Everyone reads about ".call()", ".bind()", ".apply()" But the real confusion is: 👉 Where do we actually use them? A simple example from real code: const user = { name: "Jayhind" }; function greet() { console.log("Hello " + this.name); } Now imagine this function is reused somewhere else: const anotherUser = { name: "Rahul" }; greet.call(anotherUser); // Hello Rahul 👉 Here ".call()" helps us control "this" dynamically --- Now ".bind()": const greetRahul = greet.bind(anotherUser); greetRahul(); // Hello Rahul 👉 Useful when you want to store function with fixed context --- Real-world use case: class Service { constructor() { this.name = "API Service"; } log() { console.log(this.name); } } const service = new Service(); setTimeout(service.log, 1000); // undefined ❌ setTimeout(service.log.bind(service), 1000); // API Service ✅ 👉 This is where ".bind()" actually matters --- One simple way to remember: - ".call()" → run function immediately with context - ".apply()" → same as call, but args in array - ".bind()" → return new function with fixed context Most tutorials explain syntax. Real understanding comes from where it breaks. #JavaScript #NodeJS #CallBindApply #BackendDevelopment #JSConcepts

🚫 Stop using JSON.parse(JSON.stringify()) for deep cloning! It’s slow, breaks Dates, Maps, undefined, and more. Modern JS has better options like structuredClone(). If you're still using the old way in Angular or JS apps, you're risking bugs & performance issues. Read the blog & upgrade your approach 👇 #Angular #JavaScript #WebDevelopment #Frontend #CodingTips #Performance

#reactjs Let me try to explain one of the core concepts of React "Automatic batching". In this simple example, I created an `onClick` function that calls `setState` four times. My question is: when I click the button, how many times does the component re-render? And what will be the output? Let me explain, as I’ve already mentioned the answers in the example. React uses an automatic batching algorithm to batch `setState` calls. What does this mean? It means React batches all the `setState` calls in a function. If we use another state update like `setName("Aamir")`, it will still batch all the `setState` calls into one and re-render the component only once. Why? For performance reasons. If the component re-rendered four times, it would decrease performance, and it isn’t necessary to re-render multiple times. React does a great job of batching `setState` calls isn't that great? The second part is why the output of `count` is 4. This is due to closure. We are using the initial value of `count` (which is 0) for each `setState` call: `setCount(count + 1)` and `setCount(count + 2)` both use `count` as 0 because the component hasn’t re-rendered yet, so we haven’t gotten the updated value. If we want to get the latest value, we have to use the functional form like `setCount((prev) => prev + 1)`. In that way, React will still re-render only once, but it will have the latest value.

TypeScript 6.0 just dropped and honestly it's less of a feature release and more of a wake-up call. This is the last version built on JavaScript before TypeScript 7.0 arrives. Rewritten entirely in Go. And 6.0 exists for one reason: to get your codebase ready for that shift. Here's what actually matters 👇 The defaults changed. Silently. Painfully. If you haven't touched your tsconfig in a while, surprise: → strict is now true by default → module defaults to esnext → target defaults to es2025 → types defaults to empty array That last one alone can cut your build times by up to 50%. Not a typo. New things worth knowing → Temporal API types finally landed. Goodbye Date object hell. → Map.getOrInsert is now typed → RegExp.escape built in → Subpath imports with #/ now supported What's getting cleaned out before 7.0 → --moduleResolution node deprecated → AMD, UMD, SystemJS module targets gone → target: es5 deprecated → --outFile and --baseUrl both deprecated The direction is clear. TypeScript is not being polite about legacy code anymore. TypeScript 7.0 in Go is already available as a preview in VS Code. Full release expected within months. If your tsconfig still looks like it did in 2021, now is genuinely the time to fix that. Not when 7.0 drops. Now. #TypeScript #WebDevelopment #JavaScript #Frontend #SoftwareEngineering

In 2026, the "React Hack" is simply Suspense + the use hook. ### 💻 The Code Shift: function UserProfile({ id }) {  const [user, setUser] = useState(null);  const [loading, setLoading] = useState(true);  useEffect(() => {   fetchUser(id).then(data => {    setUser(data);    setLoading(false);   });  }, [id]);  if (loading) return <Spinner />;  return <div>{user.name}</div>; } The 2026 "Clean" Way: // No state, no effect, no manual loading checks. function UserProfile({ userPromise }) {  const user = use(userPromise);   return <div>{user.name}</div>; } // Wrapped in a Parent <Suspense fallback={<Spinner />}>  <UserProfile userPromise={fetchUser(id)} /> </Suspense> Why this is a win: Readable Logic: The component only cares about the UI, not the lifecycle of the fetch. Streaming: The server starts sending HTML to the browser before the data is even finished loading. Less Bugs: No more "race conditions" where the wrong data shows up because an old fetch finished late. The best code is the code you don't have to write. Are you still a useEffect purist, or have you moved your data fetching to the server? Let's talk architecture below. 👇 #ReactJS #CleanCode #WebDevelopment #JavaScript #SoftwareEngineering #Frontend

