Building a Responsive Carousel in React with React Responsive Carousel

𝗗𝗮𝘆 𝟭 𝗼𝗳 𝗨𝗻𝗳𝗼𝗹𝗱𝗶𝗻𝗴 𝗧𝗼𝗽 𝟙𝟝 𝗦𝗲𝗰𝗿𝗲𝘁𝘀 𝗔𝗯𝗼𝘂𝘁 𝗥𝗲𝗮𝗰𝘁 Most beginners think React directly works with the browser DOM. But React itself never touches the DOM. React is built around two main parts: 𝗥𝗲𝗮𝗰𝘁 (𝗰𝗼𝗿𝗲 𝗹𝗶𝗯𝗿𝗮𝗿𝘆) – creates a description of the UI 𝗥𝗲𝗻𝗱𝗲𝗿𝗲𝗿 (𝗥𝗲𝗮𝗰𝘁𝗗𝗢𝗠, 𝗥𝗲𝗮𝗰𝘁 𝗡𝗮𝘁𝗶𝘃𝗲, 𝗥𝗲𝗮𝗰𝘁𝗣𝗗𝗙, 𝗲𝘁𝗰.) – turns that description into real output In simple words: When we write a component in JSX, React converts it into a plain JavaScript object using React.createElement(). This object is called a 𝗥𝗲𝗮𝗰𝘁 𝗘𝗹𝗲𝗺𝗲𝗻𝘁. It is just a blueprint of the UI, not the real DOM. Then the renderer takes this blueprint and connects it to the actual platform: ReactDOM renders it to the browser DOM React Native renders it to mobile UI ReactPDF renders it to PDF So the flow looks like this: 𝗖𝗼𝗺𝗽𝗼𝗻𝗲𝗻𝘁(jsx) → 𝗥𝗲𝗮𝗰𝘁 𝗘𝗹𝗲𝗺𝗲𝗻𝘁(js obj) → 𝗥𝗲𝗻𝗱𝗲𝗿𝗲𝗿(html) → 𝗔𝗰𝘁𝘂𝗮𝗹 𝗨𝗜 This separation is why React can work across different platforms with the same core logic. React decides what the UI should look like. The renderer decides how it appears on each platform. Understanding this builds a much stronger foundation in React. #ReactJS #WebDevelopment #Frontend #JavaScript #LearningInPublic #LinkedInLearning #Programming

So, you're working with lists in React and you keep seeing this warning about missing key props - it's frustrating. Keys are essential. They help React figure out what's changed, what's been added, or removed - it's like a name tag for each item. When you're rendering components conditionally, React checks the key prop to decide whether to re-render or re-mount the component - it's a big deal. If the key is different, React will unmount the old component and mount a new one, which can be a good thing, but also a bad thing, depending on the situation. For instance, imagine you have two input components with the same type, but different keys - when you switch between them, React will unmount the old input and mount a new one, because the keys are different, and that can cause some issues if you're not careful. In arrays, keys are crucial - they help React keep track of which items have changed, and if you don't use them, React may render the components in the wrong order, which can be a real problem. So, what's the solution? Use a unique and stable key for each item - it's not that hard. This will help React re-render the components correctly, and you won't have to deal with those annoying warnings anymore. And, just to clarify, the key prop doesn't prevent re-rendering, and it's not a performance optimization - it's more like a way to define the component's identity during reconciliation, so React knows whether a component should be reused or recreated. Check out this article for more info: https://lnkd.in/gwp-PtaB #React #JavaScript #WebDevelopment

So, you're working with lists in React. It's a thing. You've probably seen that warning about missing key props, right? But what's the big deal? Keys are essential - they help React keep track of changes. Think of it like a name tag at a party: it's how React identifies each item in the list. Simple. It's all about identity. Keys don't prevent re-rendering, they just define who's who. For instance, when you're using the same component in a conditional statement, React will update the existing one instead of remounting a new one - unless you add a key prop, that is. Then, React will remount the component when the key changes. It's like a fresh start. You can use keys in arrays, too. It helps React figure out what's changed, what's new, and what's gone. When you add or remove items, React uses the key to decide what to re-render. It's not about performance, though - keys are about identity. Use unique and stable keys, and you'll avoid remounting items unnecessarily. So, to sum it up: keys matter. They're not just some optional thing, they're essential for React to keep track of what's going on. Check out this article for more info: https://lnkd.in/gwp-PtaB #React #JavaScript #WebDevelopment

