Sasikumar S’ Post

SK— useRef (Build a Timer) 💡 Explanation: useRef holds values without causing re-renders. Great for timers, intervals & DOM elements. 🧩 Example: Timer function Timer() { const timerRef = useRef(null); const [seconds, setSeconds] = useState(0); const start = () => { timerRef.current = setInterval(() => setSeconds(s => s + 1), 1000); }; const stop = () => clearInterval(timerRef.current); return ( <> <h2>{seconds}s</h2> <button onClick={start}>Start</button> <button onClick={stop}>Stop</button> </> ); } 💬 Question: Have you ever used useRef to store previous values? 📌 Follow Sasikumar S for daily React reflections, dev career insights & coding inspiration. 🤝 Connect Now: sasiias2024@gmail.com 💟 Visit: sk-techland.web.app ❤️ Follow our LinkedIn Page for more React, JavaScript & software engineering growth. #ReactJS #WebDevelopment #FrontendDeveloper #JavaScript #SystemDesign #CodingJourney #SoftwareEngineering #ErrorHandling #GitFlow #ReactProjectStructure #CareerGrowth #MockInterview #TechLearning #ProblemSolving #DeveloperMindset

Today I implemented a Mount Timer using React class components to better understand how lifecycle methods behave during state changes. What this component does: Initializes state with seconds and a dynamic count threshold Uses componentDidMount() to start a setInterval timer that increments every second Uses componentDidUpdate() to detect when seconds reaches the current threshold and automatically updates the next milestone (5s → 10s → 15s…) Cleans up the interval in componentWillUnmount() to prevent memory leaks Demonstrates how continuous state updates trigger re-render cycles Why I built this: To get hands-on clarity on how React handles: Mounting vs. Updating phases State mutation inside lifecycle methods Cleanup logic Re-render behavior and async state updates Attached video shows: ->The full source code -> Step-by-step output -> Lifecycle events in real-time Always sharpening fundamentals — React is powerful when you deeply understand its lifecycle. Trainer : Ms. Meghana Meghana M 10000 Coders #ReactJS #JavaScript #FrontendEngineering #TechLearning #WebDevelopment #CleanCode

SK — createAsyncThunk (Async Calls) 💡 Explanation: createAsyncThunk helps handle async logic like API calls and automatically manages pending, fulfilled, and rejected states. 🧩 Example import { createAsyncThunk } from "@reduxjs/toolkit"; export const fetchProducts = createAsyncThunk( "products/fetch", async () => { const res = await fetch("https://lnkd.in/g6BEwS7k"); return res.json(); } ); 💬 Question: Do you manage loading & error states manually or rely on createAsyncThunk lifecycle actions? 📌 Follow Sasikumar S for daily React reflections, dev career insights & coding inspiration. 🤝 Connect Now: sasiias2024@gmail.com 💟 Visit: sk-techland.web.app ❤️ Follow our LinkedIn Page for more React, JavaScript & software engineering growth. #ReactJS #WebDevelopment #FrontendDeveloper #JavaScript #SystemDesign #CodingJourney #SoftwareEngineering #ErrorHandling #GitFlow #ReactProjectStructure #CareerGrowth #MockInterview #TechLearning #ProblemSolving #DeveloperMindset #redux

🗓️ 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

I’ve just finished the final lecture of #NamasteJavaScript series by Akshay Saini 🚀 , where he explained the this keyword along with several other important concepts. 🌍 1. Global Space In global scope, this refers to the global object (window in browsers, global in Node.js). Represents the global environment — used when a function isn’t tied to any object. ⚙️ 2. Function Scope The value of this depends on how a function is called. In regular functions → refers to the object that called the function. If no object calls it → defaults to the global object (in non-strict mode). 🧠 3. Strict vs Non-Strict Mode Strict mode: this becomes undefined if not explicitly defined — safer and more predictable. Non-strict mode: defaults to the global object, which can cause unexpected behavior. 🧩 4. Object Methods — call(), apply(), bind() call() → Calls function immediately, passing this and arguments individually. apply() → Same as call, but takes arguments as an array. bind() → Returns a new function with a fixed this value (not called immediately). 🏹 5. Arrow Functions Arrow functions don’t have their own this — they inherit it from their surrounding scope. Perfect for callbacks and nested functions. 🏗️ 6. this in the DOM In event handlers, this refers to the HTML element that triggered the event. "A heartfelt thanks to Akshay Saini 🚀 sir for JavaScript series — truly grateful for your clear explanations and dedication!" #JavaScript #WebDevelopment #Programming #CleanCodeAlways #JavaScript #CleanCode #SoftwareEngineering #DevNotes #DevLife #FrontendDeveloper #linkedinlearning #LearningJourney #CareerGrowth #CodeSmarter #NamasteJavaScript #Akshaysaini #thiskeyword

⚡ SK – Event Loop & Callback Queue: The Heart of JavaScript Execution 💡 Explanation (Clear + Concise) The event loop allows JavaScript to perform non-blocking I/O operations — executing callbacks after the main stack is clear. 🧩 Real-World Example (Code Snippet) console.log("1️⃣ Start"); setTimeout(() => console.log("3️⃣ Timeout callback"), 0); Promise.resolve().then(() => console.log("2️⃣ Promise resolved")); console.log("4️⃣ End"); // Output: // 1️⃣ Start // 4️⃣ End // 2️⃣ Promise resolved // 3️⃣ Timeout callback ✅ Why It Matters in React: Helps understand asynchronous rendering & useEffect timing. Crucial for optimizing performance and debugging async issues. 💬 Question: Have you ever faced a tricky bug due to async behavior in React? How did you debug it? 📌 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 #EventLoop #FrontendDeveloper #AsyncCode #JSFundamentals #WebPerformance

