React Devs Ditch Separate CSS Files with JSX & CSS-in-JS

Say Goodbye to JavaScript Date Object Headaches! For years, developers have struggled with the built-in Date object in JavaScript—it's mutable, inconsistent, and a major pain when dealing with time zones or complex date arithmetic. Most of us have relied on external libraries like Moment.js or date-fns to get the job done. But the future is here: the Temporal API is arriving as a new built-in standard, and it's a game-changer! 🚀 Temporal provides a robust, modern, and reliable way to handle dates and times. Here’s why you should be excited: 🔒 Immutability: Every Temporal object is immutable, which eliminates a major source of bugs in date manipulation. 🌍 First-Class Time Zones: It has explicit, robust support for time zones and daylight saving time (DST). ➗ Safe Arithmetic: Performing calculations like adding or subtracting days is predictable and straightforward with methods like add() and subtract(). 🎯 Clear Data Types: Instead of one generic Date object, Temporal offers distinct types for different use cases: Instant: For exact points in time. PlainDate, PlainTime, PlainDateTime: For wall-clock dates and times without a specific time zone. ZonedDateTime: For handling time-zoned timestamps. Major browsers are actively implementing the proposal. You can start experimenting with it today using a polyfill or check out the official TC39 documentation. It's time to level up our date-handling skills! Who's ready to make the switch? #JavaScript #WebDev #Frontend #Temporal #Programming #Coding #TechNews

Blog 04 of my JS Unlocked series is live! 🚀 Function Declaration vs Function Expression: What's the Difference? 👇 These two look almost the same — but one works before you define it and the other throws an error. That one difference has caused bugs in every developer's life at least once. In this one I cover: ✅ What functions are and why we need them ✅ Declaration vs Expression — side by side ✅ Hoisting explained simply (no jargon) ✅ When to use which in real projects ✅ Hands-on challenge — call both before defining and observe what happens Would love your feedback if you read it 🙏 🔗 https://lnkd.in/d9yFhfah Thanks to Hitesh Choudhary Sir, Piyush Garg #JavaScript #WebDevelopment #Hashnode #WebDevCohort2026 #LearningInPublic #Frontend #JS

🚀 Understanding "var" Scope in JavaScript In JavaScript, there are mainly three types of scope: 1️⃣ Global Scope – Variables declared outside any function are accessible everywhere in the program. 2️⃣ Function Scope – Variables declared inside a function can only be used inside that function. 3️⃣ Block Scope – Variables declared inside blocks like "{ }" (for example in "if", "for", etc.) are only accessible inside that block. However, the important thing to remember is: 👉 The "var" keyword only follows Global Scope and Function Scope. ❌ It does NOT follow Block Scope. Let’s look at a simple example: if (true) { var message = "Hello World"; } console.log(message); // Output: Hello World Even though "message" is declared inside the "if" block, we can still access it outside the block. This happens because "var" ignores block scope. Now look at a function example: function test() { var number = 10; console.log(number); // 10 } console.log(number); // Error: number is not defined Here, "number" is declared inside the function, so it cannot be accessed outside the function. ✅ Key Takeaway: - "var" → Global Scope + Function Scope - "var" ❌ does not support Block Scope That’s why modern JavaScript developers prefer "let" and "const", because they properly support block scope. #JavaScript #WebDevelopment #Programming #BackendDevelopment

Oxfmt hits Beta — and it's 30x faster than Prettier 🚀 If you're still running Prettier in your JS/TS projects, it might be time to take a serious look at Oxfmt. It's a Rust-powered formatter that's: - 30× faster than Prettier and 3× faster than Biome on cold runs - 100% Prettier-compatible — passes all of Prettier's JS/TS conformance tests - A single formatter for everything: JS, TS, JSX, TSX, CSS, SCSS, YAML, TOML, HTML, Vue, Angular, Markdown, GraphQL, and more What's new since alpha: - Built-in Tailwind CSS class sorting (no more `prettier-plugin-tailwindcss`) - Import sorting with configurable options - Embedded language formatting in template literals - `package.json` field sorting out of the box - A proper Node.js programmatic API Big names have already adopted it — `vuejs/core`, `vercel/turborepo`, `getsentry/sentry-javascript` are all on board. Migration is dead simple too — one command handles install, config migration, and reformatting. As a frontend architect, the thing that excites me most here isn't just the speed — it's consolidating your entire toolchain into one formatter. That's real DX improvement at scale. https://lnkd.in/g_S5q4fa #Oxfmt #prettier #tooling #javascript #typescript #frontend #rust #biome

