Mastering JavaScript Fundamentals: Call Stack, Promises, Async/Await

𝗗𝗮𝘆 𝟭𝟵/𝟵𝟬 : 𝗘𝘅𝗽𝗹𝗼𝗿𝗶𝗻𝗴 𝘁𝗵𝗲 𝗞𝗲𝘆 𝗙𝗲𝗮𝘁𝘂𝗿𝗲𝘀 𝗼𝗳 𝗥𝗲𝗮𝗰𝘁 𝗝𝗦! React JS is an open-source JavaScript library that's become a go-to for building modern web applications.  Here are some of the key features that make React JS so popular among develops  𝟭. 𝗖𝗼𝗺𝗽𝗼𝗻𝗲𝗻𝘁-𝗕𝗮𝘀𝗲𝗱 𝗔𝗿𝗰𝗵𝗶𝘁𝗲𝗰𝘁𝘂𝗿𝗲 Build reusable and independent UI components, making code more modular and maintainable.  𝟮. 𝗩𝗶𝗿𝘁𝘂𝗮𝗹 𝗗𝗢𝗠 Improves performance by updating only the changed parts of the UI instead of reloading the entire page  𝟯. 𝗝𝗦𝗫 (𝗝𝗮𝘃𝗮𝗦𝗰𝗿𝗶𝗽𝘁 𝗫𝗠𝗟) Allows writing HTML-like syntax inside JavaScript, making UI development more intuitive.  𝟰. 𝗨𝗻𝗶𝗱𝗶𝗿𝗲𝗰𝘁𝗶𝗼𝗻𝗮𝗹 𝗗𝗮𝘁𝗮 𝗙𝗹𝗼𝘄  Ensures better control over data and makes applications easier to manage and debug.  𝟱. 𝗗𝗲𝗰𝗹𝗮𝗿𝗮𝘁𝗶𝘃𝗲 𝗨𝗹 Focus on “what to show” rather than “how to update”, making code predictable and easier to debug. React is widely used to build 𝗦𝗶𝗻𝗴𝗹𝗲 𝗣𝗮𝗴𝗲 𝗔𝗽𝗽𝗹𝗶𝗰𝗮𝘁𝗶𝗼𝗻𝘀 (𝗦𝗣𝗔) for faster and smoother user experiences. Check out the infographic below to learn more about these features in detail. #ReactJS #WebDevelopment #JavaScript #Frontend #Programming #90DaysOfCode

JavaScript modules are one of the most important features for writing clean and scalable code, especially as projects start to grow. A module is simply a JavaScript file that contains code we want to organize or reuse in other parts of our application. Instead of writing everything inside one large script file, modules allow us to split our code into smaller, focused files that handle specific responsibilities. This approach becomes extremely helpful when working on larger projects. Different parts of the application such as utilities, API calls, UI logic, or state management can live in separate modules. This makes the code easier to read, maintain, debug, and collaborate on with other developers. Modules work using two key concepts: export and import. We export variables, functions, or classes from one file, and then import them into another file where they are needed. This creates a clear and controlled way for different parts of an application to communicate with each other. Another advantage of modules is that each module has its own scope. Variables inside a module are private unless explicitly exported, which helps prevent naming conflicts and keeps the global scope clean. As JavaScript applications grow larger and more complex, understanding how to structure code using modules becomes an essential skill for building maintainable and scalable applications. #JavaScript #WebDevelopment #FrontendDevelopment #TechJourney #Growth

The map() function is one of the most commonly used methods in JavaScript — especially in React applications. It allows you to transform array data and return a new array. In this video, I explain: • How map() works internally • How it processes each element • How to modify values • Why it always returns a new array • Difference between map() and filter() Example: [1,2,3] → [2,4,6] map() is widely used for: • Rendering lists in React • Transforming API data • UI logic Understanding map is essential for writing efficient frontend code. 🎓 Learn JavaScript & React with real-world projects: 👉 https://lnkd.in/gpc2mqcf 💬 Comment Link and I’ll share the complete JavaScript roadmap. #JavaScript #ReactJS #FrontendEngineering #WebDevelopment #SoftwareEngineering #Programming #DeveloperEducation

🚨 A Reality Check for Modern JavaScript Developers Over the past few years, I’ve noticed something interesting in the developer community. Many developers with 3–5 years of experience working with modern frameworks like React, Angular, or Vue are extremely comfortable building applications — but often struggle with the core fundamentals of JavaScript. Frameworks are powerful, but they should extend your knowledge, not replace the basics. ⚠️ Common drawbacks of weak JavaScript fundamentals: • Difficulty debugging complex issues • Poor understanding of asynchronous behavior (Promises, Event Loop, Closures) • Over-reliance on libraries for simple problems • Inefficient or non-performant code • Struggles during technical interviews or system design discussions • Difficulty switching frameworks or learning new technologies A framework may change every few years, but JavaScript fundamentals remain constant. 💡 How developers can overcome this: 1️⃣ Revisit the core concepts of JavaScript – Closures – Prototypes & Inheritance – Event Loop – Execution Context & Call Stack – Hoisting & Scope 2️⃣ Practice writing vanilla JavaScript without frameworks. 3️⃣ Read the JavaScript specification and deep-dive articles. 4️⃣ Solve real problems and coding challenges focusing only on JS logic. 5️⃣ Build small projects using pure JavaScript before relying on frameworks. 🎯 My belief: A strong JavaScript developer can learn any framework quickly. But a framework-only developer often struggles without the framework. Let’s focus on building stronger foundations, not just learning tools. 💬 Curious to know your thoughts: Do you think modern frameworks are making developers skip JavaScript fundamentals? #JavaScript #WebDevelopment #FrontendDevelopment #Programming #ReactJS #DeveloperGrowth #Coding