⚡ SK – Destructuring & Spread/Rest Operators: Simplifying Your JavaScript Code 💡 Explanation (Clear + Concise) Destructuring and spread/rest operators make your JavaScript code cleaner, shorter, and more readable — by unpacking or combining data from arrays and objects efficiently. 🧩 Real-World Example (Code Snippet) // 🧱 Object Destructuring const user = { name: "Sasi", role: "React Developer", city: "Chennai" }; const { name, role } = user; console.log(`${name} works as a ${role}`); // Sasi works as a React Developer // 🔁 Array Destructuring const skills = ["React", "Redux", "TypeScript"]; const [primarySkill, , extraSkill] = skills; console.log(primarySkill, extraSkill); // React TypeScript // 🚀 Spread Operator (copy or merge) const devDetails = { ...user, country: "India" }; // 🧩 Rest Operator (group remaining) const { city, ...profile } = user; console.log(profile); // { name: 'Sasi', role: 'React Developer' } ✅ Why It Matters in React: Extract props and state easily: const { title, price } = product; Pass data without mutating: setUser({ ...user, loggedIn: true }); 💬 Question: What’s one place in your recent React project where destructuring made your code cleaner? 📌 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 #ES6 #FrontendDeveloper #CodingJourney #WebDevelopment #JSFundamentals #TechLearning #CareerGrowth #CodeTips

Ever felt your codebase becoming a tangled mess of conditional logic, trying to manage a series of complex user actions or background tasks? I certainly have. Early in my career, I’d often find myself directly calling functions all over the place, making it a nightmare to add features like undo/redo or even just to test specific operations. That’s where the 𝗖𝗼𝗺𝗺𝗮𝗻𝗱 𝗣𝗮𝘁𝘁𝗲𝗿𝗻 came into play for me, especially in JavaScript. It’s a game-changer for decoupling the 'what' from the 'how'. Instead of directly executing an action, you encapsulate it as an object. This allows the sender to issue requests without knowing anything about the receiver. I've found three major wins with this pattern: 1. 𝗖𝗹𝗲𝗮𝗻𝗲𝗿 𝗖𝗼𝗱𝗲: It drastically simplifies your client code, making it more readable and maintainable by abstracting complex operations. 2. 𝗨𝗻𝗱𝗼/𝗥𝗲𝗱𝗼: Implementing history and rollback features becomes surprisingly straightforward, as each command object can store its own state and an 'unexecute' method. 3. 𝗧𝗲𝘀𝘁𝗮𝗯𝗶𝗹𝗶𝘁𝘆: Each command becomes a self-contained unit, making isolated testing a breeze. I've put together a small, practical JavaScript code example to illustrate how simple yet powerful this can be – linking it in the comments below. It's a pattern that truly empowers you to build more robust and flexible applications. How do you approach managing complex actions or operational workflows in your JavaScript projects? Have you used the Command Pattern, or do you have other favorite strategies? Let’s discuss! 👇 #JavaScript #DesignPatterns #SoftwareArchitecture #WebDevelopment #CleanCode

⚡ SK – Template Literals: Making Strings Smarter in JavaScript 💡 Explanation (Clear + Concise) Template literals let you write cleaner and more readable strings by embedding variables and expressions directly — without messy concatenations. 🧩 Real-World Example (Code Snippet) const name = "Sasi"; const framework = "React"; const years = 5; // 🎯 Before (ES5) console.log("Hi, I'm " + name + ", a " + framework + " developer with " + years + " years experience."); // 🚀 With Template Literals console.log(`Hi, I'm ${name}, a ${framework} developer with ${years} years experience.`); ✅ Why It Matters in React: Use dynamic content in JSX easily: <p>{`Welcome ${user.name}, you have ${cartItems.length} items in your cart.`}</p> Helps create cleaner UI strings for labels, logs, and notifications. 💬 Question: How often do you use template literals in your React components? 📌 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 #ES6 #TemplateLiterals #FrontendDeveloper #CodingJourney #JSFundamentals #WebDevelopment #CareerGrowth

🚀𝗝𝗮𝘃𝗮𝗦𝗰𝗿𝗶𝗽𝘁 𝗠𝗲𝘁𝗵𝗼𝗱𝘀 𝗬𝗼𝘂 𝗠𝘂𝘀𝘁 𝗞𝗻𝗼𝘄 𝗮𝘀 𝗮 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿 JavaScript methods are the building blocks that make coding efficient and powerful. From working with strings and arrays to handling objects, these methods simplify our daily development tasks. Some must-know JS methods include: 📌 map(), filter(), reduce() for arrays 📌 toUpperCase(), slice(), replace() for strings 📌 Object.keys(), Object.values() for objects Understanding these methods will help you write cleaner, faster, and smarter code. #JavaScript #WebDevelopment #FrontendDevelopment #JavaScriptConcepts #JavaScriptDeveloper #LearnJavaScript #Coding #Programming #FrontendDeveloper