React Component Lifecycle with Hooks Explained

React Learning Series | Day 8 – Understanding PropTypes ->In React, PropTypes are used to validate the type of props passed to a component. ->They help developers ensure that components receive the correct type of data, reducing bugs during development. ->PropTypes act as a type-checking mechanism for React components. Example: import PropTypes from "prop-types"; function User({ name, age }) { return ( <h2> {name} is {age} years old </h2> ); } User.propTypes = { name: PropTypes.string, age: PropTypes.number, }; Explanation: --PropTypes.string ensures the value must be a string --PropTypes.number ensures the value must be a number --If incorrect data is passed, React shows a warning during development Why PropTypes matter: ✔ Helps detect errors early ✔ Improves component reliability ✔ Makes code easier to understand --->PropTypes help build safer and more predictable React components. 📌 Day 8 of my React Learning Series #ReactJS #ReactDeveloper #FrontendDevelopment #WebDevelopment #JavaScript #CodingJourney #LearningInPublic #DeveloperJourney #TechLearning #LinkedInSeries 🚀

Most React tutorials teach syntax. useState here, useEffect there, props go down. What they don't teach is why React behaves the way it does. One idea fixes most of the confusion UI = function of state What's on screen is whatever your state says it should be. React doesn't manually update the DOM — it re-runs your component function on every state change and calculates what changed. Everything else follows from this. ⚠️ Why direct mutation does nothing user .name = "Harshal" // React doesn't see this React compares object references. Same reference, no re-render — doesn't matter what changed inside the object. setUser({ ...user, name: "Harshal" }) // new reference, React notices ⬇️ Why props only go downward Parent runs, passes data to children. Children can't push anything back up without a callback from the parent. The one-way flow isn't a limitation — it's what makes the data readable. 🔄 Why useEffect runs after the render React paints the screen first. Then effects run. Effects sync with the outside world — APIs, timers, subscriptions. If they ran before the paint, every render would wait on them. That's why the order is fixed. 🕳️ Why stale closures catch you off guard Your component captures state at the moment it runs. If state updates before a handler fires, the handler still holds the old value. That's just JavaScript closures working normally inside a re-render. Fix: put the value in the dependency array, or use a ref. #ReactJS #Frontend #JavaScript #WebDevelopment #FrontendDevelopment #ReactTips #SoftwareEngineering #DevCommunity

Day 1 of learning React Today marks the beginning of my journey into React, and I’m excited to share what I’ve learned so far. I started by understanding how to set up React using external libraries and how Babel plays an important role. Since browsers don’t understand JSX directly, Babel compiles it into regular JavaScript that the browser can execute. One thing I’ve realized already is that React makes building user interfaces more structured and scalable. Instead of writing plain JavaScript, we use JSX a syntax that looks like HTML but works inside JavaScript. Here are a few core concepts I explored today: • Components Components are like reusable building blocks for your UI. Instead of writing one large file, you break your interface into smaller, manageable pieces. Example: function Welcome() { return Hello, World!; } • Fragments Sometimes you want to return multiple elements without adding unnecessary divs to your HTML. That’s where fragments come in. Example: <> • Props Props (short for properties) allow you to pass data from one component to another, making your components dynamic. Example: function Welcome(props) { return Hello, {props.name}; } • Conditional Rendering (Guard Operator) In React, we can use the “&&” operator directly inside JSX to render something based on a condition. Example: {isLoggedIn && Welcome back!} This will only display the message if isLoggedIn is true. It hasn’t been easy stepping into something new, but I’m committed to learning and improving every day. #React #JavaScript #FrontendDevelopment #WebDevelopment #LearningInPublic #CodingJourney #100DaysOfCode #BuildInPublic

🚀 React Hooks — Complete Guide (Made Simple) If you’re learning React, you’ve probably heard this advice: 👉 “Master Hooks, and everything becomes easier.” And it’s true. Because Hooks are not just features… they’re the foundation of modern React development. ⸻ 💡 Why Hooks matter: Before Hooks, React development often felt messy: • Class components everywhere • Lifecycle methods hard to manage • Logic scattered and difficult to reuse Now with Hooks 👇 ✔ Cleaner functional components ✔ Reusable and modular logic ✔ Better readability and scalability ⸻ 🧠 Quick breakdown of essential Hooks: 🔹 useState — Manage component state 🔹 useEffect — Handle side effects (API calls, lifecycle) 🔹 useContext — Share global data easily 🔹 useRef — Access DOM & persist values 🔹 useMemo — Optimize expensive calculations 🔹 useCallback — Memoize functions 🔹 Custom Hooks — Reuse logic across components ⸻ ⚡ The real shift: Hooks change how you think. From: ❌ “How do I manage lifecycle?” To: ✅ “How do I structure logic cleanly?” ⸻ 🔥 Pro tip: Don’t just memorize Hooks. 👉 Build projects 👉 Break things 👉 Understand why each Hook exists That’s where real learning happens. ⸻ 💬 Question: Which Hook do you find most confusing (or most useful)? ⸻ 📌 Save this post — it’s a quick reference you’ll keep coming back to. #ReactJS #FrontendDevelopment #WebDevelopment #JavaScript #Coding #Programming #Developers #SoftwareEngineering #ReactHooks #LearnToCode #TechCommunity #BuildInPublic #UIUX #CareerGrowth

