React's 6-Step Rendering Process: Virtual DOM to Real DOM

In React, a Hook is just a JavaScript object. Each Hook stores: the state value a queue of updates and a reference to the next Hook Internally it looks like this: { memoizedState: state, queue: updates, next: nextHook } React stores Hooks as a linked list attached to the component's Fiber node. Fiber → Hook → Hook → Hook → null This is why Hooks must always be called in the same order. React reads them one by one during every render. When you call setState, React adds the update to the Hook's queue, and processes it during the next render. Hooks are not magic. They are simple objects connected together. Understanding this helps explain many React behaviors. #reactjs #javascript #webdevelopment

React Tip: Structure your component files Many React components become difficult to maintain because everything is written in random order inside one file. A simple structure improves readability a lot. Recommended order inside a component: 1. Imports 2. Props / Types 3. Helper or utility functions 4. State and Effects (useState, useEffect, etc.) 5. Guard clauses (loading / error handling) 6. JSX return Why this helps: • Faster understanding of the code • Easier debugging • Cleaner code reviews • Better collaboration in teams In React, performance matters — but readability matters just as much. Well-structured components make large applications easier to scale and maintain. #ReactJS #FrontendDevelopment #JavaScript #CleanCode

🏠 Lexical Scope in JavaScript Think of your code like a house with rooms. 🌍 The whole house = Global Scope 🏠 Each room = A Function 🚪 A room inside another room = Nested Function Now here’s the important rule: 👉 Inner rooms can see outside. 👉 But outside rooms can’t see inside. Let’s understand using the image: 🌍 Global Scope (Outside the house) let hero = "Alice"; 🏠 Outer Function (First room) let spell = "Fire"; 🚪 Inner Function (Room inside room) let mana = 50; console.log(hero); // ✅ Can access (Global) console.log(spell); // ✅ Can access (Outer) console.log(mana); // ✅ Its own variable ✔ Inner function can access: Its own variables Parent function variables Global variables But if the outer function tries this: console.log(mana); // ✖️ Error It fails. Because outer cannot access inner’s variables. 🔑 Simple Rule to Remember: A function can use variables from: 🏠 Its own room ⬆ Parent rooms 🌍 Global But it cannot look inside child rooms. #javascript #typescript #reactjs #nextjs #frontend_developer #react_developer #web_Developer #scope #laxical

JavaScript Event Loop – Quick Example Understanding the Event Loop is important for writing efficient asynchronous JavaScript. Example: console.log("Start") const prom = new Promise((res) => res(true)) setTimeout(() => console.log("setTimeout"), 0) process.nextTick(() => console.log("nextTick")) queueMicrotask(() => console.log("microtask")) console.log(prom) Output order will be: Start Promise { true } nextTick microtask setTimeout Why? Because JavaScript processes tasks in this order: 1. Synchronous code 2. Microtasks (nextTick, Promises, queueMicrotask) 3. Macrotasks (setTimeout, setImmediate) Understanding this helps when debugging async issues in frontend apps. #javascript #webdevelopment #frontend #vuejs #eventloop

🧑💻 Stop Chasing Frameworks. Master Fundamentals. React today. Something else tomorrow. But: • JavaScript • Rendering • Browser behavior These stay. 🎯 Action Tip: Deep dive into browser internals. Takeaway: Fundamentals outlive trends. Stay tuned for more updates and insights on the latest trends in frontend development! #FrontendGrowth #JavaScript #WebFundamentals #DeveloperLife

Day 8 of #100DaysOfCode Built a Stopwatch using JavaScript. Features: ⏱️ Start / Stop functionality. 🔄 Reset timer 📊 Real-time time tracking Continuing to improve my JavaScript fundamentals through small projects. Git-Hub Repo Link: https://lnkd.in/geZqCnQ9 #JavaScript #WebDevelopment #Frontend

Today something interesting happened while I was building a Custom Date Picker in NextJS.🗓 I have used useRef many times before, but honestly I was mostly using it without fully understanding the concept behind it But today… it finally clicked.💫 While implementing the feature, I realized that: • useRef creates a mutable object • The value is stored inside .current • The value persists between renders • Updating .current does not trigger a re-render • It can also be used to directly access DOM elements The most interesting part for me was understanding why React doesn't re-render when current changes. Sometimes you don’t truly understand a concept until you build something real with it. Small learning today, but a very satisfying one. 💫 What was the React concept that took you the longest to understand❓️ #React #JavaScript #FrontendDevelopment #ReactHooks #BuildInPublic #LearningJourney

Ever noticed this in JavaScript? 👀 -------- console.log("start"); setTimeout(() => console.log("timeout")); Promise.resolve().then(() => console.log("promise")); console.log("end"); -------- Most developers expect setTimeout to run first. But the output is: -------- start end promise timeout -------- Why? Because Promises go into the Microtask Queue, while setTimeout goes into the Macrotask Queue. The JavaScript event loop always processes all microtasks before the next macrotask once the call stack is empty. Execution order becomes: 1️⃣ Synchronous code 2️⃣ Microtasks (Promise, queueMicrotask) 3️⃣ Macrotasks (setTimeout, setInterval, DOM events) So even setTimeout(fn, 0) will run after Promise callbacks. Understanding this small detail helps explain many tricky async bugs in real applications. #javascript #webdevelopment #frontend #async #eventloop

🌐 Understanding JSX in React Today I learned how JSX allows us to write HTML inside JavaScript. 1)Embedding JavaScript inside {} 2)Single root element rule 3)How React converts JSX into JavaScript ✔ JSX = Syntactic sugar ✔ It gets compiled by Babel ✔ It becomes React.createElement() ✔ React then creates Virtual DOM objects Now React UI development feels more practical and clear. #ReactJS #JSX #FrontendDevelopment #LearningJourney

Many beginners think querySelector() in JavaScript and useRef() in React do the same thing. But React uses a Virtual DOM, so direct DOM manipulation can break React’s flow. That’s why useRef() gives controlled access to the DOM while keeping React’s architecture intact. Learning something new every day in my React journey. 🚀 #ReactJS #JavaScript #WebDevelopment #FullStackDevelopment