Preamkumar Revathi’s Post

JavaScript Array Functions – reduce() reduce() is one of the most powerful (and confusing) array methods in JavaScript. It takes all the elements in an array and reduces them into a single value using an accumulator. In this post, I’ve shown: 1. How the accumulator works step by step 2. Why the initial value is important 3. How reduce() combines values across the array Common use cases: 1. Calculating totals 2. Aggregating data 3. Counting or grouping values 📌 Day 4 of my JavaScript Array Functions series. Next up: slice() vs splice() 👨💻🔥 #JavaScript #JS #WebDevelopment #FrontendDeveloper #BackendDeveloper #FullStackDeveloper #LearnJavaScript #Programming #Coding #DeveloperCommunity #TechContent #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

JavaScript Array Functions – slice() vs splice() ✂️ slice() and splice() look similar, but they behave very differently — and this confuses many JavaScript learners. In this post, I’ve explained: 1. slice() → extracts a portion of an array and returns a new array 2. splice() → modifies the original array by removing or adding elements Key difference: 1. slice() is safe (does not change original array) 2. splice() is powerful but risky (changes original array) 📌 Day 5 of my JavaScript Array Functions series. Save this if it helped 👍 #JavaScript #JS #WebDevelopment #FrontendDeveloper #BackendDeveloper #FullStackDeveloper #LearnJavaScript #Programming #Coding #DeveloperCommunity #TechContent #100DaysOfCode

🚀 JavaScript Practice: Working with Duplicate Values Today I practiced a small JavaScript logic exercise using arrays. The goal was simple: ✅ Identify duplicate values ✅ Count how many duplicates exist ✅ Store duplicated numbers separately This kind of basic problem-solving really helps strengthen core concepts like loops, conditions, and array methods. I’m learning that small daily practice matters more than solving complex problems once in a while. Consistency builds confidence. 💡 If you’re learning JavaScript too, try practicing simple logic problems every day — they slowly sharpen your thinking and coding skills 🚀 #JavaScript #WebDevelopment #Programming #Frontend #LearningInPublic #CodingJourney #DeveloperLife

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 – Day 15 🚀 Event Loop (Call Stack & Callback Queue) JavaScript is single-threaded, but it can still handle asynchronous operations using the Event Loop. In this post, I’ve explained: Call Stack Web APIs Callback Queue How async code actually runs Understanding the Event Loop is crucial for writing efficient and bug-free JavaScript. 📌 Day 15 of my JavaScript learning series. Next: Promises (then / catch / finally) 🔥 #JavaScript #EventLoop #AsyncJavaScript #WebDevelopment #FrontendDeveloper #BackendDeveloper #FullStackDeveloper #LearnJavaScript #Programming #Coding #DeveloperCommunity #TechContent #100DaysOfCode

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

Stop using for loops! Learn JavaScript's map(), filter() & reduce() in under 60 seconds with simple examples. Level up your array skills FAST! 🚀 #JavaScript #CodingTips" #JavaScript #MapFilterReduce #ArrayMethods #JavaScriptTutorial #Coding #Programming #WebDevelopment #LearnJavaScript #JS #Code #Developer #WebDev #Frontend #CodingTips

🔒 Closures in JavaScript — Ever wondered how a function in JavaScript can remember variables even after execution is complete? That’s the power of Closures 🚀 👉 A closure is formed when a function bundles itself with its lexical scope. This allows inner functions to access outer variables, even when the outer function is no longer on the call stack. 💡 Why closures matter: ✔ Data encapsulation (private variables) ✔ setTimeout & callbacks ✔ Function factories ✔ Cleaner and more powerful code Closures are one of the most important concepts for interviews and real-world JavaScript development. If you truly understand closures, you understand how JavaScript works under the hood. Save this post 📌 and share it with someone learning JS! Nishant Pal #JavaScript #WebDevelopment #Frontend #Coding #LearnJavaScript #Programming #100DaysOfCode

JavaScript gives us multiple ways to write the same function — and that’s what makes it powerful ⚡ From Function Declarations to Function Expressions, Arrow Functions, and Concise Arrow Functions, each style has its own use case and readability benefits. If you’re learning JavaScript, understanding these 4 ways will help you: ✔ write cleaner code ✔ read modern frameworks like React easily ✔ choose the right syntax for the right situation Start simple, then go concise 🚀 #JavaScript #WebDevelopment #Frontend #CodingBasics #LearnJavaScript #DeveloperLife #Programming #ReactJS