Mastering JavaScript Events for Predictable Code

💰 Built an Expense Tracker using JavaScript As part of strengthening my JavaScript fundamentals through projects, I built an Expense Tracker that lets users add and delete transactions, track balance, and manage income and expenses dynamically. This project helped me practice core concepts like: • DOM Manipulation • Event Handling • Form Validation • Array Methods (map, filter, reduce) • Dynamic UI Rendering • localStorage • State Management in Vanilla JavaScript Features of the app: ✅ Add new transactions ✅ Delete transactions ✅ Automatically update balance, income, and expense ✅ Store data in localStorage so data remains after refresh ✅ Show an empty state when no transactions are available ✅ Clean and responsive UI Tech Stack: HTML • CSS • JavaScript • localStorage API What I liked about this project is that it was not just about building a UI — it also made me think about data flow, calculations, and keeping the interface in sync with application state. This is part of my journey of revisiting JavaScript fundamentals by building projects before moving deeper into TypeScript, React, and full-stack development. Live Link:https://lnkd.in/gEwcBaqn GitHub Repo:https://lnkd.in/g5Pvvdyg #javascript #webdevelopment #frontenddevelopment #learninginpublic #coding

🚀 Just Built a Random Advice Generator using JavaScript & API! I recently built a small project to practice JavaScript API integration. This project fetches random advice using the Advice Slip API and displays it in a simple responsive UI. 🔹 Features • Fetches advice using Fetch API • Uses Async / Await for API handling • Button loading state while fetching data • Random background color change 🎨 • Fully responsive design 📱 🛠 Tech Stack HTML • CSS • JavaScript • Fetch API 📡 API Used https://lnkd.in/dhQVZzs9 🌐 Live Demo 👉 https://lnkd.in/dPePU2n5 💻 GitHub Repository 👉 https://lnkd.in/dJ7nNPCe This project helped me improve my understanding of JavaScript API calls, async programming, and DOM manipulation. I’ll continue building more projects to strengthen my frontend development skills. #javascript #webdevelopment #frontenddevelopment #api #100DaysOfCode #coding

JavaScript events like scroll, resize, and typing can fire hundreds of times per second. If we run heavy functions on every event, the app can become slow and inefficient. Two common solutions to control this are: Debounce and Throttle Debounce Runs the function only after the event stops firing for a specific time. Example: Search input autocomplete. Throttle Runs the function at most once in a fixed time interval, even if the event keeps firing. Example: Scroll event handling. Quick difference: Debounce → waits for user inactivity Throttle → limits how often a function can run Using these techniques improves performance, user experience, and efficiency in real-world applications. Follow for more JavaScript concepts explained visually. 🚀 #javascript #webdevelopment #frontenddeveloper #coding #softwareengineering

💡 Understanding How JavaScript Works Behind the Scenes. Excited to share a visual breakdown of how JavaScript executes code inside the browser and handles asynchronous operations. This helped me better understand how real-world web applications manage performance and responsiveness. ⚙️ Core Concepts Covered 🧠 JavaScript Execution • JavaScript Engine (Executes code) • Memory Heap (Stores variables & objects) • Call Stack (Handles function execution - LIFO) 🌐 Asynchronous Handling • Web APIs (setTimeout, fetch, DOM events) • Callback Queue (Stores async callbacks) • Event Loop (Manages execution flow between queue & stack) 🔄 Advanced Concepts • Promises (Pending → Fulfilled / Rejected) • Async/Await (Cleaner async code) • DOM Manipulation (Dynamic UI updates) 🏗 Key Takeaways • JavaScript is single-threaded but non-blocking • Event Loop plays a crucial role in async execution • Efficient handling of async tasks improves performance This concept is fundamental for building scalable and high-performance frontend applications 🚀 #JavaScript #WebDevelopment #Frontend #EventLoop #AsyncProgramming #Coding #Developer #LearningInPublic