While starting to learn React, I decided to keep things simple. I built the same Todo List twice with the same UI design: First using pure JavaScript, Then rebuilding it with React. This helped me clearly see the difference between: • JavaScript DOM manipulation • React’s component-based thinking Project features: • Add new tasks • Delete tasks • Toggle task completion • Search tasks • Filter tasks (All / Completed / Not Completed) Small project, but a big learning step for me. Live Demo: JS version: https://lnkd.in/ebWQRNar React version: https://lnkd.in/eJt2Svj7 #React #JavaScript #FrontendDevelopment #WebDevelopment #LearningInPublic #TodoApp

Hello everyone, I’d like to explain two JavaScript concepts—currying and closures—using the dynamic onChange handler in the code snippet below. Here’s a breakdown of how and why it works: 💡 The Concept: Instead of a standard function, we create a function that returns another function. 🧠 What is happening under the hood? 1. Currying (The Setup): We don't pass all arguments (field and e) at once. First, we call handleInputChange('email'). Result: This returns a new function that is sitting there, waiting specifically for the event e. 2. Closure (The Memory): Even after that first function finishes running, the returned function "remembers" the field variable ('email') because of closure. The Payoff: When React finally triggers the onChange event, our inner function executes with access to both the specific field name (saved from the closure) and the event (provided by React). One handler. Infinite inputs. Cleaner code. 🚀 Check out the implementation below. Have you used this pattern in your projects, or do you prefer a different approach? #JavaScript #ReactJS #WebDevelopment #CodingTips #CleanCode

🤯 Do you want a pro React tip? I started naming my useEffect functions, and its beautiful 👇 React code is full of hooks noise like useState, useEffect, useRef, and useMemo everywhere. It's hard to quickly scan a file and understand what's actually happening because the lifecycle stuff dominates everything. I started using named functions instead of arrow functions for my effects, and it made a massive difference. Here's why: 1️⃣ Cuts through the noise — When you have multiple useEffects in a component, descriptive names like synchronizeMapZoomLevel or fetchUserData let you scan the file and immediately understand the flow without reading implementation details. 2️⃣ Stack traces — If something breaks, the function name shows up in the error stack. Way easier to debug than an anonymous function at line 47. 3️⃣ Forces single responsibility — When you try to name an effect and struggle? That's usually because it's trying to do too many things. It naturally pushes you to split things up or remove them altogether (You might not need an effect) Some people prefer to extract everything into custom hooks immediately, which is great too. But this works really well for simpler cases where a full hook feels like overkill. Have you tried this? Or do you go straight to custom hooks for everything? #React #JavaScript #WebDev #CleanCode

React: useState vs useRef — Which one should you use for forms? While building forms in React, most of us instinctively reach for useState to handle input values. But have you ever stopped and asked — Do I really need state here? Let’s break it down. ❌ Problem with useState in such cases When you store every input value in state: Every keystroke updates state Every state update triggers a re-render Your component keeps re-rendering unnecessarily This can impact performance, especially in large forms or complex components Many times, we are not even using these values to update the UI — we just need them when the user clicks “Submit” to make an API call. In such cases, using useState is actually overkill. ✅ Better approach: useRef Instead of tracking input values in state, we can use useRef to store references to input fields. Why is this better? ✔ No unnecessary re-renders ✔ You can directly access current input values when needed ✔ Ideal when input values are only required for form submission ✔ Keeps your component lightweight and efficient In my example, I used useRef to store references to multiple input fields and accessed their values only when submitting the form. 🎯 Key takeaway 👉 If your input values are only needed for an API call and not for rendering UI, prefer useRef over useState. State is powerful — but using it everywhere is not always the best choice. Would love to hear your thoughts — how do you handle forms in React? git repo: https://lnkd.in/d_S5AJCa #React #useState #useRef #FrontendDevelopment #JavaScript #WebPerformance #ReactHooks #WebDev

