Sasikumar S’ Post

🚀 Traversing the DOM with Node Relationships (JavaScript) Navigating the DOM efficiently relies on understanding node relationships. Properties such as `parentNode`, `childNodes`, `firstChild`, `lastChild`, `nextSibling`, and `previousSibling` allow you to traverse the DOM tree. Using these relationships, you can locate and manipulate specific elements relative to other elements. Understanding these relationships is crucial for tasks like dynamically updating lists, navigating tables, or modifying the structure of complex web pages. Always check for `null` when traversing to avoid errors. 👉Download our app to access 10,000+ concise concepts, 60+ subjects and 4,000+ articles — explore now. 📱App : https://lnkd.in/gefySfsc 🌐 Visit our website for more resources. 🌐 Website : https://lnkd.in/guvceGZ3 👉 Learn smarter — 10,000+ concise concepts, 4,000+ articles, and 12,000+ topic-wise quiz questions, personalized by AI. Dive in now! 📱 Get the app: https://lnkd.in/gefySfsc 🌐 Explore more on our website. 🌐 Website : https://lnkd.in/guvceGZ3 #JavaScript #WebDev #Frontend #JS #professional #career #development

⚙️ SK – Debounce & Throttle: Master Performance Optimization in JS 💡 Explanation (Clear + Concise) Both debounce and throttle help you control how often a function executes — reducing unnecessary re-renders or API calls in React apps. 🧩 Real-World Example (Code Snippet) // 🕒 Debounce – Trigger only after delay ends function debounce(fn, delay) { let timeout; return (...args) => { clearTimeout(timeout); timeout = setTimeout(() => fn(...args), delay); }; } // ⚡ Throttle – Trigger once every delay interval function throttle(fn, delay) { let lastCall = 0; return (...args) => { const now = Date.now(); if (now - lastCall >= delay) { fn(...args); lastCall = now; } }; } // 🧠 Usage Example window.addEventListener("resize", debounce(() => console.log("Resized!"), 500)); window.addEventListener("scroll", throttle(() => console.log("Scrolling!"), 1000)); ✅ Why It Matters in React: Debounce user input (search boxes). Throttle scroll events for better performance. Improves UX by avoiding redundant operations. 💬 Question: Where do you think debounce helps more — API calls or form validations? 📌 Follow Sasikumar S for more daily dev reflections, real-world coding insights & React mastery. 🤝 Connect Now: sasiias2024@gmail.com 💟 Visit: sk-techland.web.app ❤️ Follow our LinkedIn Page for more React & JavaScript growth tips. #JavaScript #ReactJS #Performance #Debounce #Throttle #FrontendOptimization #WebDevelopment #CodingJourney #TechLearning

Day 3 — Reconciliation and diffing algorithm Understanding JSX in React.js Reconciliation is the process by which React updates the DOM when your app’s data changes. React doesn’t rebuild the entire webpage — instead, it: 1️⃣ Creates a new Virtual DOM copy. 2️⃣ Compares it with the previous Virtual DOM. 3️⃣ Updates only the parts that actually changed in the Real DOM. ✅ Goal: To make UI updates fast, efficient, and smooth. ⚙️ How It Works (Step-by-Step) 1️⃣ You update a component’s state or props. 2️⃣ React re-renders the Virtual DOM for that component. 3️⃣ React compares the new Virtual DOM with the previous one using the Diffing Algorithm. 4️⃣ Only the changed parts are updated in the Real DOM. 🧠 What is the Diffing Algorithm? The Diffing Algorithm is React’s smart method to detect changes between two Virtual DOMs efficiently. React assumes: Elements with different types (like <div> → <p>) are completely different → replace the whole node. Elements with the same type (like <div> → <div>) → only update changed attributes or children. Keys help React identify which elements changed, added, or removed in lists. What is JSX? JSX (JavaScript XML) is a syntax extension for JavaScript used in React. It allows us to write HTML-like code inside JavaScript — making UI creation simple and readable. Why We Use JSX 1️⃣ Cleaner Code: Easier to read and write than React.createElement() 2️⃣ Dynamic UI: You can use JS expressions directly inside JSX 3️⃣ Component Friendly: JSX makes building reusable UI components simpler #React #ReactJS #LearnReact #ReactDeveloper #ReactLearning #ReactJourney #ReactSeries #ReactTips #ReactBeginners #ReactForBeginners #ReactCommunity

