React Hooks vs Utils: Organizing Logic for Scalable Apps

🚀 𝐃𝐚𝐲 2/30 – 𝐍𝐨𝐝𝐞.𝐣𝐬 𝐒𝐞𝐫𝐢𝐞𝐬: 𝐄𝐯𝐞𝐧𝐭 𝐋𝐨𝐨𝐩 (𝐓𝐡𝐞 𝐇𝐞𝐚𝐫𝐭 𝐨𝐟 𝐍𝐨𝐝𝐞.𝐣𝐬) If you understand this, you understand Node.js. Most developers say Node.js is single-threaded… 👉 But still wonder: “How does it handle multiple requests?” The answer = 𝐄𝐯𝐞𝐧𝐭 𝐋𝐨𝐨𝐩 🔁 💡 𝐖𝐡𝐚𝐭 𝐢𝐬 𝐄𝐯𝐞𝐧𝐭 𝐋𝐨𝐨𝐩? It’s a mechanism that: ➡ Continuously checks if tasks are completed ➡ Moves completed tasks to execution ➡ Ensures Node.js doesn’t block 🧠 𝐇𝐨𝐰 𝐢𝐭 𝐚𝐜𝐭𝐮𝐚𝐥𝐥𝐲 𝐰𝐨𝐫𝐤𝐬 (𝐬𝐢𝐦𝐩𝐥𝐢𝐟𝐢𝐞𝐝): Call Stack → Executes code Web APIs / System → Handles async tasks (I/O, timers, API calls) Callback Queue → Stores completed tasks Event Loop → Pushes them back to stack when ready 🔁 𝐑𝐞𝐚𝐥-𝐰𝐨𝐫𝐥𝐝 𝐟𝐥𝐨𝐰: 𝘤𝘰𝘯𝘴𝘰𝘭𝘦.𝘭𝘰𝘨("𝘚𝘵𝘢𝘳𝘵"); 𝘴𝘦𝘵𝘛𝘪𝘮𝘦𝘰𝘶𝘵(() => { 𝘤𝘰𝘯𝘴𝘰𝘭𝘦.𝘭𝘰𝘨("𝘛𝘪𝘮𝘦𝘰𝘶𝘵 𝘥𝘰𝘯𝘦"); }, 0); 𝘤𝘰𝘯𝘴𝘰𝘭𝘦.𝘭𝘰𝘨("𝘌𝘯𝘥"); 👉 Output: Start End Timeout done ❗ Even with 0ms, it waits — because Event Loop prioritizes the call stack first. ⚡ Why this matters in real projects Let’s say: 100 users hit your API Each API calls DB + external service Without event loop: ❌ Requests block each other With Node.js: ✅ Requests are handled asynchronously ✅ System stays responsive 🔥 From my experience: In production systems, long-running operations (like file processing, invoice parsing, etc.) should NOT sit in the event loop. 👉 We offloaded them to async queues (Service Bus / workers) Why? ✔ Keeps event loop free ✔ Avoids blocking requests ✔ Improves scalability ⚠️ Common mistake developers make: while(true) { // heavy computation } ❌ This blocks the event loop → entire app freezes ✅ Takeaway: Event Loop is powerful, but: ✔ Keep it light ✔ Offload heavy tasks ✔ Design async-first systems 📌 Tomorrow (Day 3): Callbacks → Why they caused problems (Callback Hell) #NodeJS #EventLoop #JavaScript #BackendDevelopment #SystemDesign #FullStack

Hitesh Choudhary I used to think frontend and backend just “connect automatically.” Like magic. Click a button → data appears. But after this lecture, I finally understood what actually happens behind the scenes… and it’s not magic at all. It’s configuration, rules, and a lot of small things working together. 💻 What I learned: • How frontend and backend communicate through APIs • Why CORS exists (and why it blocks your requests 😅) • How proxy helps in development to avoid CORS issues • Real request flow: Frontend ➝ Backend ➝ Response • Why things break even when your code looks “correct” 💡 Biggest realization: The hardest part is not writing code… It’s making different systems talk to each other properly. Once that clicked, full-stack development started making more sense. ⚡ What I’m focusing on next: • Building full-stack projects (not just isolated backend) • Handling real-world errors and debugging • Making apps actually work end-to-end 📌 Learning step by step — now things are starting to connect (literally 😄) 🔗 Video: [https://lnkd.in/gmvstDy5] #BackendDevelopment #FullStackDevelopment #NodeJS #CORS #WebDevelopment #LearningInPublic

