Sasikumar Velmurugan’s Post

Most developers use JavaScript… but don’t truly understand it. Here’s the truth: If you don’t understand: Hoisting Scope Execution Context You’re not writing JavaScript… You’re just guessing Example: Why does this work? console.log(a); var a = 10; And this breaks? console.log(b); let b = 10; The answer lies in how JavaScript executes code internally. Behind every line of JS: Execution Context is created Memory is allocated (Hoisting) Scope chain is formed Then code runs Once you understand this, everything clicks: Closures Async JS Debugging complex bugs This is not “advanced”… This is fundamentals most people skip. Start mastering the engine, not just the syntax. Follow Royal Decode for more real dev insights #JavaScript #CodingJourney #FrontendDeveloper #ProgrammingLife #DevTips #LearnJavaScript #RoyalResearch

𝗧𝗵𝗲 𝗕𝗮𝘀𝗶𝗰𝘀 𝗼𝗳 𝗝𝗮𝘃𝗮𝗦𝗰𝗿𝗶𝗽𝘁: 𝗖𝗮𝗹𝗹𝗯𝗮𝗰𝗸𝘀, 𝗣𝗿𝗼𝗺𝗶𝘀𝗲𝘀, 𝗮𝗻𝗱 𝗔𝘀𝘆𝗻𝗰/𝗔𝘄𝗮𝗶𝘁 JavaScript is known for being asynchronous. It does not wait for slow tasks to finish. Instead, it uses patterns like callbacks, promises, and async/await. You can think of a callback as a function you give to another function. This function says: "Call me back when you're done." A promise is like a note that says: "I'll give you the data later, or I'll tell you why I failed." Async/await makes asynchronous code look synchronous. It's built on top of promises. Here's how they work: - Callbacks are simple but can get messy when you have many steps. - Promises are cleaner and easier to read. - Async/await is the most readable and looks like normal step-by-step code. If you're writing new code, async/await is usually the best choice. Source: https://lnkd.in/gXX5y8yk

🚨 Confused between the Spread (...) and Rest (...) operator in JavaScript? Many developers mix them up. 💡 They share the same syntax but serve completely different purposes depending on where they’re used. 🔹 Spread Operator • Expands elements from arrays or objects • Commonly used for copying, merging, or passing values • Helps maintain immutability in modern JavaScript • Makes code cleaner and easier to read 🔹 Rest Operator • Collects multiple values into a single array • Mostly used in function parameters or destructuring • Useful when working with an unknown number of arguments • Helps manage flexible and dynamic data ⚡ Quick rule many developers follow: • Spread → Expands values • Rest → Collects values 📌 Same syntax. Two powerful JavaScript features. #JavaScript #WebDevelopment #FrontendDevelopment #Coding #LearnToCode #100DaysOfCode

Spent weeks writing async code… but still felt uneasy whenever something didn’t behave as expected. That’s exactly how I felt about the JavaScript event loop. I used async/await, setTimeout, promises—everything seemed fine. Code ran. Features shipped. But the moment something behaved weirdly—logs out of order, delays that made no sense—I was stuck guessing. I used to think: “If it’s async, it just runs later… somehow.” Not wrong—but not helpful either. So I finally sat down and dug into the event loop. Call stack. Callback queue. Microtasks vs macrotasks. I rewrote small examples, predicted outputs, got them wrong… and tried again. And then it clicked. The problem was never “JavaScript being weird”—it was me not understanding when things actually run. That shift changed a lot: • I stopped guessing async behavior—I could predict it • Debugging became logical instead of frustrating • setTimeout(…, 0) finally made sense (and why it’s not really “instant”) • Promises vs callbacks stopped feeling interchangeable Most importantly: 👉 I realized timing in JS isn’t magic—it’s a system 👉 Understanding the event loop = understanding async JavaScript 👉 And yes… console.log order actually matters more than we think 😄 Now when something breaks, I don’t panic—I trace the flow. Still learning, but this one concept made everything feel less random. What’s one JavaScript concept that confused you for the longest time before it finally clicked? #JavaScript #WebDevelopment #AsyncProgramming #LearningInPublic #EventLoop #Debugging

Today I published a blog explaining 𝗝𝗮𝘃𝗮𝗦𝗰𝗿𝗶𝗽𝘁 𝗣𝗿𝗼𝗺𝗶𝘀𝗲𝘀 𝘂𝘀𝗶𝗻𝗴 𝗿𝗲𝗮𝗹-𝘄𝗼𝗿𝗹𝗱 𝗮𝗻𝗮𝗹𝗼𝗴𝗶𝗲𝘀. When I first learned asynchronous JavaScript, concepts like callback hell, promises, and async/await felt confusing. So I tried to understand them using simple real-life situations — like ordering food, waiting for delivery, and handling success or failure. In this blog I explain: • Callback Hell • Why Promises were introduced • Promise states (Pending → Fulfilled → Rejected) • .then(), .catch() • Async/Await Read here 👇 https://lnkd.in/g6qdW8us Thanks to Hitesh Choudhary Sir and Piyush Garg Sir for their guidance and explanations that helped me understand these concepts better. Feedback is always welcome 🙂 #LearnInPublic #JavaScript #WebDevelopment