⚙️ export default vs. export: Which One Should You Use? If you’ve written JavaScript or React for a while, you’ve probably found yourself wondering: “Should I use export default or a named export here?” Let’s break down how they differ and when to use each 👇 🔹 export default This is used when your file is intended to export a single main value, such as a function, class, or component. export default function Button() { return <button>Click</button>; } Importing: import Button from "./Button"; ✅ Best for: React components (like App, Navbar, Footer) Utility functions that stand alone (e.g., formatDate) Files where only one thing matters ⚠️ Keep in mind: Only one default export per file The imported name can be changed freely, which sometimes reduces clarity across teams 🔹 Named export Used when you want to export multiple values from the same file. export const add = (a, b) => a + b; export const subtract = (a, b) => a - b; Importing: import { add, subtract } from "./math"; ✅ Best for: Utility or helper modules Config files, constants, hooks When you want explicit, consistent naming and better auto-complete support 💡 Rule of Thumb Use export default when your file has one clear purpose Use named exports when your file exposes multiple functionalities Maintaining this distinction helps ensure code clarity, reusability, and consistency — especially in large MERN projects where collaboration is crucial. 🚀 Final Thought Both are powerful, but knowing when to use each keeps your codebase predictable, organized, and developer-friendly. Default = one main thing. Named = many clear things. Simple rule, cleaner code. ✨ 💬 Which one do you prefer in your projects, default or named exports? #JavaScript #React #MERN #WebDevelopment #CleanCode #Frontend

🚀 Template Literals (JavaScript) Template literals provide a way to embed expressions within strings, making string concatenation more readable and powerful. They are enclosed in backticks (`) instead of single or double quotes. You can use placeholders `${expression}` to insert variables or expressions directly into the string. Template literals also support multiline strings without the need for escape characters, simplifying the creation of complex strings. 👉Download our app to access 10,000+ concise concepts, 60+ subjects and 4,000+ articles — explore now. 📱App : https://lnkd.in/gefySfsc 🌐 Visit our website for more resources. 🌐 Website : https://lnkd.in/guvceGZ3 👉 Learn smarter — 10,000+ concise concepts, 4,000+ articles, and 12,000+ topic-wise quiz questions, personalized by AI. Dive in now! 📱 Get the app: https://lnkd.in/gefySfsc 🌐 Explore more on our website. 🌐 Website : https://lnkd.in/guvceGZ3 #JavaScript #WebDev #Frontend #JS #professional #career #development

🗓️ SK - 3 – React Hooks (Deep Dive) 🪝 🎯 Goal: Master React Hooks — the heart of modern React development. 🧠 Core Topics ✅ useState, useEffect, useContext, useReducer ✅ useMemo, useCallback, useRef ✅ Custom Hooks for reusability 💻 Coding Practice ⚙️ Create a custom hook for fetching data from an API. ⚙️ Use useMemo and useCallback to optimize renders. ⚙️ Build a stopwatch using useRef. 🎥 Learning Resources 🔗 React Hooks Tutorial – Net Ninja 🔗 useEffect Deep Dive – Codevolution 💬 Mock Interview Prep ❓ When does useEffect run? ❓ What’s the difference between useMemo and useCallback? ❓ How do you share logic between components using custom hooks? 🌟 Reflection: Hooks aren’t just syntax — they’re a paradigm shift. They make React code more readable, modular, and powerful. Every time you replace a class lifecycle with a clean useEffect, you write smarter code. ⚙️ Mastering Hooks = mastering React’s functional mindset. Write less. Do more. Think declaratively. 💡 💬 Which React Hook do you use the most in your projects? Comment below 👇 📌 Follow Sasikumar S for daily React insights, code challenges & growth reflections. 🤝 Connect Now: sasiias2024@gmail.com 💟 Visit: sk-techland.web.app ❤️ Follow our LinkedIn Page for more React & JavaScript wisdom. #ReactJS #ReactHooks #WebDevelopment #FrontendDeveloper #useEffect #useState #CustomHooks #JavaScript #CodingJourney #Optimization #CleanCode #SoftwareEngineering #CareerGrowth #TechLearning

