Junaid Faiz’s Post

A quick React reminder for developers: Avoid putting unnecessary logic inside useEffect(). Use useEffect only when you need to handle: • data fetching • subscriptions • event listeners • cleanup functions If your code runs correctly without an effect, it shouldn’t be inside one. Keeping effects clean makes components more predictable and improves performance. #React #FrontendDevelopment #CleanCode #JavaScript #WebDevelopment #FullStackDeveloper

In React, the difference between controlled and uncontrolled components defines how you handle form data. In controlled components, React state drives the form input meaning, what you type is synced with a state variable. In uncontrolled components, the DOM keeps the data, and you access it via useRef. Controlled gives you predictability, validation, and control. Uncontrolled is simpler, less boilerplate, but harder to track and test. If you’re building anything beyond a basic form, controlled is usually the way to go. Have you ever mixed both in the same form? #react #frontend #javascript #webdevelopment

Even an empty JS file triggers the creation of a Global Execution Context (GEC) — and with it, the global object and the this keyword. 🔍 In browsers, this === window 🖥️ In Node.js, this === {} (module scope) But here’s the twist: the global object isn’t created by the JS engine (like V8) — it’s provided by the environment (browser or Node.js). 💡 Want a consistent way to access the global object across platforms? Say hello to globalThis — introduced in ES2020 to unify window and global. 📊 I’ve broken this down into a slide deck with examples, call stack behavior, and input-output questions to help you master the concept. 👇 Check out the slides and let me know what surprised you most! #JavaScript #Frontend #NodeJS #InterviewPrep #globalThis #ExecutionContext #LinkedInLearning #TechSlides #GundlapudiExplains

Small details can make a huge difference. I once built a page where dropdown selections triggered API calls to fetch large datasets. Every change called the API, the usual approach. My lead suggested caching the results in state or Redux, reusing them on repeated selections. The result: faster load times, less strain, and a much better user experience. Optimization isn’t just about bundling. Memoization, lazy loading, and smart API handling matter even before the code ships. #FrontendDeveloper #React #JavaScript #WebPerformace

🔁 JavaScript Journey: Callback Functions Callbacks are functions passed into other functions and invoked later, powering everything from array methods to timers and many Web APIs. What they are: A callback is a function you pass as an argument that the caller executes at the right time to complete a task. Callbacks can be synchronous (e.g., map, forEach) or asynchronous (e.g., setTimeout, then on a Promise). Why they matter: They enable flexible composition and deferred execution in both synchronous data transforms and asynchronous workflows. As code grows, prefer Promises or async/await to avoid deeply nested callbacks and gain stronger timing guarantees. Quick quiz: Is the callback in Array.prototype.map synchronous or asynchronous, and why does that distinction matter for side effects? What are two reasons to migrate heavy callback code to Promises or async/await in a real project? #JavaScript #Callbacks #WebDevelopment #FrontendDevelopment #CodingJourney #ProgrammingBasics #LearnInPublic #TechCommunity #Entry

Developer Tips & Insights 🔥 1. Stop Overusing useEffect in React! If you’re fetching data on mount, try React Query or custom hooks. Overusing useEffect = messy code and side effects. Think declaratively, not procedurally. 2. 🧪 Testing Tip: Don’t Test Implementation, Test Behavior Focus on what the user sees, not how your code is wired. Good: “Does the button show a loading spinner?” Bad: “Does it call setLoading(true)?” Build smarter, not harder! 🚀 Try more tools at [toolsonfire.com](https://toolsonfire.com) #React #WebDevelopment #DeveloperTips #Testing #Productivity #ToolsOnFire #JavaScript #Coding #Frontend #CleanCode #DevLife #LearnToCode #TechTips #CodeQuality #foryoupage #foryouシpage

I just published checkmyenv — a tiny Node.js CLI that keeps your environment variables in sync. What it does: Scans your codebase for process.env.* usages Compares against your .env and highlights missing/unused keys Generates/updates .env with interactive prompts Syncs with .env.example Works via npx or global install Get started: npx @eminemah/checkmyenv DB_URL API_KEY PORT SECRET_KEY checkmyenv check checkmyenv generate checkmyenv sync Repo: https://lnkd.in/dexahCGs NPM: https://lnkd.in/d6uMqXxv If you try it, I’d love your feedback and PRs! #nodejs #javascript #developerexperience #dotenv #cli #opensource

🧭 Ever clicked a button in React and somehow triggered everything around it too? I once ran into that exact scenario while working on a project — clicking “Delete” would also open the entire card’s detail view. A perfect example of event bubbling in action. It was one of those moments that remind you how powerful — and sometimes tricky — DOM event propagation can be. A single line of code, event.stopPropagation(), instantly fixed the issue and reinforced an important lesson about how events flow through React components. 💡 Check out the code example below 👇 (It’s a simple React snippet that solved the conflict.) 👉 Dive deeper into the full story on Medium: https://lnkd.in/gPTCbKbp #React #ReactJS #JavaScript #FrontendDevelopment #FrontendDeveloper #WebDevelopment #WebDev #Debugging #ProgrammingTips #CodingTips #SoftwareEngineering #DeveloperCommunity

⚛️ The Update That Broke the “useEffect + useState” Cycle! Fetching data in React used to mean juggling 🔁 useState, useEffect, dependencies... 💫 and that annoying “loading → data” flash on every render. Not anymore. 💡 Meet the new hook: use() - No state. - No effect. - No Suspense boilerplate. Think of use() as “await, but Reactified.” When you call it: - React sees a promise → pauses the render - Waits for it to resolve - Then resumes rendering with the final value ✅ The result? Your component renders once, with real data — no flickers, no dance. 🔁 Refetching? Still easy: - Change userId → React auto-refetches. - Reject a promise → ErrorBoundary catches it. - No dependencies. No stale closures. No re-renders gone wild. 🚀 It’s not just a new hook — it’s a new mindset. Your async logic just became synchronous, elegant, and lightning-fast ⚡ All with a single line of code. 💬 What’s your favorite feature in React 19! Drop it in the comments 👇 #React19 #ReactJS #ReactUpdate #FrontendDevelopment #JavaScript #ReactHooks #AsyncRendering #WebDev #Performance

We use async functions every day—but do we really understand what's happening under the hood? The browser (through the Web APIs) lets our code keep running while something like fetch is still waiting for a response. What's fascinating is when we call fetch, the browser immediately returns a Promise—a kind of placeholder that represents the future value. This lets JavaScript move on while results get handled later. Digging deeper, you find there's a whole system working underneath—the call stack, event loop, and queues (especially the microtask queue)—all coordinating how async execution actually happens. I wrote an article explaining how this works in simple terms, with clear examples: https://lnkd.in/dFnKY4yK #3hourseveryday #JavaScript #JS