Manas Mishra’s Post

📌 call, apply, bind in JavaScript These methods are used to control the value of this inside a function. 🔹 call() Calls a function immediately and sets this. Use case: Borrow a function from another object. 🔹 apply() Same as call, but arguments are passed as an array. Use case: Useful when arguments are already in an array. 🔹 bind() Returns a new function with this permanently bound. Use case: Used in callbacks, event handlers, and async code. Thanks to - aka Anshu Pandey #JavaScript #WebDevelopment #Frontend #JSConcepts #Developers

🚀 Promises (JavaScript) Promises are objects representing the eventual completion (or failure) of an asynchronous operation and its resulting value. A Promise can be in one of three states: pending, fulfilled, or rejected. Promises provide a cleaner and more structured way to handle asynchronous code compared to callbacks. They allow you to chain asynchronous operations using `.then()` for success and `.catch()` for error handling. Promises make asynchronous code more readable and maintainable, reducing callback hell and improving error handling. The `async/await` syntax is built on top of Promises, making asynchronous code even easier to write and understand. Learn more on our website: https://techielearns.com #JavaScript #WebDev #Frontend #JS #professional #career #development

Why JavaScript fundamentals still matter (even with frameworks) Frameworks change. JavaScript stays. React, Next.js, and others make development faster - but they don’t replace the basics. They’re built on top of them. Here’s why JS fundamentals still matter to me 👇 • Debugging Understanding closures, scope, async behavior, and the event loop makes bugs easier to find and fix. • Performance Knowing how JavaScript works under the hood helps avoid unnecessary re-renders, heavy computations, and memory leaks. • Better architecture Clean data flow, predictable state, and readable logic all start with solid JS, not with a framework feature. • Framework independence When you know the fundamentals, switching tools becomes easier. You’re not locked into one ecosystem. Frameworks help you move faster. Fundamentals help you move right. That combination is what makes frontend code scalable and long-living. What JavaScript concept helped you the most as you grew? #frontend #frontenddeveloper #javascript #react #webdevelopment #cleanCode

🚀 Using async/await for Asynchronous Operations (JavaScript) The `async` and `await` keywords provide a more concise and readable way to work with asynchronous JavaScript. The `async` keyword is used to define an asynchronous function, which implicitly returns a Promise. The `await` keyword can only be used inside an `async` function, and it pauses the execution of the function until the Promise resolves. This allows you to write asynchronous code that looks and behaves more like synchronous code, improving readability and maintainability. #JavaScript #WebDev #Frontend #JS #professional #career #development

💡 What is Lit.js? As part of my journey learning Lit.js, here’s how I currently understand it: Lit is a JavaScript library built on top of 𝐖𝐞𝐛 𝐂𝐨𝐦𝐩𝐨𝐧𝐞𝐧𝐭𝐬 that helps you create: • 𝗥𝗲𝘂𝘀𝗮𝗯𝗹𝗲 𝗨𝗜 𝗰𝗼𝗺𝗽𝗼𝗻𝗲𝗻𝘁𝘀 • 𝐖𝐢𝐭𝐡 𝐩𝐥𝐚𝐢𝐧 𝐇𝐓𝐌𝐋 & 𝐉𝐚𝐯𝐚𝐒𝐜𝐫𝐢𝐩𝐭 • 𝐖𝐢𝐭𝐡𝐨𝐮𝐭 𝐛𝐞𝐢𝐧𝐠 𝐥𝐨𝐜𝐤𝐞𝐝 𝐢𝐧𝐭𝐨 𝐚 𝐟𝐫𝐚𝐦𝐞𝐰𝐨𝐫𝐤 What stood out to me: ✅ Very small and fast ✅ Uses web standards ✅ Works with any framework (or none) It feels like a great option for design systems and long-term maintainability. Have you explored Lit.js or Web Components yet? 👇 #LitJS #WebComponents #FrontendDevelopment #JavaScript

🚀 Using `exec()` Method for Detailed Matching (JavaScript) The `exec()` method of a regular expression object searches a string for a match and returns an array containing information about the match, or `null` if no match is found. The returned array includes the matched substring, the index of the match, and any captured groups. Unlike `test()`, `exec()` provides detailed information about the matched string. When used with the `g` flag, it can be called repeatedly to find all matches. #JavaScript #WebDev #Frontend #JS #professional #career #development

🚀 JavaScript Hoisting: A Practical Breakdown Hoisting describes how JavaScript processes declarations before code execution. What actually gets hoisted — and how — depends on the type of declaration, which is why different keywords behave differently. 🔹 Function Declarations Function declarations are fully hoisted, so they can be called before they appear in the code. greet(); // Works function greet() {  console.log("Hello!"); } 🔹 var Variables var declarations are hoisted, but their values are not. Before assignment, the variable is undefined. console.log(count); // undefined var count = 3; 🔹 let Variables let is hoisted but placed in the Temporal Dead Zone (TDZ). Accessing it before declaration throws an error. console.log(total); // ReferenceError let total = 10; 🔹 const Variables const behaves like let in terms of hoisting and TDZ, but its value cannot be reassigned. console.log(rate); // ReferenceError const rate = 5; 🔹 Function Expressions & Arrow Functions These are hoisted only as variables, not as functions. sayHi(); // TypeError const sayHi = () => {  console.log("Hi!"); }; #JavaScript #Hoisting #WebDevelopment #Frontend #CleanCode #Developers

Ever wondered why people say “React is declarative”? 🤔 Here’s the simplest way I understand it 👇 In traditional JavaScript, we tell the browser HOW to do things step by step: 👉 find this element 👉 update its text 👉 change its color 👉 handle edge cases React flips this mindset. In React, we just say WHAT the UI should look like for a given state. 🧠 “If the state is this → UI should look like this.” And React handles the how internally. This declarative approach makes code: ✅ easier to read ✅ easier to debug ✅ easier to scale Instead of fighting the DOM, we focus on logic and state, and React takes care of updating the UI efficiently using the Virtual DOM. Once this clicked for me, React started making a lot more sense 💡 If you’re learning React — this mindset shift is a game changer. #ReactJS #WebDevelopment #Frontend #JavaScript #LearningInPublic #DeveloperJourney

Custom Hooks are one of those React features that can significantly enhance your codebase. If you find yourself duplicating the same useEffect, state, or API logic across components, it's a clear indication that you should create a custom hook. In just three simple steps, you can: • Extract reusable logic • Keep components clean • Improve readability and maintainability This approach scales effectively for real-world applications and simplifies testing and reasoning about your code. Pro tip: If your component is doing too much, it’s likely time for a hook. Save this for later and share it with someone learning React. #ReactJS #FrontendDevelopment #JavaScript #WebDev #ReactHooks #CleanCode #DevCommunity 

🚀 JavaScript: Promise vs Async/Await (with Diagram) Promises JavaScript me asynchronous kaam handle karne ke liye use hote hain. Lekin jab multiple .then() chaining ho jaati hai, to code thoda complex aur hard to read lagne lagta hai. 👉 Promise approach: .then() → .then() → .catch() 👉 Async/Await approach: Same Promise, but code sequential aur readable ho jaata hai. Important point 💡 Async/Await koi naya concept nahi hai. Yeh Promises ka hi cleaner syntax hai (jise hum syntactic sugar bhi kehte hain). Is diagram ke through maine Promise aur Async/Await ka flow simple aur visual way me explain karne ki koshish ki hai. 💬 Aap real projects me kya prefer karte ho? Promise ya Async/Await? #javascript #webdevelopment #frontend #reactjs #asyncawait #promise #learning #interviewprep