📣 𝗡𝗲𝘅𝘁 𝗕𝗹𝗼𝗴 𝗶𝘀 𝗛𝗲𝗿𝗲! ⤵️ Arrow Functions in JavaScript — A Simpler Way to Write Functions ⚡🧠 Regular functions work fine. But when logic becomes small and frequent, typing all that syntax starts feeling heavy. This blog explains arrow functions in a clear, beginner-friendly way — focusing on syntax, mental models, and real usage. 🔗 𝗥𝗲𝗮𝗱 𝗵𝗲𝗿𝗲: https://lnkd.in/gMBAZxX5 𝗧𝗼𝗽𝗶𝗰𝘀 𝗰𝗼𝘃𝗲𝗿𝗲𝗱 ✍🏻: ⎺⎺⎺⎺⎺⎺⎺⎺⎺⎺⎺⎺⎺⎺⎺ ⇢ What arrow functions actually are ⇢ Converting normal functions to arrow step by step ⇢ Basic syntax and parameter rules ⇢ Implicit return — the real magic ⇢ When implicit return does NOT work ⇢ Using arrow functions in map(), filter(), and callbacks ⇢ Common beginner mistakes and how to fix them ⇢ When to use arrow functions vs regular functions ⇢ Practical examples for faster understanding 💬 If functions still feel verbose or repetitive, this article helps you write cleaner and more modern JavaScript. #ChaiAurCode #JavaScript #ArrowFunctions #WebDevelopment #ProgrammingBasics #Beginners #LearningInPublic #100DaysOfCoding

JavaScript generator functions are among the most underrated features of the language. They may not be prevalent in production code, but they fundamentally transform our approach to execution. A generator function can start, pause at `yield`, maintain its local state, and resume later when `.next()` is invoked. This simplicity conceals a powerful concept: values need not exist until requested by the consumer. Generators elegantly accommodate: 1. Lazy sequences 2. Incremental data processing 3. Custom iteration flows 4. Infinite streams Additionally, a generator object seamlessly integrates into JavaScript’s iteration model, serving as both an iterator and an iterable. This illustrates how language features interconnect with protocol design. I created a concise 4-slide overview of this topic to make generator functions visually accessible while retaining their technical significance. Professional growth as a developer often stems from exploring not only commonly used features but also the constructs that enhance our understanding of the language. #JavaScript #SoftwareEngineering #Frontend #FullStack #Developer

One habit that instantly improves JavaScript code quality: Avoid stacking too much logic inside a single condition. Instead of writing: if ( user && user.profile && user.profile.email ) { sendEmail( user.profile.email ); } Use optional chaining: if ( user?.profile?.email ) { sendEmail( user.profile.email ); } Cleaner and More readable. Optional chaining is not just shorter syntax. It changes how you think about data safety. #JavaScript #CleanCode #WebDevelopment

📌 Learning JavaScript Through Real Projects Recently, I worked on implementing a client-side filtering system using JavaScript — combining search input, status selection, and date filtering. One key improvement I made was restructuring my logic into reusable functions. Instead of handling everything inside an event listener, I: Created a dedicated filtering function Passed dynamic inputs (search text, status, date) Returned filtered results based on conditions This approach improved: ✔ Code readability ✔ Maintainability ✔ Reusability 💡 Takeaway: Writing working code is good — but writing scalable and reusable code is better. I’m continuing to refine how I structure logic as I build more projects. #JavaScript #FrontendDevelopment #SoftwareEngineering #CleanCode #WebDevelopment

✨ REST API Docs — Explained Visually & Simply Understanding REST APIs becomes much easier when you see the flow, not just read long paragraphs of theory. In today’s post, I’ve explained REST API documentation in a simple, visual way — using flowcharts and diagrams with minimal text. The goal is to help you quickly understand how requests move, how responses are structured, and how the entire API flow works in real-world applications. If you prefer learning through visuals instead of heavy documentation, this post is definitely for you. 👇 Do you prefer visual explanations or detailed written docs while learning APIs? Follow Muhammad Nouman for more useful content #learningoftheday #1000daysofcodingchallenge #FrontendDevelopment #WebDevelopment #JavaScript #React #Next #CodingCommunity #RESTAPI #APIDocumentation #BackendDevelopment