🚀 Mastering Event Propagation in JavaScript One concept that truly leveled up my frontend debugging skills is Event Propagation. After going deep through multiple resources, medium articles, and most importantly — hands-on practice — I can confidently say: 👉 Understanding this concept separates average developers from strong problem solvers. Let me break it down simply: 🔹 Event Propagation = How events travel in the DOM There are 3 phases: 1️⃣ Capturing Phase (Top → Down) 2️⃣ Target Phase (Element itself) 3️⃣ Bubbling Phase (Bottom → Up) Most of us unknowingly work with event bubbling daily. 💡 Example: parent.addEventListener("click", () => console.log("Parent")); child.addEventListener("click", () => console.log("Child")); Clicking the child logs: Child Parent 👉 Why? Because of bubbling 🔥 Real Interview + Practical Insights: ✔️ How to stop propagation? event.stopPropagation(); ✔️ When to use capturing? addEventListener("click", handler, true); ✔️ Difference between: stopPropagation() stopImmediatePropagation() ✔️ Event delegation (used in dynamic lists, tables, large apps) ⚡ Real-world use cases I’ve handled: Fixing unwanted parent clicks in nested components Optimizing performance using event delegation Debugging complex UI interactions in large React apps 💬 My takeaway after mastering this: Understanding how events flow makes debugging 10x faster and your code more predictable. If you're preparing for frontend interviews: 👉 Don’t just memorize — visualize the flow and practice it in real DOM scenarios Happy to connect with fellow developers and discuss more 🚀 #javascript #frontend #webdevelopment #interviewpreparation #reactjs

🚀 Mastering the JavaScript Event Loop = Unlocking Async Superpowers We use `setTimeout` and `Promise` every day… but do you really know what happens behind the scenes? 🤔 Let’s break it down 👇 🔹 JavaScript is single-threaded 🔹 Synchronous code runs first (Call Stack) 🔹 Then Microtasks execute (Promises, queueMicrotask) 🔹 Then Macrotasks run (setTimeout, setInterval, DOM events) 🔹 And the cycle keeps repeating 📌 Execution Priority: 👉 Synchronous → Microtasks → Macrotasks Example 👇 console.log(1); setTimeout(() => console.log(2), 0); Promise.resolve().then(() => console.log(3)); console.log(4); ✅ Output: 1 → 4 → 3 → 2 💡 Why should you care? ✔ Debug async issues faster ✔ Write more efficient code ✔ Build better React apps ✔ Crack frontend interviews 💬 Now your turn 👇 Guess the output of this code: console.log("A"); setTimeout(() => console.log("B"), 0); Promise.resolve().then(() => { console.log("C"); }); console.log("D"); Drop your answer in the comments 👇 Let’s see who really understands the Event Loop 🔥 #JavaScript #FrontendDevelopment #ReactJS #WebDevelopment #EventLoop #CodingInterview #Angular #SoftwareEngineering

Exploring #ArrowJS , a minimalist approach to modern frontend development ArrowJS is an experimental #JavaScript library for building reactive user interfaces using native JS, without the overhead of traditional frameworks. It challenges the idea that complex tooling is required to build powerful UIs. Key highlights: • ⚡ Ultra-lightweight (~3KB) with zero dependencies • 🧩 No build step, no virtual DOM, no custom templating language • 🔄 Reactive by choice — not by default • 🧠 Leverages modern JavaScript features like template literals, modules, and proxies • 🚀 Fast and simple, with a focus on developer ergonomics The core idea? JavaScript itself has evolved enough that we don’t always need heavy frameworks to create dynamic, performant applications. ArrowJS embraces that philosophy with a “less is more” approach. Worth checking out if you’re interested in lightweight alternatives to React/Vue or exploring new patterns in frontend architecture. #JavaScript #WebDevelopment #Frontend #SoftwareEngineering #Programming #WebDev #DeveloperTools #React #Vue