𝗖𝗼𝗺𝗺𝗼𝗻 𝗥𝗲𝗮𝗰𝘁 𝗯𝘂𝗴𝘀 𝘁𝗵𝗮𝘁 𝗮𝗿𝗲 𝗮𝗰𝘁𝘂𝗮𝗹𝗹𝘆 𝘆𝗼𝘂𝗿 𝗺𝗶𝘀𝘁𝗮𝗸𝗲𝘀. The complaint: React is so slow, our app takes forever to load. The real problem: Component re-rendering 800+ times because of an infinite loop. This happens all the time. Bad code gets blamed on the framework. 𝗖𝗼𝗺𝗺𝗼𝗻 𝗥𝗲𝗮𝗰𝘁 𝗯𝘂𝗴𝘀 𝘁𝗵𝗮𝘁 𝗮𝗿𝗲 𝗮𝗰𝘁𝘂𝗮𝗹𝗹𝘆 𝘆𝗼𝘂𝗿 𝗺𝗶𝘀𝘁𝗮𝗸𝗲𝘀: 𝟭. 𝗥𝗲𝗮𝗰𝘁 𝗸𝗲𝗲𝗽𝘀 𝗿𝗲-𝗿𝗲𝗻𝗱𝗲𝗿𝗶𝗻𝗴 - You're creating new objects in render 𝟮. 𝗦𝘁𝗮𝘁𝗲 𝘂𝗽𝗱𝗮𝘁𝗲𝘀 𝗮𝗿𝗲 𝗯𝗿𝗼𝗸𝗲𝗻 - You're mutating state directly 𝟯. 𝗠𝗲𝗺𝗼𝗿𝘆 𝗹𝗲𝗮𝗸𝘀 𝗲𝘃𝗲𝗿𝘆𝘄𝗵𝗲𝗿𝗲 - You forgot to cleanup useEffect 𝟰. 𝗖𝗼𝗺𝗽𝗼𝗻𝗲𝗻𝘁𝘀 𝗮𝗿𝗲 𝘀𝗹𝗼𝘄 - You're doing heavy work without memoization 𝟱. 𝗥𝗲𝗮𝗰𝘁 𝗶𝘀 𝗯𝘂𝗴𝗴𝘆 - You don't understand JavaScript references The truth: 99% of React problems are JavaScript problems. If you don't understand how JavaScript works, you'll blame React for everything. React doesn't fix bad coding. It exposes it. Before complaining about React, ask yourself: - Do I understand why this re-render happened? - Am I following React's rules? - Is this actually a JavaScript problem? Stop looking for perfect frameworks. Start writing better JavaScript. Keep learning, keep practicing, and stay ahead of the competition. ------------------------------- Follow Sakshi Gawande for more such dev insights 💫

Build a React + TailwindCSS component library with tsdown Originally published at bosher.co.nz Learn how to build tiny, reusable React component libraries styled with TailwindCSS and bundled superfast with tsdown - all with minimal configuration. What you'll build: A production-ready React component library with TailwindCSS styling, complete with a playground Time to complete: 45-60 minutes Skill level: Intermediate (familiarity with React, node and npm packages recommended) AI Disclaimer: This article was written entirely by myself, a human. However, LLMs were used to help with grammar and spelling checks. TL;DR - Quick Setup Here's the express version if you're already familiar with the concepts: Create a project: pnpm dlx create-tsdown@latest your-project-name -t react Add react and react/jsx-runtime to the external array in tsdown.config.ts Install dependencies: pnpm add -D tailwindcss @bosh-code/tsdown-plugin-inject-css @bosh-code/tsdown-plugin-tailwindcss Configure the plugins in your tsdown config Add @import "tailwindcss"; to src/i https://lnkd.in/g-7-xAKn

Advanced React Hooks: Taking Reusability and Performance to the Next Level React’s hooks changed the way developers think about building components, they made logic reusable, modular, and cleaner. While most developers are familiar with useState and useEffect, mastering advanced hooks is what truly elevates a React codebase. These hooks help handle complex scenarios like performance optimization, shared logic, and side effect management with elegance and control. Hooks like useMemo and useCallback are essential for performance tuning. They prevent unnecessary re-renders by memoizing values and functions, ensuring React only recalculates when dependencies change. Meanwhile, useRef lets you persist mutable values across renders or directly interact with DOM elements, perfect for managing focus, animations, or external libraries. The useReducer hook is a powerful tool for handling complex state logic that would otherwise become tangled in multiple useState calls. It brings structure and predictability, especially when combined with Context for global state management. And then there’s useLayoutEffect, which allows you to run effects synchronously after all DOM mutations, ideal for layout adjustments or measuring rendered elements before the browser paints the next frame. Finally, custom hooks tie everything together. They let you extract reusable pieces of logic, from fetching data to managing authentication, without duplicating code across components. This makes your React app not just more efficient, but also easier to maintain and scale. Advanced hooks aren’t about complexity for its own sake — they’re about writing smarter, cleaner, and more maintainable React code. Learning how and when to use them transforms the way you architect your applications. 👉 Which advanced hook do you find most useful in your projects: useReducer, useMemo, or custom hooks tailored to your own logic?

React 19 just made async logic much cleaner with the new use() hook. Take a look at this before vs after, 1. Traditional way (useEffect + useState) function User() { const [user, setUser] = useState(null); useEffect(() => { fetch('/api/user') .then(res => res.json()) .then(data => setUser(data)); }, [ ]); if (!user) return <p>Loading...</p>; return <h1>Hello, { user.name }!</h1>; } 2. React 19 use() way import { use } from 'react'; const userPromise = fetch('/api/user').then(res => res.json()); function User() { const user = use(userPromise); return <h1>Hello, { user.name }!</h1>; } export default function App() { return ( <React.Suspense fallback={<p>Loading...</p>}> <User /> </React.Suspense> ); } ✨ No useState ✨ No useEffect ✨ Promise is handled automatically with Suspense. In my Medium article, I cover: ✅ How use() works behind the scenes ✅ When it can replace other hooks ✅ When you should not use it ✅ A visual flow of how it suspends rendering 📖 Read this for more understanding: https://lnkd.in/g9G6KNJj #React19 #Frontend #WebDevelopment #JavaScript #ReactHooks