Optional Chaining Boosts Code Quality with Fewer Errors

💡What I Learned After Hitting These Two React Errors 1️⃣ Don’t call functions directly in JSX Writing onClick={handleClick()} executes the function during render, causing unwanted calls or even infinite loops. ✔ Use onClick={handleClick} or onClick={() => handleClick()} instead. 2️⃣ Mutating state won't trigger a re-render Updating an object like state.user.name = "John" keeps the same reference, so React won’t re-render. ✔ Always create a new object: setUser(prev => ({ ...prev, name: "John" })); Small things, big difference. 🚀 React is all about passing functions, not calling them, and immutability over mutation. #React #JavaScript #WebDevelopment #Frontend #FrontendTips

❌ Old vs ✅ New (The difference is clear) 🛑 Stop writing messy code just to access a nested property. The image below speaks for itself. Optional Chaining (?.) isn't just "syntax sugar"—it’s a necessity for: ✨ Clean Code 📖 Readability 🛡️ Crash-proof Applications Why write 5 lines when 1 line does the job better? 📉 Refactor often. Keep it clean. 🚀 👇 Tell me: Which modern JS feature saves you the most time? #JavaScript #CleanCode #WebDevelopment #ReactJS #Frontend #SajibBhattacharjee

💡React Tip💡 Never pass the setState function directly as a prop to any of the child components like this: const Parent = () => { const [state, setState] = useState({ name: '', age: '' }) . . . return ( <Child setState={setState} /> ) } ✅ The state of a component should only be changed by that component itself. ✅ This ensures your code is predictable. If you pass setState directly to multiple components, it will be difficult to identify from where the state is getting changed. ✅ This lack of predictability can lead to unexpected behavior and make debugging code difficult. ✅ Over time, as your application grows, you may need to refactor or change how the state is managed in the parent component. ✅ If sensitive data is part of the state, directly passing setState could potentially expose that data to child components, increasing security risks. ✅ React's component reconciliation algorithm works more efficiently when state and props updates are clearly defined within components. Instead of passing setState directly, you can do the following: 1️⃣ Pass data as prop: Pass the data that the child component needs as props, not the setState function itself. This way, you provide a clear interface for the child component to receive data without exposing the implementation details of state. 2️⃣ Pass function as prop: If the child component needs to interact with the parent component's state, you can pass the function as a prop. Declare a function in the parent component and update the state in that function, you can pass this function as a prop to the child component and call it from the child component when needed. 𝗧𝗵𝗶𝘀 𝗶𝘀 𝘁𝗵𝗲 𝗿𝗲𝗮𝘀𝗼𝗻, 𝘄𝗵𝗶𝗹𝗲 𝗹𝗶𝗳𝘁𝗶𝗻𝗴 𝘀𝘁𝗮𝘁𝗲 𝘂𝗽, 𝘄𝗲 𝗱𝗼𝗻'𝘁 𝗱𝗶𝗿𝗲𝗰𝘁𝗹𝘆 𝗽𝗮𝘀𝘀 𝘀𝗲𝘁𝗦𝘁𝗮𝘁𝗲 𝗳𝘂𝗻𝗰𝘁𝗶𝗼𝗻 𝘁𝗼 𝗰𝗵𝗶𝗹𝗱 𝗰𝗼𝗺𝗽𝗼𝗻𝗲𝗻𝘁𝘀, 𝗶𝗻𝘀𝘁𝗲𝗮𝗱 𝘄𝗲 𝗱𝗲𝗰𝗹𝗮𝗿𝗲 𝗮 𝗻𝗲𝘄 𝗳𝘂𝗻𝗰𝘁𝗶𝗼𝗻 𝗶𝗻 𝗽𝗮𝗿𝗲𝗻𝘁 𝗮𝗻𝗱 𝗽𝗮𝘀𝘀 𝘁𝗵𝗮𝘁 𝗮𝘀 𝗮 𝗽𝗿𝗼𝗽 𝘁𝗼 𝘁𝗵𝗲 𝗰𝗵𝗶𝗹𝗱 𝗰𝗼𝗺𝗽𝗼𝗻𝗲𝗻𝘁. 𝘍𝘰𝘳 𝘮𝘰𝘳𝘦 𝘴𝘶𝘤𝘩 𝘶𝘴𝘦𝘧𝘶𝘭 𝘤𝘰𝘯𝘵𝘦𝘯𝘵, 𝘥𝘰𝘯'𝘵 𝘧𝘰𝘳𝘨𝘦𝘵 𝘵𝘰 𝘧𝘰𝘭𝘭𝘰𝘸 𝘮𝘦. 𝗣𝗦: If you found this tip helpful, you'll definitely love my new 𝗥𝗲𝗮𝗰𝘁 𝟱𝟬+ 𝗣𝗿𝗼 𝗧𝗶𝗽𝘀 𝗘𝗯𝗼𝗼𝗸 packed with many more such practical React tips. 𝗟𝗶𝗻𝗸 𝗶𝗻 𝘁𝗵𝗲 𝗰𝗼𝗺𝗺𝗲𝗻𝘁 𝗮𝗻𝗱 𝗶𝗻 𝘁𝗵𝗲 𝗳𝗲𝗮𝘁𝘂𝗿𝗲𝗱 𝘀𝗲𝗰𝘁𝗶𝗼𝗻 𝗼𝗳 𝗺𝘆 𝗟𝗶𝗻𝗸𝗲𝗱𝗜𝗻 𝗽𝗿𝗼𝗳𝗶𝗹𝗲. #javascript #reactjs #webdevelopment