So you wanna build a command menu in React. It's a great idea - and cmdk is a fantastic tool to help you do just that. This thing is fast, unstyled, and provides a composable API for building command palettes, search interfaces, and accessible comboboxes. It's simple. To get started, you'll need a few things: Node.js version or higher, a package manager like npm, yarn, or pnpm, a React project (version 17 or higher), and some basic knowledge of React hooks and JavaScript/TypeScript. Now, let's talk installation - you can use your preferred package manager to install cmdk. For instance, you can use npm by running `npm install cmdk`, or yarn with `yarn add cmdk`, or even pnpm with `pnpm add cmdk`. Easy peasy. cmdk provides several components that make building command menus a breeze: Command, Command.Input, Command.List, Command.Item, Command.Group, and Command.Empty. You can use these components to create a simple command menu, and even add custom styling and keyboard shortcuts to make it more user-friendly. For example, imagine creating a command palette with keyboard shortcuts and actions - it's totally doable with cmdk. You can use the Command component to render a list of commands, and the Command.Input component to handle search input. And, with various props and callbacks, you can customize the appearance and behavior of the command menu to fit your needs. Like, have you ever thought about using the onValueChange prop to handle changes to the search input, or the onSelect prop to handle selection of a command item? It's a game-changer. Check out this resource for more info: https://lnkd.in/geea7KBr #React #cmdk #CommandMenus #Innovation #Creativity #Strategy

🧠 How JSX Really Works Behind the Scenes in React When I started working with React, JSX looked just like HTML to me. But the browser actually doesn’t understand JSX at all. So what really happens behind the scenes? 👇 🔹 JSX is not HTML JSX is just a syntax that makes React code easier to read and write. At the end of the day, it’s still JavaScript. 🔹 Babel converts JSX into JavaScript For example, this JSX: <h1>Hello World</h1> is converted into: React.createElement("h1", null, "Hello World") 🔹 React.createElement returns a JavaScript object This object represents a Virtual DOM node, not the real DOM. 🔹 Virtual DOM and Reconciliation React compares the new Virtual DOM with the previous one and figures out what actually changed. 🔹 Only necessary DOM updates happen Instead of reloading everything, React updates only what’s needed. That’s a big reason why React apps feel fast and smooth. 💡 Understanding this helped me: • Debug React issues more easily • Write cleaner and more optimized components • Feel more confident in machine & technical rounds React looks simple on the surface, but there’s a lot of smart work happening under the hood 🚀 #ReactJS #JavaScript #FrontendDevelopment #JSX #WebDevelopment #LearningReact #ReactTips

Stop writing e.preventDefault() in React ⚛️ 👇 . For a decade, "The React Way" to build a form was verbose. You needed useState for every input. You needed onChange handlers for every keystroke. You needed to manually prevent the browser refresh. It turned simple HTML forms into complex state management problems. React 19 brings back the power of HTML with Actions. ❌ The Old Way (Controlled): Micro-managing the value of every input. If you had 10 inputs, you had 10 state variables (or one giant object) and a massive onSubmit handler. ✅ The Modern Way (Actions): Pass a function to the action prop of your <form>. React automatically captures the submission. • No State: Read values directly from FormData in your action. • No Handlers: Delete your onChange props. • Progressive: Works even before JavaScript loads (if using Server Actions). The Shift: We are moving from "managing inputs" to "handling submissions." Note: You can still use controlled inputs if you need instant validation (like password strength), but for submission, they are no longer required. #ReactJS #React19 #WebDevelopment #Frontend #JavaScript #CleanCode #SoftwareEngineering #TechTips #ReactHooks #Hooks #ReactTips #FrontrendDeveloper #DevloperTips