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Showing posts with the label JavaScript

🎯 What is the Event Loop in JavaScript? A Complete Guide with Diagrams

- June 24, 2025

🔁 What is the Event Loop in JavaScript? A Complete Guide with Diagrams Have you ever wondered how JavaScript handles asynchronous operations like setTimeout , Promises, or fetch() ? The secret lies in something called the Event Loop . In this blog post, we’ll break down: ✅ What the JavaScript Event Loop is ✅ How the Call Stack, Web APIs, and Queues work together ✅ A visual diagram to understand the flow ✅ A practical code example to clear your doubts 🔄 What is the Event Loop? JavaScript is a single-threaded language , meaning it can only do one thing at a time. But it still handles asynchronous tasks efficiently thanks to the Event Loop . Let’s understand how it works through its key components. 📊 Components of the Event Loop Call Stack: Where JavaScript tracks which function is currently running. Web APIs: Browser-provided functionalities like setTimeout , DOM Events , etc. Callback Queue: Holds callbacks from Web APIs waiting to be execut...

🧩 Event Delegation in JavaScript – Write Cleaner, More Efficient Code

- June 22, 2025

When building modern web applications, adding event listeners to multiple DOM elements can quickly become a hassle — and impact performance. But what if you could use just one event listener to control many elements? That’s the power of Event Delegation in JavaScript! 🔍 What is Event Delegation? Event Delegation is a JavaScript technique where a single event listener is attached to a parent element , and events from child elements are caught during the bubbling phase . Instead of assigning handlers to each item individually, you delegate the event to the parent, checking the event’s target to determine what was clicked or interacted with. 🌟 Benefits of Using Event Delegation ✅ Better Performance 📉 Reduce memory usage by attaching fewer event listeners. ✅ Simplified Code 🧹 Cleaner, more maintainable code by avoiding repetition. ✅ Dynamic Element Handling ⚙️ Easily manage elements added to the DOM after the initial page load. ✅ Improved Scalability 📈...

🚀 Unlock the Power of React JS: Build a Functional Component in Minutes!

- June 20, 2025

React JS has revolutionized the way we build modern web applications. If you’re new to React or want a refresher on creating functional components , this post will guide you through it step by step—with a live example included! 🎯 Why React JS? 🧠 Component-based architecture ⚡ Fast performance with Virtual DOM 🔁 Reusable code 🎨 Rich ecosystem for UI/UX 📦 What is a Functional Component? A functional component is a JavaScript function that returns a React element (JSX). It’s the simplest way to create components in React. 💻 Example: Creating a Simple Functional Component import React from 'react'; function Greeting(props) { return <h1>Hello, {props.name}!</h1>; } export default Greeting; Now, use this component in your main app file: import React from 'react'; import ReactDOM from 'react-dom'; import Greeting from './Greeting'; ReactDOM.render( <Greeting name="Ankur...

⚡ Throttling in JavaScript Explained with Examples

- June 19, 2025

Have you ever wondered how to control how often a function runs when triggered frequently — like on scroll, resize, or button click? That's where Throttling in JavaScript comes in. 📌 What is Throttling? Throttling is a technique used to limit the number of times a function gets called over time. Instead of calling the function every time an event fires, it ensures the function executes only once every specified interval. Use Case: Window resize , scroll tracking, infinite scroll, button spam protection, etc. 🧠 How Throttling Works Let’s say an event is triggered 50 times per second. With throttling, you can restrict the callback to run only once every 300ms or any interval you decide. 🛠️ Simple Example of Throttling function throttle(func, limit) { let lastFunc; let lastRan; return function(...args) { const context = this; if (!lastRan) { func.apply(context, args); lastRan = Date.now(); } else { clearTime...

🧠 Master JavaScript's map(), filter(), and reduce() Methods with Easy Examples!

- June 17, 2025

🧠 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...

🚀 “JavaScript Debounce Made Simple + Live Example!”

- June 15, 2025

🧠 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 Hoisting in JavaScript? 🔄 Explained with Example

- June 03, 2025

📌 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...