JavaScript: Window vs. Document Explained! 🤯 Ever wonder about the difference between window and document in JavaScript? 🤔 This quick short breaks down these fundamental browser objects. Get ready to understand the browser's global object vs. the HTML content! #JavaScript #WebDevelopment #Frontend #CodingTips #WindowVsDocument

🚨 Quick JavaScript challenge Looks like a simple object method accessing this.name. Nothing fancy. Should work… right? But the output is not what most people expect. Before running it - Ask yourself: 👉 Does an object create scope? 👉 Where does this really come from? 👉 Arrow vs normal function - who controls it? Guess the output 👇 #JavaScript #Frontend #CodingChallenge

I built this small project to experiment with the View Transitions API and query parameters. The goal was to create a smooth transition between a card list and a detail view using HTML, CSS, and JavaScript. During testing, I noticed that Chrome doesn’t render the transitions as smoothly yet, while Edge provides a noticeably smoother experience, making it a better option to preview this demo. Live demo: https://lnkd.in/e8jRGwGm #Frontend #JavaScript #CSS

Revisiting JavaScript Array Methods – filter() Revising the basic concept of filter() — it returns only the values that match a condition while keeping the original array untouched. Strong basics make advanced concepts smoother . One step at a time 🚀 #JavaScript #WebDevelopment #Frontend #MERNStack

Parser-blocking JavaScript is often an overlooked issue in frontend performance. When the browser encounters a synchronous <script> tag: • HTML parsing pauses • DOM construction stops • Script executes • Rendering is delayed This issue can easily be missed, but it is measurable in DevTools. I conducted an experiment, recorded the Performance trace, and documented how using defer alters the entire timeline. The difference is immediate and visible. #WebPerformance #JavaScript #FrontendDevelopment #HTML

Hoisting vs Closures in JavaScript 🚀 Understanding JavaScript fundamentals makes your code predictable and powerful. 🔹 Hoisting moves declarations to the top of their scope (not initializations). 🔹 Closures allow functions to remember and access variables from their outer scope, even after execution. 👉 In short: Hoisting lifts declarations, Closures preserve state. Mastering these concepts helps you write cleaner, bug-free, and more efficient JS code. #JavaScript #WebDevelopment #Frontend #CodingConcepts #JSBasics #LearnJavaScript #Developer

Hello everyone, I’d like to explain two JavaScript concepts—currying and closures—using the dynamic onChange handler in the code snippet below. Here’s a breakdown of how and why it works: 💡 The Concept: Instead of a standard function, we create a function that returns another function. 🧠 What is happening under the hood? 1. Currying (The Setup): We don't pass all arguments (field and e) at once. First, we call handleInputChange('email'). Result: This returns a new function that is sitting there, waiting specifically for the event e. 2. Closure (The Memory): Even after that first function finishes running, the returned function "remembers" the field variable ('email') because of closure. The Payoff: When React finally triggers the onChange event, our inner function executes with access to both the specific field name (saved from the closure) and the event (provided by React). One handler. Infinite inputs. Cleaner code. 🚀 Check out the implementation below. Have you used this pattern in your projects, or do you prefer a different approach? #JavaScript #ReactJS #WebDevelopment #CodingTips #CleanCode

🧩 JavaScript Output-Based Question (this + setTimeout) ❓ What will be the output? 👉 Comment your answer below (Don’t run the code ❌) Output: undefined 🧠 Why this output comes? (Step-by-Step) 1️⃣ print() is called as a method obj.print(); So inside print, this correctly refers to obj. 2️⃣ But inside setTimeout… setTimeout(function () { console.log(this.name); }, 0); The callback is a regular function, not a method of obj. When it executes: • this does NOT refer to obj • In non-strict mode → this points to the global object • In strict mode → this is undefined Either way: this.name → undefined 3️⃣ The key mistake ❌ Assuming this is preserved automatically in async callbacks 🔑 Key Takeaways ✔️ this depends on how a function is called ✔️ setTimeout callbacks lose object context ✔️ Use arrow functions or .bind() to fix this ✔️ This bug appears frequently in real projects #JavaScript #ThisKeyword #AsyncJavaScript #setTimeout #InterviewQuestions #FrontendDeveloper #MERNStack #ReactJS

🔄 for…of vs for…in in JavaScript – quick reminder for (let value of array) → gives you the values directly → clean, readable, what you want 95% of the time for (let key in object) → gives you the property names / indices (as strings!) → iterates over enumerable properties (including prototype chain ⚠️) Quick rule of thumb: ✅ Want values? → for…of ✅ Need keys on a plain object? → for…in (with hasOwn guard) 🚫 for…in on arrays? Usually better to avoid. Modern alternatives I reach for most often: • array.entries() + for…of • Object.entries() + for…of / .forEach #JavaScript #WebDevelopment #CodingTips #Frontend #TypeScript