🚀 How does Node.js actually run JavaScript? JavaScript was originally designed to run inside browsers. So how did it become powerful enough to run servers and handle thousands of concurrent connections? I recently created a video where I deep dive into the internal architecture of Node.js and explain what happens behind the scenes when we run: "node index.js" watch here : https://lnkd.in/gSAm7Nha In this video, I cover: 🔹 Why Node.js was created 🔹 Why JavaScript was chosen for a server runtime 🔹 The role of the V8 Engine in executing JS 🔹 How libuv enables asynchronous I/O 🔹 The Thread Pool and how Node handles heavy tasks 🔹 A clear explanation of the Event Loop 🔹 How Node.js executes your JavaScript code step by step Understanding these concepts really changes the way you think about writing backend code in Node.js. Big thanks to my mentors Hitesh Choudhary Piyush Garg and TAs ( Akash Kadlag Jay Kadlag Suraj Kumar Jha , Anirudh Jwala and Nikhil sir ) from the Web Dev Cohort for their continuous guidance and support while learning these concepts. If you are learning Node.js or backend development, this video will help you understand what’s happening under the hood. I’d love to hear your feedback and suggestions for improving the explanation. 🙌 #NodeJS #JavaScript #BackendDevelopment #WebDevelopment #SystemDesign #LearnInPublic

Back to Basics: Building a High-Performance Project in Vanilla JS! Recently, I worked on a project with a very specific client requirement: No Frameworks. Just Vanilla HTML, CSS, and JavaScript. Coming from a React.js background, where everything is component-based and state-managed, going back to the basics was both a challenge and a massive learning experience! Here’s what I realized during this build: The "Manual" Struggle: Managing the DOM manually and handling state without hooks like useState or useEffect definitely feels more "boring" and time-consuming at first. Optimization is a Real Test: Without React’s Virtual DOM, optimizing for speed and performance in plain JS is much harder. It forced me to write cleaner, more efficient scripts to keep the UI snappy. The Power of Control: While React makes everything "easy," Vanilla JS gives you absolute control over every single pixel and event listener. The Lesson? Frameworks like React are productivity powerhouses, but a strong grip on the fundamentals is what makes a developer truly "Future-Proof." It was a great experience delivering exactly what the client needed while sharpening my core engineering skills. Developers, do you think we rely too much on frameworks today? Let’s talk in the comments! 👇 #WebDevelopment #VanillaJS #JavaScript #CodingFundamentals #ClientSuccess #MERNStack #SoftwareEngineering #CareerGrowth

If you are still using plain JavaScript for production, we need to talk. 🛡️💻 Moving from JavaScript to TypeScript wasn't just a syntax change for me—it was a mindset shift toward building more reliable, enterprise-grade software. In my recent experience building complex Full-Stack architectures, I’ve realized that the "freedom" of Vanilla JS often leads to "runtime nightmares." Spending a few extra minutes defining Types upfront saves hours of debugging undefined errors in production later. Why TypeScript is now my professional standard: ✅ Type Safety: Catching bugs at compile-time, not while the user is using the app. ✅ Self-Documenting Code: Interfaces and Types tell the story of how data flows through your components. ✅ Refactoring Confidence: Need to change a prop? The compiler points out every single break across the app instantly. While Vanilla JS is great for quick prototypes and learning, TypeScript is a necessity for building robust, long-term products that scale. I’m curious—which side are you on? 🔴 Team JavaScript (Flexibility) 🔵 Team TypeScript (Reliability) Let’s discuss in the comments! 👇 #TypeScript #JavaScript #CleanCode #SoftwareEngineering #WebDev #NextJS #FullStack #CodingLife #LahoreDevelopers #BuildInPublic

Livewire: Calling methods & passing params 🚀 Did you know you can call Livewire methods directly from your HTML? One of the best things about Laravel Livewire is how easily you can run backend methods from the frontend — without writing JavaScript. Even better? You can pass parameters to those methods instantly. Here is how it helps developers: • Call methods easily using wire:click="methodName" • Pass parameters like wire:click="delete(5)" • Keep logic in your Livewire component, not in JavaScript • Build dynamic UI faster with less code Example: wire:click="deleteUser(10)" This will instantly call the deleteUser() method in your Livewire component and pass 10 as a parameter. Simple. Clean. Powerful. ⚡ Livewire makes Laravel development feel modern and reactive without the complexity of heavy JS frameworks. #Laravel #LaravelLivewire #WebDevelopment #PHPDeveloper #FullStackDevelopment #BackendDevelopment #CodingTips #SoftwareEngineering #TechLearning #ProgrammingCommunity #ShitalPrajapati #TechWithShital