaster. And have you ever found yourself not splitting components by responsibility, or using CSS class names to store UI state? Yeah, those are major no-nos. So, what's the solution? Well, for starters, split those components into smaller, more manageable ones - it's like breaking down a big project into smaller tasks, you know? Use custom hooks for logic, and avoid direct DOM manipulation like the plague. Keep your UI state in React state or a store, and use `useEffect` for focused tasks, not as a catch-all. It's time to take a step back. React gives you the freedom to build amazing things, but with that freedom comes a ton of responsibility - it's like having a superpower, you've got to use it wisely. Source: https://lnkd.in/gA254jbm #React #JavaScript #SoftwareDevelopment #CodeQuality #WebDevelopment
To view or add a comment, sign in
-
⚛️ What Is a Custom Hook in React & When Should You Create One? As your React app grows, you’ll often notice the same logic repeated across components. That’s where Custom Hooks shine ✨ 🔍 What Is a Custom Hook? A custom hook is a reusable JavaScript function that: Starts with use Uses one or more React hooks internally Encapsulates stateful logic, not UI function useCounter() { const [count, setCount] = React.useState(0); const increment = () => setCount(c => c + 1); const decrement = () => setCount(c => c - 1); return { count, increment, decrement }; } Now this logic can be reused in any component. 🧠 Why Use Custom Hooks? ✅ Avoid duplicated logic ✅ Keep components clean & readable ✅ Improve reusability ✅ Easier testing & maintenance ✅ Better separation of concerns Your components focus on UI, hooks focus on logic. ⏱ When Should You Create a Custom Hook? Create a custom hook when: ✔ Same logic is used in multiple components ✔ You’re managing complex state logic ✔ You want to abstract side effects (useEffect) ✔ You’re handling API calls, auth, forms, or subscriptions ❌ Don’t create one for single-use, trivial logic 🔥 Common Use Cases useFetch() – API calls useAuth() – authentication logic useDebounce() – performance optimization useLocalStorage() – persistent state useTheme() – global UI behavior 🎯 In Short Custom Hooks = Reusable logic + Cleaner components They are one of the most powerful patterns in modern React. If you’re not using them yet — you’re missing out 🚀 #ReactJS #CustomHooks #ReactHooks #JavaScript #FrontendDevelopment #WebDevelopment #CleanCode #ReactPatterns #FrontendDeveloper #CodingTips #TechLearning #InterviewPrep #100DaysOfCode
To view or add a comment, sign in
-
-
🚰 Hydration in React & Next.js — explained like a senior dev Most people say “Hydration connects HTML with JavaScript” That’s technically correct… and practically useless. So let’s say it properly 👇 🧠 What is Hydration? When the server sends HTML to the browser, the page looks ready But it’s actually dead — no clicks, no state, no logic. Hydration is the moment React attaches JavaScript to that HTML and brings it to life. HTML → visible Hydration → interactive ⚡ Why is Hydration REQUIRED? ✅ SEO Search engines need real HTML, not empty <div id="root"></div> ✅ Fast First Paint Users see content instantly (before JS loads) ✅ Interactivity Buttons click. Forms submit. State updates. ✅ Hybrid Apps (SSR + SPA) Hydration is the bridge between server-rendered HTML and client-side navigation 🔁 What actually happens? 1️⃣ Server renders HTML 2️⃣ Browser paints it instantly 3️⃣ JS loads in parallel 4️⃣ React hydrates the page 5️⃣ Event listeners attach 6️⃣ App becomes fully interactive No hydration = pretty but useless UI. ⚠️ One hard truth Hydration is not free. Big JS bundles + too many client components = slow hydration. That’s why modern frameworks push: Server Components Partial hydration Streaming rendering Performance today is about reducing hydration cost, not ignoring it. #ReactJS #NextJS #WebPerformance #FrontendEngineering #SSR #Hydration #JavaScript #SoftwareEngineering #5/NEXTJS
To view or add a comment, sign in
-
Explore content categories
- Career
- Productivity
- Finance
- Soft Skills & Emotional Intelligence
- Project Management
- Education
- Technology
- Leadership
- Ecommerce
- User Experience
- Recruitment & HR
- Customer Experience
- Real Estate
- Marketing
- Sales
- Retail & Merchandising
- Science
- Supply Chain Management
- Future Of Work
- Consulting
- Writing
- Economics
- Artificial Intelligence
- Employee Experience
- Workplace Trends
- Fundraising
- Networking
- Corporate Social Responsibility
- Negotiation
- Communication
- Engineering
- Hospitality & Tourism
- Business Strategy
- Change Management
- Organizational Culture
- Design
- Innovation
- Event Planning
- Training & Development