I was repeating the same logic in every component… and it started getting messy 😅 Yes, seriously. For a long time, I was doing this in React: useEffect(() => { fetchData(); }, []); const [data, setData] = useState(); const [loading, setLoading] = useState(false); Same pattern… in multiple components ❌ ⚠️ This caused: • Code duplication • Hard-to-maintain components • Bigger, messy files 💡 Then I changed my approach: Instead of repeating logic everywhere, 👉 I created a custom hook 🧠 Example: useFetch(url) Handles: • API call • Loading state • Error handling ✅ Result: • Cleaner components • Reusable logic • Easier maintenance 🔥 What I learned: If you’re repeating the same logic… you’re probably missing a custom hook. #ReactJS #FrontendDeveloper #JavaScript #CodingTips #WebDevelopment

⚠️ Props vs State in React If you don’t understand this properly… 👉 React will ALWAYS feel confusing. Let’s simplify it 👇 --- 🧩 Props (Think: Parameters) ✔ Passed from Parent → Child ✔ Read-only (cannot be changed) ✔ Used to send data Example: ```jsx <Child name="Kiran" /> ``` --- ⚙️ State (Think: Internal Memory) ✔ Managed inside the component ✔ Can be updated ✔ Controls UI behavior Example: ```jsx const [count, setCount] = useState(0); ``` --- 🔥 The Biggest Mistake: Trying to change props ❌ 👉 You can’t. --- 💡 Key Insight: Props = Input State = Internal Data --- 📌 Simple Analogy: Props = Function arguments 📥 State = Local variables 📦 --- 🧠 Pro Tip: If data needs to change → use State If data is passed → use Props --- 💬 Question: What confused you more when learning React? Props or State? #ReactJS #Frontend #JavaScript #WebDevelopment #Coding #LearnReact