🚀 Day 16 of My JavaScript Journey Today was a powerful learning day 💻🔥 I explored some core JavaScript concepts that are extremely important for real-world applications. ✨ Topics I Covered: 🔹 Synchronous vs Asynchronous code 🔹 How the JavaScript Event Loop works 🔁 🔹 Why Callback Hell is a problem 😵 🔹 Creating Promises using "resolve" and "reject" 🤝 🔹 ".then()", ".catch()", ".finally()" methods 🔹 Sequential vs Parallel Promise execution ⚡ 🔹 Comparison of Promise utility methods 🔹 Real-world example: Food Delivery App (Zomato Clone 🍔) 🔹 API fetching using Promises 🌐 🔹 Error handling patterns 🚨 💡 Key Learning: Understanding asynchronous JavaScript is a game-changer 💯 Concepts like the Event Loop and Promises help write cleaner, more efficient, and scalable code. 🍽️ The food delivery app example helped me understand how multiple tasks like ordering, payment, and delivery can run efficiently using async concepts. 🔥 Growing step by step every day! Consistency is the key 🔑 #JavaScript #WebDevelopment #CodingJourney #DaysOfCode #AsyncJS #Promises #Learning #DeveloperLife

Common React Events Every Developer Should Know If you're learning React, understanding event handling is essential for building interactive user interfaces. Here are some of the most commonly used React events and when to use them. 1. onClick: Triggered when a user clicks an element. Commonly used for buttons, menus, and triggering actions. 2. onChange: Fires when the value of an input field changes. Mostly used in forms to capture user input. 3. onFocus: Occurs when an input field becomes active. Helpful for highlighting fields or showing hints. 4. onBlur: Happens when an input field loses focus. Often used for validation after the user leaves a field. 5. onMouseOver: Executes when the mouse moves over an element. Useful for hover effects, tooltips, or previews. 6. onMouseOut Triggered when the mouse leaves an element. Commonly paired with hover interactions. 7. onSubmit Invoked when a form is submitted. Used to handle form data before sending it to a server. 8. onKeyDown: Triggered when a keyboard key is pressed down. Useful for shortcuts or detecting specific keys. 9. onKeyUp: Fires when a keyboard key is released. Often used for live search or input validation. Why these events matter: React events allow developers to create dynamic and responsive applications by responding to user actions in real time. If you're learning React, mastering these events will make your UI much more interactive and user-friendly. #React #WebDevelopment #FrontendDevelopment #JavaScript #Coding #ReactJS #Programming

Most tutorials teach you what to build. Today I finally understood how things actually work under the hood. Day 4 of my React learning journey 🚀 Here’s what I worked on: • Built Create & Read functionality from scratch • Split logic into two separate components (cleaner + reusable) • Learned how to use React Hook Form • Understood how forms are managed efficiently using hooks Key insight: Handling forms in React doesn’t have to be messy. With the right approach (and tools like React Hook Form), you stop fighting state management… and start controlling it. Real moment: At first, managing inputs and state felt confusing — too many moving parts. But once I connected how hooks simplify the flow, everything started making sense. That shift from confusion → clarity was the real win today. Still early in the journey, but now I can see how real-world apps handle user data step by step. Building slowly. Understanding deeply. Devendra Dhote Sheryians Coding School #ReactJS #WebDevelopment #JavaScript #LearningInPublic #FrontendDev

React becomes much cleaner when you understand destructuring. One of the most useful JavaScript features in React is destructuring. It helps you pull values out of props, state, and objects in a cleaner and more readable way. Instead of writing: const name = props.name; const age = props.age; you can write: const { name, age } = props; Even better, directly in a component: function Profile({ name, age }) { return <p>{name} is {age} years old.</p>; } You’ll also see destructuring in useState all the time: const [count, setCount] = useState(0); Here: count = current state value setCount = function to update it Why this matters in React: cleaner code better readability fewer repeated references like props. or user. easier component maintenance Destructuring is small, but it makes a big difference in writing modern React code. If you're learning React, master this early — you'll use it in almost every component. What’s one React feature that felt confusing at first but now feels essential? #React #JavaScript #FrontendDevelopment #WebDevelopment #ReactJS #Coding #SoftwareDevelopment #100DaysOfCode #Programming #LearnToCode

🚀 Understanding Hooks in React (Simple Explanation) When I first started learning React, I thought state management was only possible with class components… but then I discovered Hooks — and everything changed. 👉 Hooks are special functions in React that allow functional components to use features like state and lifecycle methods. 💡 Example: With useState, we can easily manage state inside a function component — no need for classes anymore. Why Hooks are powerful: ✔ Cleaner and more readable code ✔ Reusable logic across components ✔ Less boilerplate compared to class components ✔ Makes development faster and more scalable Some commonly used Hooks: 🔹 useState – manage state 🔹 useEffect – handle side effects (API calls, timers) 🔹 useRef – access DOM elements 🔥 One simple line: Hooks = extra powers for functional components. Learning Hooks really changed how I write React code — and made development feel much more intuitive. #ReactJS #WebDevelopment #Frontend #JavaScript #LearningInPublic #Developers

I started learning React. And I already made a decision most beginners don't make until month 3. I'm not going to wait until I "know enough" to build something. I'm going to build while I learn. Here's my thinking 👇 Every React resource says: "Learn the fundamentals first." But no one tells you when "enough fundamentals" actually is. So beginners keep watching. Keep taking notes. Keep waiting for the perfect moment to start building. That moment never comes. The only way to make things click: → Components make sense when you're building real sections → Props make sense when you're passing your own data → State makes sense when you see it change on screen → Hooks make sense when they solve your actual problem Theory without application just fades. So starting today — I'm learning React by building my portfolio. Not a tutorial clone. My own thing. It'll be messy. That's fine. Messy and real beats clean and imaginary. If you're also learning React (or any framework): What's the first real thing you built? I'd love to know. #ReactJS #JavaScript #LearningInPublic #BuildInPublic #WebDevelopment #FrontendDevelopment #LearnToCode #CodingJourney