One of my favorite JavaScript one-liners: .filter(Boolean) Filtering out falsy values from an array meant chaining conditions and hoping I hadn't missed an edge case. When you pass Boolean as a callback to .filter(), JavaScript calls Boolean(item) on every element. Anything falsy - null, undefined, 0, "", false, NaN - gets removed. What you're left with is a clean array of only meaningful values. It's not just about writing less code. It's about communicating intent clearly.  This pattern shines especially in real-world scenarios: cleaning up API responses, processing user input, or combining .map() and .filter() to transform and sanitize data in a single chain. #JavaScript #WebDevelopment #SoftwareEngineering #CleanCode #Frontend #Programming #JS #CodeQuality #TechTips #Developer --- I post about web engineering, front-end and soft skills in development. Follow me here: Irene Tomaini

🚀 Day 2: JSX - It’s NOT HTML Stop calling it "HTML inside JS." 🛑 One of the biggest hurdles for beginners (and a common slip-up for pros) is treating JSX like standard HTML. In 2026, with sophisticated build tools and the React Compiler, it’s even more important to understand what’s actually happening under the hood. The Concept: JSX is a Syntax Extension JSX is essentially "syntactic sugar." You aren't writing markup; you are writing function calls that describe what the UI should look like. When your code runs, a transpiler (like Babel or SWC) converts your "tags" into plain JavaScript objects. * JSX: <h1>Hello World</h1> * JavaScript: React.createElement('h1', null, 'Hello World') Interview Q: "Why can’t we use 'class' or 'for' attributes in JSX?" The Pro Answer: "Because JSX is ultimately JavaScript, and class and for are reserved keywords in the JS language. To avoid syntax conflicts, React uses camelCase properties: className instead of class, and htmlFor instead of for. This reminds us that we are manipulating the DOM through a JavaScript API, not writing a static file." 🔥 The Great Debate: Some frameworks (like Vue or Angular) use standard HTML templates with special directives. React sticks to "Everything is JS." Do you prefer the power of JSX, or do you wish we used standard HTML templates? Let’s discuss below! 👇 #ReactJS #JSX #WebDevelopment #CodingTips #100DaysOfCode #FrontendEng

🔥 Debouncing vs Throttling in JavaScript User events can fire hundreds of times per second. Examples: • Typing in a search bar • Scrolling • Window resizing If your search input calls an API on every keystroke, performance will suffer. That’s where Debouncing and Throttling help. 🟢 Debouncing Runs the function only after the user stops typing. Perfect for search inputs. function debounce(fn, delay){ let timer; return (...args)=>{ clearTimeout(timer); timer = setTimeout(()=>fn(...args), delay); }; } Example: Typing Angular → only 1 API request, not 7. 🔵 Throttling Runs a function once every X milliseconds, no matter how many times the event fires. Best for scroll or resize events. function throttle(fn, limit){ let waiting=false; return (...args)=>{ if(!waiting){ fn(...args); waiting=true; setTimeout(()=>waiting=false, limit); } }; } ⚡ Quick Rule ✔ Debounce → Final result matters (Search) ✔ Throttle → Continuous updates (Scroll) Small techniques like these can greatly improve frontend performance. Do you use debounce or throttle more in your projects? 👀 #JavaScript #Angular #Frontend #WebDevelopment #Performance

Day 25: Currying in JavaScript 🍛 Currying sounds complicated… But it’s actually a powerful functional programming technique. 🔹 What is Currying? Currying is: Transforming a function that takes multiple arguments into a sequence of functions that take one argument at a time. Instead of this 👇 function add(a, b, c) { return a + b + c; } add(2, 3, 4); // 9 We do this 👇 function add(a) { return function (b) { return function (c) { return a + b + c; }; }; } add(2)(3)(4); // 9 One argument at a time 🔹 Why Use Currying? ✔ Improves reusability ✔ Helps create specialized functions ✔ Enables function composition ✔ Common in functional programming Real Practical Example function multiply(a) { return function (b) { return a * b; }; } const double = multiply(2); const triple = multiply(3); console.log(double(5)); // 10 console.log(triple(5)); // 15 Here: multiply(2) creates a reusable function That’s powerful abstraction 🔥Modern ES6 Version (Cleaner) const add = a => b => c => a + b + c; add(1)(2)(3); // 6 Short and elegant. 🔹 Currying vs Partial Application 👉 Currying → Always single argument functions 👉 Partial Application → Fix some arguments, not necessarily one by one Example of partial application: function add(a, b) { return a + b; } const add5 = add.bind(null, 5); console.log(add5(10)); // 15 🧠 Interview Insight Currying is possible in JavaScript because: ✔ Functions are first-class citizens ✔ Functions can return functions ✔ Closures preserve outer scope values 🔥 Where It’s Used? Redux Functional libraries like Lodash Middleware patterns Advanced React patterns #JavaScript #Currying #FunctionalProgramming #Frontend #WebDevelopment #LearnInPublic

