Web Coding With Ankur

🔍 What is indexOf() in JavaScript? The indexOf() method in JavaScript is used to find the position (index) of a specific element within a string or array . If the item is not found, it returns -1 . 🧪 Syntax For Strings: string.indexOf(searchValue, startIndex) For Arrays: array.indexOf(searchElement, fromIndex) 📘 How indexOf() Works in Strings const text = "JavaScript is amazing"; console.log(text.indexOf("Script")); // Output: 4 ✅ Case Sensitivity: console.log(text.indexOf("script")); // Output: -1 Note: indexOf() is case-sensitive. 🔁 Finding the First Occurrence const sentence = "I love JavaScript because JavaScript is fun!"; console.log(sentence.indexOf("JavaScript")); // Output: 7 🕵️‍♂️ Find All Occurrences in a String const str = "JS is cool. JS is powerful. JS is everywhere!"; let index = str.indexOf("JS"); while (index !== -1) { console.log("Found at:", index); ...

🧠 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...