Web Coding With Ankur

🧠 Understanding map() , filter() & reduce() in JavaScript - Simplified! JavaScript offers powerful array methods to work with data efficiently. Among them, the trio of map() , filter() , and reduce() are must-know tools for every developer. This guide will break them down with simple examples that you can copy and run in your browser or code editor. 🔁 map() – Transform Every Element The map() method creates a new array by transforming each element of the original array. const numbers = [1, 2, 3, 4]; const doubled = numbers.map(num => num * 2); console.log(doubled); // Output: [2, 4, 6, 8] 💡 Use map() when you want to apply a function to each item and return a new array. 🔍 filter() – Keep What You Need The filter() method returns a new array containing elements that match a condition. const numbers = [1, 2, 3, 4, 5]; const even = numbers.filter(num => num % 2 === 0); console.log(even); // Output: [2, 4] 💡 Use fil...

🧠 Debounce in JavaScript — Explained Simply! Have you ever noticed a search box firing too many requests as you type? Or a button that triggers a function multiple times when clicked repeatedly? That’s where Debounce becomes your best friend! 🚀 What is Debounce? Debounce is a programming pattern used to limit the rate at which a function is executed. It ensures that a function runs only once after a specific delay , and only if the event hasn’t occurred again during that delay. "Debounce waits… and if no new event happens during that wait, it triggers the function!" 🛠 Why Do We Need Debounce? Without debounce, continuous user actions like: Typing in a search input Resizing the window Scrolling the page …can flood your application with function calls, degrading performance and user experience. ✅ With debounce: Smooth performance Controlled API calls Reduced CPU load 📦 Real-Life Example: Search Bar <input type=...

💡 What is Virtual DOM and Shadow DOM? A Simplified Guide for Modern Front-End Developers In modern web development, two crucial technologies that often pop up in UI performance and component architecture are the Virtual DOM and Shadow DOM . While they sound similar, they solve very different problems and serve different use cases. Let’s understand what they are, how they work, and where to use them — with an easy comparison and visual aid. 🌀 Virtual DOM – Boosting UI Efficiency The Virtual DOM is a concept used in JavaScript libraries like React and Vue . 🔍 Definition: It is an in-memory representation of the real DOM . When a UI update is triggered, the Virtual DOM is used to calculate the most efficient way to update the real DOM. ✅ Key Benefits: Faster UI updates (minimal DOM manipulations) Enables declarative UI development Drives performance in large-scale applications 🛠️ Use case: Used for efficient UI re-rendering...

📌 What is Hoisting in JavaScript? In this post, we’ll understand one of the most commonly asked JavaScript interview questions: What is Hoisting? I’ve also added a video below that explains hoisting visually. 👇 🔍 What is Hoisting? Hoisting is a JavaScript mechanism where variables and function declarations are moved to the top of their scope before code execution. 🧠 Think of it like this: Even if you declare your variables or functions at the bottom of the file, JavaScript will act as if they were declared at the top — but only the declarations, not initializations. 📂 Example 1: Variable Hoisting console.log(x); // undefined var x = 10; 🔎 Explanation: The declaration var x is hoisted to the top, but the assignment = 10 is not. So x exists but is undefined at the time of the console.log . ⚠️ Let’s Try with let or const console.log(y); // ReferenceError let y = 20; Note: Variables declared with let and const are also hoisted but are not initi...