Mastering JavaScript: Closures, Hoisting, and this Keyword

JavaScript – Day 19 🚀 Error Handling in Async Code (try / catch) Handling errors properly is critical when working with asynchronous JavaScript. In this post, I’ve explained: 1. Error handling with promises 2. Error handling using async / await 3. Why try / catch is the recommended approach 📌 Day 19 of my JavaScript learning series. Next: Promise.finally & custom errors 🔥 #JavaScript #AsyncJavaScript #ErrorHandling #Promises #WebDevelopment #BackendDeveloper #LearnJavaScript #Programming #Coding #DeveloperCommunity #100DaysOfCode

🚀 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

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

𝗪𝗲𝗹𝗰𝗼𝗺𝗲 𝘁𝗼 𝗗𝗮𝘆 𝟭𝟭 𝘑𝘢𝘷𝘢𝘚𝘤𝘳𝘪𝘱𝘵 𝘥𝘰𝘦𝘴𝘯’𝘵 𝘶𝘴𝘦 𝘤𝘭𝘢𝘴𝘴𝘪𝘤𝘢𝘭 𝘪𝘯𝘩𝘦𝘳𝘪𝘵𝘢𝘯𝘤𝘦. 𝘐𝘵 𝘶𝘴𝘦𝘴 𝘰𝘣𝘫𝘦𝘤𝘵-𝘵𝘰-𝘰𝘣𝘫𝘦𝘤𝘵 𝘥𝘦𝘭𝘦𝘨𝘢𝘵𝘪𝘰𝘯. Every property access walks the prototype chain — and that single mechanism explains: • how methods are shared • Why memory usage stays low • how classes and frameworks actually work If you understand this, JavaScript stops feeling “magical” and starts feeling predictable. #JavaScript #WebDevelopment #SoftwareEngineering #Frontend #InterviewPrep #Programming

🧠 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

“Everything in JavaScript is an Object” — ❌ Not True This is one of the most common myths about JavaScript. In reality, JavaScript has primitives that are NOT objects. Primitives in JS: -> number -> string -> boolean -> bigint -> symbol -> undefined -> null These are not objects, even though they sometimes behave like one. Example: "hello".toUpperCase() This works because of "AUTO-BOXING", where JavaScript temporarily wraps the primitive into an object — but the value itself remains a primitive. Follow for more tips and trick. #JavaScript #WebDevelopment #Frontend #Programming #Learning #JSConcepts #LearnInPublic

Truthy and Falsy in JavaScript JavaScript doesn’t work with only true and false. Some values are treated as truthy and others as falsy when used in conditions. Understanding this concept helps avoid bugs and write cleaner conditional logic. Sharing this as part of my JavaScript learning journey. #JavaScript #WebDevelopment #Learning #Frontend #Programming #DeveloperJourney

Today I learned about callback functions and constructor functions in JavaScript. Understanding how functions can be passed as arguments (like in DOM event handling) and how objects are created using constructor functions really improved my clarity on writing reusable code. Step by step, getting better 💡 #JavaScript #WebDevelopment #LearningInPublic #Frontend #DOM #Programming #JSBasics #DeveloperJourney

We don't know what JavaScript framework will be popular in 5 years. But sometimes it's nice to get back to the basics with some vanilla JavaScript. Especially if you're new to front-end development, skipping past those fundamentals and jumping right into a framework is doing yourself a huge disservice. By focusing on vanilla JavaScript you'll be much better equipped to learn any new tool that might come in the future. #coding #programming #softwareengineering

JavaScript – Day 18 🚀 Promise.all vs Promise.race When working with multiple asynchronous tasks, JavaScript provides Promise.all() and Promise.race() to manage them efficiently. In this post: 1. Promise.all() waits for all promises to complete 2. Promise.race() returns the result of the fastest promise These methods are commonly used in real-world applications like API calls and parallel tasks. 📌 Day 18 of my JavaScript learning series. Next: Error handling in async code (real patterns) 🔥 #JavaScript #Promises #AsyncJavaScript #WebDevelopment #FrontendDeveloper #BackendDeveloper #FullStackDeveloper #LearnJavaScript #Programming #Coding #DeveloperCommunity #100DaysOfCode