🚀 𝗨𝗻𝗱𝗲𝗿𝘀𝘁𝗮𝗻𝗱𝗶𝗻𝗴 𝗝𝗮𝘃𝗮𝗦𝗰𝗿𝗶𝗽𝘁 𝗖𝗹𝗼𝘀𝘂𝗿𝗲𝘀 (The Secret Locker Story 😂) Ever felt like JavaScript remembers things even after they’re gone? 👀 Well… it actually does 😎 Let me explain 𝗖𝗹𝗼𝘀𝘂𝗿𝗲𝘀 in the simplest (and funniest) way 👇 🔐 1. Create a Locker with a Secret /* JavaScript * / function createLocker() { let secret = "💰 1 Crore Password"; return function() { console.log(secret); }; } JS be like: “Okay… I’ll keep this secret safe 🤫” 🎁 𝗧𝗮𝗸𝗲 𝘁𝗵𝗲 𝗟𝗼𝗰𝗸𝗲𝗿 𝗞𝗲𝘆 /* JavaScript * / const myLocker = createLocker(); Now the outer function is gone… finished… bye bye 👋 😳 𝗦𝗲𝗰𝗿𝗲𝘁 𝗔𝗯𝗵𝗶 𝗕𝗵𝗶 𝗟𝗶𝘃𝗲 𝗛𝗮𝗶 /* JavaScript * / myLocker(); // 💰 1 Crore Password JS says: “Function gaya toh kya hua… memory toh mere paas hai 😎” 🧠 𝗪𝗵𝗮𝘁 𝗷𝘂𝘀𝘁 𝗵𝗮𝗽𝗽𝗲𝗻𝗲𝗱? 👉 Inner function remembers outer function’s variables 👉 Even after outer function is finished 👉 This is called a Closure 😂 𝗥𝗲𝗮𝗹-𝗟𝗶𝗳𝗲 𝗔𝗻𝗮𝗹𝗼𝗴𝘆 It’s like: 👩 Mom hides sweets in a locker 🍫 🔑 Gives you the key 🏠 Leaves the house And you’re like: “अब तो मज़े ही मज़े 😎” ⚠️ 𝗜𝗺𝗽𝗼𝗿𝘁𝗮𝗻𝘁 𝗣𝗼𝗶𝗻𝘁 /* JavaScript * / const locker1 = createLocker(); const locker2 = createLocker(); 👉 Both lockers have their own secret (No sharing bro ❌😆) 💼 𝗜𝗻𝘁𝗲𝗿𝘃𝗶𝗲𝘄 𝗢𝗻𝗲-𝗟𝗶𝗻𝗲𝗿 Closure = A function that remembers variables from its outer scope even after the outer function has executed. 🔥 𝗡𝗼𝘄 𝘆𝗼𝘂𝗿 𝘁𝘂𝗿𝗻! Can you think of real use cases of closures? Drop in comments 👇👇 #JavaScript #WebDevelopment #Frontend #Coding #Programming #Developers #LearnToCode #Tech #SoftwareEngineering #ReactJS #100DaysOfCode #CodingLife

The map() function is one of the most commonly used methods in JavaScript — especially in React applications. It allows you to transform array data and return a new array. In this video, I explain: • How map() works internally • How it processes each element • How to modify values • Why it always returns a new array • Difference between map() and filter() Example: [1,2,3] → [2,4,6] map() is widely used for: • Rendering lists in React • Transforming API data • UI logic Understanding map is essential for writing efficient frontend code. 🎓 Learn JavaScript & React with real-world projects: 👉 https://lnkd.in/gpc2mqcf 💬 Comment Link and I’ll share the complete JavaScript roadmap. #JavaScript #ReactJS #FrontendEngineering #WebDevelopment #SoftwareEngineering #Programming #DeveloperEducation

🧠 Why does some JavaScript run instantly… and some runs later? Because JavaScript can be synchronous and asynchronous. 🔹 Synchronous JavaScript - JavaScript runs one line at a time. - Each task waits for the previous one to finish. Example: console.log("Start"); console.log("Middle"); console.log("End"); Output: Start → Middle → End ✅ Simple ❌ Can block execution 🔹 Asynchronous JavaScript - Some tasks don’t block execution. - They run in the background and return later. Example: console.log("Start"); setTimeout(() => { console.log("Async Task"); }, 2000); console.log("End"); Output: Start → End → Async Task 🔹 Why Async Exists Without async: - APIs would freeze the app - Timers would block everything - UI would become unresponsive 💡 Key Idea JavaScript is single-threaded, but it handles async using Web APIs + Call Stack + Event Loop (We’ll cover this next 👀) 🚀 Takeaway - Sync = step-by-step execution - Async = non-blocking execution Both are essential for real-world apps Next post: Event Loop Explained Simply 🔥 #JavaScript #AsyncJS #Frontend #WebDevelopment #LearnJS #Programming #LearningInPublic