React Coding Efficiency: Safe Array Updates with Functional Updates

⚠️ A Common React Mistake We Make as React/JS Developers. I have found that one small mistake in React can create very weird UI bugs while working on using Index as Key in a List. Let me explain with an example. Check this code for displaying a list - {items.map((item, index) => ( <div key={index}>{item.name}</div> ))} The above piece of code is something we commonly use. It looks fine, but sometimes it can be dangerous - and we often ignore it. Let me explain why. At first, everything looks fine. No errors. But the real problem starts when the list changes - during insertion or deletion. Imagine the list is: 0 - React 1 - Node 2 - Next Now suppose we delete "React" (index 0). Hence, the new list becomes: 0 - Node 1 - Next But here is the problem. React thinks: Item with key 0 still exists. Item with key 1 still exists. Because the keys (0 and 1) are still there. So instead of understanding: "React was removed" React thinks: "React became Node" "Node became Next" It reuses the old components and just changes the data. Result: Wrong component updates. How can we fix it? Using a stable id as the key. {items.map((item) => ( <div key={item.id}>{item.name}</div> ))} Now imagine: id: 101 - React id: 102 - Node id: 103 - Next We delete React (101). React sees: 101 is gone 102 still exists 103 still exists So, it removes that exact component. Share your thoughts in the comment box. #ReactJS #JavaScript #WebDevelopment #FrontendDevelopment #ReactDeveloper #CodingMistakes #SoftwareDevelopment #LearnToCode #Programming

📌 JavaScript works… until it doesn’t. That’s the moment I truly understood the value of TypeScript in React. If you’re building React apps and want fewer bugs, better readability, and safer refactoring, here’s how TypeScript fits into everyday React development 👇  1.Functional Components type Props = {  title: string;  isActive?: boolean; }; const Header: React.FC<Props> = ({ title, isActive = false }) => {  return <h1>{isActive ? title : "Inactive"}</h1>; }; 2.Props with Strong Typing type ButtonProps = {  label: string;  onClick: () => void; }; const Button = ({ label, onClick }: ButtonProps) => (  <button onClick={onClick}>{label}</button> ); 3.State with Type Safety const [count, setCount] = useState<number>(0); const [user, setUser] = useState<{ name: string; age: number } | null>(null); 4. Event Handlers  const handleChange = (e: React.ChangeEvent<HTMLInputElement>) => {  console.log(e.target.value); }; For more Understanding watch following videos: -FreeCode Camp : https://lnkd.in/dhBQnVsD -PedroTech : https://lnkd.in/dbnKP-vD #React #TypeScript #FrontendDevelopment #JavaScript #WebDevelopment #ReactJS #LearningInPublic

A Common React Mistake We Make as React/JS Developers. I have found that one small mistake in React can create very weird UI bugs while working on using Index as Key in a List. Let me explain with an example. Check this code for displaying a list - {items.map((item, index) => ( <div key={index}>{item.name}</div> ))} The above piece of code is something we commonly use. It looks fine, but sometimes it can be dangerous - and we often ignore it. Let me explain why. At first, everything looks fine. No errors. But the real problem starts when the list changes - during insertion or deletion. Imagine the list is: 0 - React 1 - Node 2 - Next Now suppose we delete "React" (index 0). Hence, the new list becomes: 0 - Node 1 - Next But here is the problem. React thinks: Item with key 0 still exists. Item with key 1 still exists. Because the keys (0 and 1) are still there. So instead of understanding: "React was removed" React thinks: "React became Node" "Node became Next" It reuses the old components and just changes the data. Result: Wrong component updates. How can we fix it? Using a stable id as the key. {items.map((item) => ( <div key={item.id}>{item.name}</div> ))} Now imagine: id: 101 - React id: 102 - Node id: 103 - Next We delete React (101). React sees: 101 is gone 102 still exists 103 still exists So, it removes that exact component. Share your thoughts in the comment box. hashtag #ReactJS hashtag #JavaScript hashtag #WebDevelopment hashtag #FrontendDevelopment hashtag #ReactDeveloper hashtag #CodingMistakes hashtag #SoftwareDevelopment hashtag #LearnToCode hashtag #Programming

🧠 Most React developers fail this simple state question 👀 Especially when setState & re-renders are involved. No libraries. No tricks. Just pure React fundamentals. 🧩 Output-Based Question (React state & batching) import { useState } from "react"; export default function Counter() { const [count, setCount] = useState(0); const handleClick = () => { setCount(count + 1); console.log(count); }; return <button onClick={handleClick}>Click me</button>; } ❓ What will be printed in the console when the button is clicked? (Don’t run the code ❌) A. 1 B. 0 C. undefined D. It depends on React version 👇 Drop your answer in the comments Why this matters This question tests: • how React state updates actually work • batching & re-render behavior • stale values & closures • a very common interview trap Many developers assume setCount updates state immediately — it doesn’t. Good React developers don’t rely on assumptions. They understand how React schedules updates. 💡 I’ll pin the explanation after a few answers. #ReactJS #JavaScript #Frontend #WebDevelopment #ProgrammingFundamentals #ReactHooks #InterviewPrep #MCQ #DeveloperTips #CodeQuality