𝗝𝗮𝘃𝗮𝗦𝗰𝗿𝗶𝗽𝘁 𝗶𝘀𝗻’𝘁 𝘁𝗿𝘂𝗹𝘆 𝗰𝗼𝗻𝗰𝘂𝗿𝗿𝗲𝗻𝘁 — but the Event Loop makes it feel like it is. Most developers use async features daily, yet still get confused when things don’t execute in the order they expect. That confusion usually comes from not understanding what’s actually happening under the hood. 𝗛𝗲𝗿𝗲’𝘀 𝘁𝗵𝗲 𝗿𝗲𝗮𝗹𝗶𝘁𝘆 👇 🔹 𝗖𝗮𝗹𝗹 𝗦𝘁𝗮𝗰𝗸 Everything starts here. JavaScript executes one function at a time — no parallel execution, no magic. If the stack is busy, nothing else runs. 🔹 𝗛𝗲𝗮𝗽 (𝗠𝗲𝗺𝗼𝗿𝘆) Objects, closures, and data live here. Mismanaging this is how you end up with memory leaks — especially in long-running apps. 🔹 𝗪𝗲𝗯 𝗔𝗣𝗜𝘀 (𝗕𝗿𝗼𝘄𝘀𝗲𝗿 / 𝗡𝗼𝗱𝗲 𝗿𝘂𝗻𝘁𝗶𝗺𝗲) Async work doesn’t happen in the engine itself. Timers, network calls, DOM events — they’re offloaded to the runtime environment. 🔹 𝗤𝘂𝗲𝘂𝗲𝘀 (This is where most people mess up) There isn’t just one queue. 𝗠𝗶𝗰𝗿𝗼𝘁𝗮𝘀𝗸 𝗤𝘂𝗲𝘂𝗲 → Promises, async/await 𝗠𝗮𝗰𝗿𝗼𝘁𝗮𝘀𝗸 𝗤𝘂𝗲𝘂𝗲 → setTimeout, setInterval, I/O Microtasks always run before macrotasks. This is why Promise.then() executes before setTimeout(fn, 0). 🔹 𝗘𝘃𝗲𝗻𝘁 𝗟𝗼𝗼𝗽 This isn’t doing the work — it’s coordinating it. It continuously checks: Is the Call Stack empty? If yes → run all microtasks Then → pick one macrotask Repeat That’s the entire scheduling model. 💡 𝗪𝗵𝗮𝘁 𝗮𝗰𝘁𝘂𝗮𝗹𝗹𝘆 𝗺𝗮𝘁𝘁𝗲𝗿𝘀 𝗶𝗻 𝗿𝗲𝗮𝗹 𝗽𝗿𝗼𝗷𝗲𝗰𝘁𝘀   • Async bugs are rarely random — they’re scheduling issues   • Misunderstanding microtasks vs macrotasks leads to race conditions   • “Why did this run first?” → Event Loop is the answer every time   • Performance bottlenecks often come from blocking the Call Stack JavaScript is single-threaded. The Event Loop doesn’t make it parallel — it makes it predictable if you understand it properly. #JavaScript #EventLoop #AsyncJavaScript #WebDevelopment #Frontend #NodeJS #SoftwareEngineering

𝗜 𝗺𝗮𝗱𝗲 𝗺𝘆 𝗰𝗼𝗱𝗲 𝘄𝗼𝗿𝗸... 𝗯𝘂𝘁 𝗻𝗼𝘁 𝗺𝗮𝗶𝗻𝘁𝗮𝗶𝗻𝗮𝗯𝗹𝗲. While working on one of my projects, I decided to move to Appwrite. Initially, I directly used the documentation and plugged the code inside components without thinking much about structure. It worked… until I had to make changes. Shifting things later became messy and difficult to manage. That’s when I realized the problem wasn’t the tool, it was how I structured my code. So I refactored with a better approach: ➯Introduced a Service Wrapper layer to encapsulate all business logic ➯Kept the rest of the application decoupled from the backend provider ➯Centralized configuration and initialization instead of scattering it across components ➯Ensured resources are used efficiently by initializing only when needed ➯Exposed a clean, single interface for the rest of the app to interact with This made the codebase much easier to maintain and flexible enough to switch services in the future if needed. #softwareengineering #webdevelopment #architecture #cleancode #javascript #buildinpublic #developers

When Your API Works… But Your UI Doesn’t Update (React Query Lesson) Today I built a “create-product” to Add products, feature in my Next.js project. I used: - useQuery to fetch products - useMutation to create a new product - router navigation after submission The product was created successfully, but I noticed an issue the UI didn’t update immediately after the mutation. I’m currently digging into how query invalidation and cache updates work in React Query to fix this. Even though it’s not fully resolved yet, it’s teaching me something important: frontend development isn’t just about making things work lit’s about keeping data in sync across the UI. Still learning. Still building. For developers……When debugging issues like this, do you prefer focusing on state management first or network/data flow first? Why? Seeing my posts for the first time? I am Irorere Juliet frontend developer and a builder. I believe in growth, consistency, and showing up even when it’s hard. #Nextjs #ReactQuery #JavaScript #WebDevelopment #FrontendDevelopment #BuildInPublic