✅ Why do we use {} vs () in Arrow Functions? Most developers get confused between these two. Here’s the simple explanation 👇 1️⃣ { } → Code Block (Return Required) When you use curly braces, you’re writing normal function logic. 👉 You must write return. If you forget return, you get undefined. 2️⃣ ( ) → Implicit Return (Used for JSX) When you use parentheses, the function returns the value automatically. ✔ Cleaner ✔ Automatic return ✔ Best for multi-line JSX 🎯 Simple Rule Use { } when you have logic Use ( ) when you are directly returning something (especially JSX) #JavaScript #ReactJS #WebDevelopment #Frontend #CodingTips #JSX #ArrowFunction #LearnToCode #InterviewPrep #100DaysOfCode

Do you know the real difference between a State Update and a Key Change? 1. **State Update**: When state or props are updated, React keeps the component alive, only updating the new data. This means any internal state or form data remains intact. 2. **Key Change**: In contrast, changing the key causes React to destroy the component entirely and create a new one. As a result, all internal state is lost and resets to default. **Pro Tip**: Many developers believe keys are only for lists, but they can also be used to force a component to remount (reset). However, this action destroys the DOM, which can be costly if not approached with caution. For a practical demonstration, check out my code example: https://lnkd.in/gmtZYPnP #ReactJS #WebDevelopment #Frontend #JavaScript #ReactKey

Most people are learning everything… and mastering nothing. If your goal is to be hireable, focus on this instead: 1️⃣ Fundamentals (non-negotiable) • JavaScript / TypeScript • HTML, CSS, Responsive Design (Flexbox, Grid) • Git & version control • Browser DevTools & debugging • API integration (REST, basic GraphQL) • Accessibility basics (semantic HTML, WCAG) • Testing fundamentals (unit + end-to-end) 2️⃣ Pick ONE framework and go deep • React / Vue / Angular • Component architecture & state management • Performance basics (memoization, lazy loading, code splitting) 3️⃣ Learn these later (not on day one) • Build tools (Vite, Webpack) • Web security basics (XSS, CSRF, CORS) • CI/CD for frontend • PWAs & offline strategies • Advanced browser & performance concepts Depth > breadth. Framework hopping slows you down. Master one stack and everything else gets easier. Don’t jump from Next.js to React, to Tanstack Start, to Vue etc., You’ll end up mastering none. Frontend growth isn’t magic, it’s focus and it get simple you are a very familiar with this things💯 #SoftwareEngineering #WebDevelopment #Programming #javascript #ReactS #FrontendDevelopment

Why does this confuse people in React? Because it behaves very differently in classes vs hooks. 🧠 In React Class Components this refers to the component instance class Counter extends React.Component { state = { count: 0 }; increment() { this.setState({ count: this.state.count + 1 }); } render() { return <button onClick={this.increment}>+</button>; } } ❌ This breaks because this is lost in callbacks Fix it by: binding in constructor or using arrow functions increment = () => { this.setState({ count: this.state.count + 1 }); }; So in classes: this exists this must be bound correctly 🧠 In React Hooks (Functional Components) There is no this function Counter() { const [count, setCount] = useState(0); return <button onClick={() => setCount(count + 1)}>+</button>; } Why? Functions don’t create component instances State is handled via closures No binding issues Much simpler mental model Hooks removed this from React because this was a common source of bugs, confusion, and boilerplate. If you understand this, React suddenly feels… calmer 😌 #reactjs #javascript #frontend #interviewprep

🚀 Block Scope with let and const (JavaScript) ES6 introduced `let` and `const` for variable declarations, providing block scope. Variables declared with `let` or `const` are only accessible within the block (e.g., inside an `if` statement or a `for` loop) where they are defined. This prevents accidental modification of variables from outside the block and improves code clarity. `const` also declares a variable as read-only after initialization, providing an extra layer of protection against unintended changes. Using `let` and `const` promotes more predictable and maintainable code. Learn more on our website: https://techielearns.com #JavaScript #WebDev #Frontend #JS #professional #career #development

🚨 5 JavaScript Mistakes Most Developers Make (Early On) I made these mistakes. You probably did too. And that’s okay — learning happens here 👇 ❌ 1. Thinking JavaScript is “easy” JS looks simple… until: async bugs appear this behaves weird closures confuse you 👉 Simplicity ≠ weakness. ❌ 2. Ignoring the Event Loop If you don’t understand how async works, you’ll never fully debug JavaScript apps. Promises, async/await, callbacks — they all depend on the Event Loop. ❌ 3. Mutating objects accidentally const user = { name: "Alex" }; const copy = user; copy.name = "John"; Boom 💥 Original object changed. 👉 Reference vs Value matters more than you think. ❌ 4. Jumping to frameworks too fast React won’t fix weak JavaScript. Strong JS fundamentals = every framework feels easier. ❌ 5. Copy-pasting without understanding It works today. Breaks tomorrow. You’re stuck debugging someone else’s logic. Everyone makes mistakes. Good developers learn from them. 👉 Follow me for daily JavaScript & dev lessons 🚀 #JavaScript #WebDevelopment #Frontend #Developers #Coding #Learning

⚠️ Frameworks Don’t Make You a Good Developer It’s tempting to think learning the latest framework will fix everything. It won’t. What actually makes you good at web development: ✔️ Understanding HTML semantics ✔️ Knowing how CSS really works ✔️ Strong JavaScript fundamentals ✔️ Ability to debug and think logically Frameworks like Vue or React are just tools. If your foundation is weak, the tool won’t save you — it will only hide the problem for a while. I’ve seen developers know three frameworks but struggle with basic DOM logic. Master the basics. Frameworks will come and go — fundamentals stay. #WebDevelopment #JavaScript #Frontend #ProgrammingAdvice #LearnToCode