Hello, Tech Wizards 👋 🔥 JavaScript Coding Challenge – Day 4 | Scope & Tricky Logic 🔥 Simple looking. Slightly dangerous. Try before checking answers 👇 1️⃣ console.log(a); var a = 10; 2️⃣ let b = 20; { let b = 30; } console.log(b); 3️⃣ for (var i = 0; i < 3; i++) { setTimeout(() => console.log(i), 0); } 4️⃣ for (let j = 0; j < 3; j++) { setTimeout(() => console.log(j), 0); } 5️⃣ function test() { console.log(x); let x = 5; } test(); ✅ Answers & Explanation 1️⃣ 👉 undefined var is hoisted and initialized with undefined. The assignment happens later. 2️⃣ 👉 20 let is block scoped. Inner b does not affect the outer b. 3️⃣ 👉 3 3 3 var is function scoped. After loop ends, i becomes 3, and all callbacks print the same value. 4️⃣ 👉 0 1 2 let creates a new binding for each iteration. Each callback remembers its own j. 5️⃣ 👉 ReferenceError let is hoisted but not initialized. Accessing it before declaration hits the Temporal Dead Zone. 📌 Concepts covered: Hoisting var vs let Block scope Closures inside loops Temporal Dead Zone #JavaScript #JSChallenge #WebDevelopment #FrontendDevelopment #SoftwareDeveloper #Coding #TechCareers #DeveloperJourney #ReactDeveloper #WomenInTech #CareerGrowth #TechInterviewPrep

𝗦𝘁𝗼𝗽 𝘂𝘀𝗶𝗻𝗴 𝘁𝗵𝗲 𝗗𝗮𝘁𝗲 𝗼𝗯𝗷𝗲𝗰𝘁. 𝗝𝗮𝘃𝗮𝗦𝗰𝗿𝗶𝗽𝘁 𝗷𝘂𝘀𝘁 𝗴𝗿𝗲𝘄 𝘂𝗽. 🚀 If you’re in the web development space for more than a week, you’re probably aware of the pain: 1. Time zones that randomly shift. 2. Mutable dates that change when you least expect it. 3. The "Bundle Bloat" of including heavy libraries just to format a string. We’ve lived with Moment.js, date-fns, or Day.js for the past few years, thinking the "broken" native Date API would never be fixed. Well, that’s not the case anymore! Enter: 𝗧𝗵𝗲 𝗧𝗲𝗺𝗽𝗼𝗿𝗮𝗹 𝗔𝗣𝗜. 🧠 It’s not just an update; it’s an architectural shift in the way JavaScript handles time. Here’s why I think it’s the way to go for my next project: ✅ Immutability by Default: No more bugs because some helper library changed your original date object. ✅ Wall-Clock Time: Better separation of "exact time" (UTC) and "calendar time" (local). ✅ No More Timezone Math: It handles DST transitions and offsets natively. ✅ Cleaner Syntax: const today = Temporal.Now.plainDateISO(); – readable, predictable, and powerful. The Bottom Line for Teams: If you adopt the Temporal API, you get smaller bundle sizes, fewer "timezone bugs," and an easier onboarding experience for new team members. Standardising the hard stuff is how we scale as an industry. Are you still team date-fns, or are you ready to go native with Temporal? 👇 #JavaScript #WebDevelopment #Coding #SoftwareEngineering #TechTrends #Frontend #JavaScript #WebDevelopment #SoftwareEngineering #Frontend #Coding #TechTrends #Programming #TemporalAPI #CleanCode #FullStack #SoftwareArchitecture #Productivity