Web Development Roadmap 🚀 This visual breaks down the core skills needed to become a full-stack web developer from frontend basics like HTML, CSS, and JavaScript to modern frameworks like React, Vue, and Angular, and backend technologies including Node.js, Python, databases, and APIs. If you’re starting your web development journey or revising the fundamentals, this roadmap gives a clear picture of what to learn and how everything connects. Save it, share it, and build step by step 💻✨ #WebDevelopment #FullStackDeveloper #FrontendDevelopment #BackendDevelopment #JavaScript #ReactJS #NodeJS

When I started my frontend journey with Angular and later moved to React, I noticed an interesting difference. In React, both JSX (UI code) and logic are often written in the same file. For beginners, this can feel confusing, and as the project grows, the file can become messy. I felt this myself, and many developers I spoke with shared the same experience. While learning more, I discovered a clean and beginner-friendly solution — custom hooks. Custom hooks help us move all the logic into a separate file, so the component file focuses only on the UI (JSX). This makes the code easier to read, understand, and maintain. For anyone learning React or working on growing projects, this approach really helps keep the code clean and scalable. 🚀 Simple example 👇 Without a custom hook (logic + JSX together): function Counter() { const [count, setCount] = React.useState(0); function increase() { setCount(count + 1); } return ( <button onClick={increase}> Count: {count} </button> ); } With a custom hook (clean separation): // useCounter.js function useCounter() { const [count, setCount] = React.useState(0); const increase = () => setCount(count + 1); return { count, increase }; } // Counter.jsx function Counter() { const { count, increase } = useCounter(); return ( <button onClick={increase}> Count: {count} </button> ); } This small change makes components simpler and helps a lot when projects become large. 🚀 #FrontendDevelopment #ReactJS #Angular #JavaScript #WebDevelopment #BeginnerDeveloper #LearningReact #CodingJourney #CleanCode #CustomHooks #SoftwareDevelopment #DeveloperLife

Before React and Next.js: Do You Really Know How JavaScript Works? As a Frontend Developer, every day I write and read countless lines of JavaScript and fix bugs across dev, QA, and production environments. Earlier in my career, I wasn’t really aware of how JavaScript works behind the scenes. I used to just write code, and whenever I got stuck, I would search Stack Overflow to figure out why something wasn’t working. One day, I realized this habit wouldn’t help me grow into a better developer. So I decided to understand how JavaScript actually works under the hood. I started searching on YouTube with random keywords like “JavaScript behind the scenes”. That’s when I discovered Akshay Saini 🚀 Namaste JavaScript series. From there, I learned about: - Hoisting - Event Loop - JavaScript Engine - Call Stack - Microtasks & Macrotasks - Callback Queue Before this, these terms felt like “JavaScript hell.” But once you understand them, your way of writing JavaScript completely changes. After completing Namaste JavaScript, my curiosity grew even more. I wanted to go deeper. I searched for books that explain JavaScript internals—and that’s when I found Kyle Simpson’s book series “You Don’t Know JavaScript Yet.” Even the title made me curious. I bought the entire series and jumped straight into Scope & Closures. I’ve read only one chapter so far, but the way Kyle explains how JavaScript code is executed is mind-opening. I’ll share a brief breakdown in my next post. Today, I often see new developers jumping directly into React or Next.js. As a senior developer, I feel it’s my responsibility to guide them. 👉 Before learning React, Next.js, or any JavaScript framework, first understand how JavaScript works internally. Once your JavaScript fundamentals are strong, frameworks become much easier—and you’ll write better, more predictable code. #javascript #frontend #typescript

Mini Search Module – Node.js + React 🍔🔍 Excited to share a mini search module I built using Node.js and React! This project allows users to search food items using both search buttons and a search input field, making the experience smooth and interactive. ✨ Key Highlights 🔎 Real-time food searching 🧠 Clean logic for filtering data ⚛️ React for dynamic UI updates 🌐 Node.js backend handling search requests 🎯 Simple, fast, and user-friendly design #ReactJS #NodeJS #FullStackDevelopment #WebDevelopment #JavaScript #LearningByBuilding #MiniProject #FrontendDevelopment #BackendDevelopment #MERN #StudentDeveloper #CodingJourney #SoftwareEngineering

🚀 React Native 0.84: What’s New & What You Need to Know React Native 0.84 is one of the most impactful releases yet—bringing speed, efficiency, and a cleaner architecture. https://lnkd.in/gR6zxtj8 #ReactNative #MobileDevelopment #JavaScript #HermesEngine #iOSDevelopment #AndroidDevelopment #OpenSource #DeveloperCommunity #Performance #TechUpdates