Preamkumar Revathi’s Post

JavaScript – Day 20 🚀 Promise.finally() & Custom Errors finally() is used to execute code regardless of a promise’s result, making it perfect for cleanup tasks. Custom errors help make error handling clearer and more maintainable in real-world applications. 📌 Day 20 of my JavaScript learning series. Next: Debouncing & Throttling (performance basics) 🔥 #JavaScript #Promises #AsyncJavaScript #ErrorHandling #WebDevelopment #BackendDeveloper #LearnJavaScript #Programming #Coding #DeveloperCommunity #100DaysOfCode

🧠 Ever wondered where a variable is accessible in your code? That’s called scope. JavaScript mainly has three types of scope 👇 🔹 Global Scope Variables declared outside any function or block Accessible everywhere 🔹 Function Scope Variables created inside a function Accessible only within that function 🔹 Block Scope Variables created inside { } (let and const only) 💡 This is why: ❌ var can cause bugs ✅ let & const are safer Understanding scope helps you: - Avoid variable conflicts - Write predictable code - Debug faster Scope isn’t advanced — it’s foundational JavaScript 🚀 #JavaScript #Scope #Frontend #WebDevelopment #LearnJS #Programming #LearningInPublic

Many beginners in JavaScript get confused between null and undefined, but the difference is actually simple. When a variable is declared but not assigned any value, JavaScript automatically gives it the value undefined. This means the variable exists, but it hasn't been initialized yet. On the other hand, null is a value that is intentionally assigned by the developer to indicate that the variable should contain no value. In simple terms: undefined → variable exists but no value has been assigned yet. null → developer deliberately sets the variable as empty. Pro Tip: Use null when you intentionally want a variable to be empty. If you just declare a variable without assigning anything, it will automatically be undefined. #JavaScript #WebDevelopment #FrontendDevelopment #CodingTips #LearnToCode #Programming #SoftwareDevelopment #Developers #TechLearning #CodingCommunity #100DaysOfCode #JavaScriptTips #CodeNewbie #WebDev

Mastering 'this' in JavaScript: A Comprehensive Guide to Context The 'this' keyword in JavaScript is notorious for its complexity and the confusion it often causes. This tutorial demystifies 'this', exploring its various contexts, common pitfalls, and how to control its value using 'call', 'apply', and 'bind' for robust application development. Read the full article 👇 https://lnkd.in/dtZbsgAB #JavaScript #Programming #WebDevelopment #Coding #Tech #thisKeyword #JavaScriptThis #FunctionBinding #CallApplyBind #ContextInJS #FutureOfWork #DigitalTransformation

JavascriptLogic#14 — Check if a String Contains a Vowel A vowel is: a, e, i, o, u We check if the word has any vowel. Example: "hello" - contains e, o ✅ Simple JavaScript Code: #JavaScript #Learning #Coding

💯 Understanding Scope in JavaScript is very important for writing clean and bug-free code. In this post, I explained: • What is Global Scope • What is Function Scope • What is Block Scope • How var, let, and const behave differently • Why scope matters in real projects Many beginners get confused between var, let, and const. Once you understand scope clearly, your JavaScript logic becomes much stronger. If you are learning JavaScript, this concept is a must-know 🚀 🔗 Connect with me on LinkedIn: https://lnkd.in/dTqFu3VR #JavaScript #WebDevelopment #FrontendDevelopment #Programming #Coding #LearnToCode #100DaysOfCode #Developer #Tech

"Built a to-do list app today using HTML + CSS + JS Small project, big learning. Live preview + code attached ↓ #WebDev #Coding #JavaScript"InternPe

🚀 JavaScript Functions – Simplified & Explained Clearly I’ve created a short and practical guide covering: ✅ Named Functions ✅ Anonymous Functions ✅ Arrow Functions (ES6) ✅ Clear examples with outputs ✅ Simple comparison summary Functions are the backbone of JavaScript. Understanding them properly makes writing clean, reusable, and scalable code much easier. If you're learning JavaScript or strengthening your fundamentals, this guide will help you build clarity. Consistent learning. Consistent improvement. 💻✨ #JavaScript #WebDevelopment #FrontendDevelopment #Coding #Programming #SoftwareDevelopment #LearnToCode

🚀 JavaScript Concept – What’s the Output? An object is stored inside an array and then the original variable is set to null. Does this change the value inside the array? 🤔 This question tests your understanding of references in JavaScript. Comment your answer below! 👇 #JavaScript #Coding #WebDevelopment #Programming #LearnTogether

null vs undefined in JavaScript — Do You Really Know the Difference? This is one of the most confusing topics for beginners (and even some developers 👀). Quick recap: ✅ undefined → Declared but no value assigned ✅ null → Intentionally assigned “empty” value But here’s the real question 👇 When should you use null instead of leaving something undefined? 🤔 Drop your answer in the comments 💬 Let’s see who truly understands JavaScript fundamentals! 🚀 #JavaScript #WebDevelopment #Coding #Programming #Developers