𝐃𝐚𝐲 1/30 – 𝐍𝐨𝐝𝐞.𝐣𝐬 𝐒𝐞𝐫𝐢𝐞𝐬: 𝐖𝐡𝐚𝐭 𝐍𝐨𝐝𝐞.𝐣𝐬 𝐫𝐞𝐚𝐥𝐥𝐲 𝐢𝐬 (𝐛𝐞𝐲𝐨𝐧𝐝 𝐭𝐡𝐞 𝐝𝐞𝐟𝐢𝐧𝐢𝐭𝐢𝐨𝐧) Most people say: 👉 “Node.js is a JavaScript runtime built on Chrome’s V8 engine.” That’s correct… but honestly, it’s not useful in real-world discussions. Let’s understand it like an engineer 💡 𝐍𝐨𝐝𝐞.𝐣𝐬 𝐢𝐬 𝐍𝐎𝐓 𝐣𝐮𝐬𝐭 𝐚 𝐫𝐮𝐧𝐭𝐢𝐦𝐞 — 𝐢𝐭’𝐬 𝐚𝐧 𝐞𝐯𝐞𝐧𝐭-𝐝𝐫𝐢𝐯𝐞𝐧, 𝐧𝐨𝐧-𝐛𝐥𝐨𝐜𝐤𝐢𝐧𝐠 𝐬𝐲𝐬𝐭𝐞𝐦 𝐝𝐞𝐬𝐢𝐠𝐧𝐞𝐝 𝐟𝐨𝐫 𝐡𝐚𝐧𝐝𝐥𝐢𝐧𝐠 𝐜𝐨𝐧𝐜𝐮𝐫𝐫𝐞𝐧𝐭 𝐨𝐩𝐞𝐫𝐚𝐭𝐢𝐨𝐧𝐬 𝐞𝐟𝐟𝐢𝐜𝐢𝐞𝐧𝐭𝐥𝐲. What does that mean? 1. It uses a 𝐬𝐢𝐧𝐠𝐥𝐞-𝐭𝐡𝐫𝐞𝐚𝐝𝐞𝐝 𝐞𝐯𝐞𝐧𝐭 𝐥𝐨𝐨𝐩 2. It delegates heavy tasks (I/O, network, file operations) to the system 3. It doesn’t wait… it keeps moving 🔁 𝐑𝐞𝐚𝐥-𝐰𝐨𝐫𝐥𝐝 𝐞𝐱𝐚𝐦𝐩𝐥𝐞: Imagine your backend API is: 1. Reading files 2. Calling external APIs 3. Querying databases In traditional blocking systems: ➡ One request waits for another In Node.js: ➡ Multiple requests are handled 𝐰𝐢𝐭𝐡𝐨𝐮𝐭 𝐰𝐚𝐢𝐭𝐢𝐧𝐠 🧠 𝐒𝐢𝐦𝐩𝐥𝐞 𝐚𝐧𝐚𝐥𝐨𝐠𝐲: Node.js is like a smart manager: Assigns tasks to workers Doesn’t sit idle Keeps taking new tasks ⚠️ 𝐁𝐮𝐭 𝐡𝐞𝐫𝐞’𝐬 𝐭𝐡𝐞 𝐭𝐫𝐮𝐭𝐡 𝐦𝐨𝐬𝐭 𝐭𝐮𝐭𝐨𝐫𝐢𝐚𝐥𝐬 𝐬𝐤𝐢𝐩: Node.js is NOT always the best choice. ❌ CPU-heavy tasks (like image processing, large calculations) can block the event loop ❌ Poor async handling can still cause performance issues 🔥 𝐅𝐫𝐨𝐦 𝐦𝐲 𝐞𝐱𝐩𝐞𝐫𝐢𝐞𝐧𝐜𝐞: In one of my projects, instead of processing everything synchronously, we used 𝐪𝐮𝐞𝐮𝐞-𝐛𝐚𝐬𝐞𝐝 𝐚𝐬𝐲𝐧𝐜 𝐩𝐫𝐨𝐜𝐞𝐬𝐬𝐢𝐧𝐠 (similar to Service Bus pattern). This helped us: ✔ Avoid API timeouts ✔ Handle large workloads ✔ Improve system scalability ✅ 𝐓𝐚𝐤𝐞𝐚𝐰𝐚𝐲: Node.js shines when: ✔ You have I/O-heavy applications ✔ You need high concurrency ✔ You design it with async patterns correctly 📌 Tomorrow (Day 2): 𝐃𝐞𝐞𝐩 𝐝𝐢𝐯𝐞 𝐢𝐧𝐭𝐨 𝐄𝐯𝐞𝐧𝐭 𝐋𝐨𝐨𝐩 (𝐭𝐡𝐞 𝐡𝐞𝐚𝐫𝐭 𝐨𝐟 𝐍𝐨𝐝𝐞.𝐣𝐬) #NodeJS #BackendDevelopment #JavaScript #FullStack #SoftwareEngineering #SystemDesign

🚀 map() vs. forEach(): Do you know the difference? The Hook: One of the first things we learn in JavaScript is how to loop through arrays. But using the wrong method can lead to "hidden" bugs that are a nightmare to fix. 🛑 🔍 The Simple Difference: ✅ .map() is for Creating. Use it when you want to take an array and turn it into a new one (like doubling prices or changing names). It doesn't touch the original data. ✅ .forEach() is for Doing. Use it when you want to "do something" for each item, like printing a message in the console or saving data to a database. It doesn't give you anything back. 💡 Why should you care? 1. Clean Code: .map() is shorter and easier to read. 2. React Friendly: Modern frameworks love .map() because it creates new data instead of changing the old data (this is called Immutability). 3. Avoid Bugs: When you use .forEach() to build a new list, you have to create an empty array first and "push" items into it. It’s extra work and easy to mess up! ⚡ THE CHALLENGE (Test your knowledge! 🧠) Look at the image below. Most developers get this wrong because they forget how JavaScript handles "missing" returns. What do you think is the output? A) [4, 6] B) [undefined, 4, 6] C) [1, 4, 6] D) Error Write your answer in the comments! I’ll be replying to see who got it right. 👇 #JavaScript #JS #softwareEngineer #CodingTips #LearnToCode #Javascriptcommunity #Programming #CleanCode #CodingTips

Ever wondered how JavaScript handles concurrency while being single-threaded? I just published a deep dive into the Event Loop, breaking down how it works under the hood. Since this is my first article, I’m really looking forward to hearing what you think! Drop a comment with your feedback or any questions! 👇 Here is the article: https://lnkd.in/d5UWyrbE #JavaScript #WebDevelopment #SoftwareEngineering #EventLoop #CodingCommunity #Frontend #Programming