I just published a complete guide on setting up Claude Code for frontend development If you're working with React + Tailwind, this one's for you. Here's what's covered: → Installing and configuring Claude Code from scratch → Wiring it into a React + Tailwind project → Getting the most out of AI-assisted component building → Tips that save hours of setup time I've been using it in my own workflow and the difference in speed is hard to ignore — especially for repetitive UI work. Drop a comment if you have questions or want me to cover a specific part in more depth. #ClaudeCode #React #TailwindCSS #FrontendDevelopment #WebDev #AI

I stopped writing messy React code… and my projects became 10x easier to maintain. Here’s what changed 👇 Most developers focus on “making it work.” But clean code is what makes it scalable. One simple habit I adopted: 👉 Extract logic into reusable hooks Instead of this 👇 useEffect(() => { fetch("/api/users") .then(res => res.json()) .then(data => setUsers(data)) .catch(err => console.error(err)); }, []); I now do this 👇 // useFetch.js import { useState, useEffect } from "react"; export function useFetch(url) { const [data, setData] = useState(null); useEffect(() => { fetch(url) .then(res => res.json()) .then(setData) .catch(console.error); }, [url]); return data; } Then use it anywhere 👇 const users = useFetch("/api/users"); 💡 Why this matters: Cleaner components Reusable logic Easier debugging Better scalability Small improvements like this separate average developers from great ones. What’s one coding habit that improved your workflow? #React #JavaScript #CleanCode #WebDevelopment #Frontend

Everything was working… until production said otherwise 😅 One of the trickiest bugs in JavaScript is when your code is technically correct… but finishes in the wrong order. Many developers think: “If I use async/await, I’m safe.” Sadly… no 😄 async/await makes code look clean. It does NOT control which request finishes first. That’s where race conditions begin. Simple example: User searches “React” → Request 1 starts Immediately searches “Node.js” → Request 2 starts If Request 1 finishes later, old data can replace the new result. Now your UI confidently shows… the wrong answer. Classic. Same thing happens in Node.js too: ✔ Multiple API calls updating the same data ✔ Parallel requests overwriting each other ✔ Background jobs fighting like siblings Everything runs. Everything breaks. How to avoid it: ✔ Cancel old requests ✔ Ignore stale responses ✔ Use request IDs ✔ Debounce fast actions ✔ Handle backend concurrency properly Big lesson: async/await is syntax. Correct execution order is architecture. Very different things. Good code is not just: “It runs on my machine.” Good code is: “It runs correctly in production.” 😄 Have you ever debugged a race condition bug that made you question your life choices? 👇 #JavaScript #NodeJS #AsyncAwait #RaceConditions #FrontendDevelopment #BackendDevelopment #SoftwareEngineering #WebDevelopment

𝗥𝗲𝗮𝗰𝘁 𝟮𝟬𝟮𝟲 𝗥𝗼𝗮𝗱𝗺𝗮𝗽: 𝗙𝗿𝗼𝗺 𝗝𝗦 𝘁𝗼 𝗣𝗿𝗼𝗱𝘂𝗰𝘁𝗶𝗼𝗻 Stop asking what React is. Learn what to ship. Modern apps need more than basic hooks. Follow this roadmap in 4 to 12 weeks. Step 1: Modern JavaScript React punishes poor JS skills. Learn these: - ES Modules - Async and await - map, filter, reduce - Destructuring and spread - Immutability - Basic DOM events Task: Build a data dashboard in plain JS. Fetch JSON and render a list. Step 2: Core React Build predictable UI. Focus on: - Props and composition - useState and derived state - useEffect for external sync - Stable keys for lists - Controlled forms - Custom hooks Task: Build a CRUD app for notes or tasks. Step 3: Frameworks Learn why frameworks exist. Study: - Nested routing - Caching and optimistic updates - CSR vs SSR vs streaming - Server Components Task: Build an app skeleton with auth and a dashboard. Step 4: Production Quality Make code maintainable. Use: - TypeScript for props and APIs - Component tests for behavior - Linting for consistency - Code-splitting for speed Task: Add TypeScript and tests to your CRUD app. Build these for your portfolio: - Admin dashboard with filters - Content editor with autosave - E-commerce cart and checkout Learning Tip: Pick one course. Use docs to build. Projects build judgment. Source: https://lnkd.in/g3qmZs6e