Posts

Showing posts with the label JavaScript map filter reduce

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

-
Image
🔁 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...
Post a Comment
Read more

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

-
Image
🧠 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...
Post a Comment
Read more