标签：#React

Read Time: ~14 minutes | Building on React fundamentals to master state management at scale Prerequisites : Familiarity with React basics, useState, useEffect (Part 1) 🔗 Series Navigation ← Part 1: Complete Guide from Zero to Production Part 2: Advanced Hooks & State Management ← YOU ARE HERE → Part 3: Performance Optimization (coming next) 📌 What You'll Learn By the end of this guide, you'll understand: ✅ Creating powerful custom hooks ✅ When and how to use useReducer ✅ Managing state globally with Context API ✅ Redux fundamentals and when to use it ✅ Modern alternatives: Zustand and Jotai ✅ Choosing the right pattern for your project ✅ Real-world shopping cart implementation 🎣 Custom Hooks: Reusing Logic Across Components Custom hooks are regular JavaScript functions that let you extract component logic into reusable functions. They're one of the most powerful React patterns. Rule #1: Custom Hooks Must Start with "use" // ✅ Correct - starts with "use" function useFormInput ( initialValue ) { const [ value , setValue ] = useState ( initialValue ); return { value , bind : { value , onChange : e => setValue ( e . target . value ) }, reset : () => setValue ( initialValue ) }; } // ❌ Wrong - doesn't start with "use" function formInput ( initialValue ) { ... } Example #1: useFormInput Hook import { useState } from ' react ' ; function useFormInput ( initialValue = '' ) { const [ value , setValue ] = useState ( initialValue ); return { value , setValue , bind : { value , onChange : e => setValue ( e . target . value ) }, reset : () => setValue ( initialValue ) }; } // Using the custom hook function LoginForm () { const email = useFormInput ( '' ); const password = useFormInput ( '' ); const handleSubmit = ( e ) => { e . preventDefault (); console . log ( email . value , password . value ); email . reset (); password . reset (); }; return ( < form onSubmit = { handleSubmit } > < input {... email . bind } placeholder = " Email " type = " email " /> < input {... password .

The Redefinition of "Frontend Engineer" in 2026 The era of the frontend engineer as a purely visual specialist is over. In 2026, companies like Vercel, Linear, Figma, Shopify, and major FAANG divisions expect their frontend engineers to think in terms of systems, not just components. A modern frontend engineer must understand rendering pipelines, browser internals, network optimization, and component architecture at the same depth that a backend engineer understands database indexing or API design. This shift is reflected directly in how companies interview frontend candidates. If you walk into a 2026 frontend interview expecting to answer "what's the difference between let and const ," you will be humbled. This guide covers everything you need to know to pass a senior-level frontend interview at a top tech company. Core Web Vitals: The Mandatory Topic You Can't Skip Google's Core Web Vitals have become a standard lens through which senior frontend engineers are evaluated. Interviewers now routinely ask candidates to diagnose performance bottlenecks using CWV metrics. The three primary metrics are: LCP (Largest Contentful Paint): Measures perceived load speed. Target under 2.5 seconds. Optimized via image preloading, server-side rendering, and CDN caching. INP (Interaction to Next Paint): Replaced FID in 2024. Measures responsiveness. Optimized by breaking up long tasks, using web workers, and deferring non-critical JavaScript. CLS (Cumulative Layout Shift): Measures visual stability. Prevents jarring layout shifts by pre-defining dimensions for images, iframes, and dynamic content. Be prepared to walk through a real-world scenario: "Given an LCP score of 4.2s, what is your systematic debugging and optimization approach?" This is now a standard senior frontend interview question. React 19 and the Concurrent Rendering Model React 19 introduced a fully concurrent rendering model that fundamentally changes how components behave. Key concepts interviewers probe in 2026

Today I discovered something I honestly should have explored a long time ago: Google Lighthouse. Funny enough, revamping my portfolio is one of those projects I kept pushing forward with the classic “I’ll do it tomorrow” mindset — and somehow tomorrow kept winning. But today I finally sat down and started improving it, and during that process, I came across Lighthouse. For anyone who hasn’t heard of it yet, Google Lighthouse is an open-source automated tool designed to help developers improve the quality of web pages. You can run it on almost any page — whether it’s public or behind authentication. What immediately caught my attention is that it audits things like: Performance Accessibility SEO Best Practices And probably a few more things I’m still discovering You can run Lighthouse directly inside Chrome DevTools, through the command line, or even as a Node.js module. The process is simple: You give Lighthouse a URL, it scans the page, runs a series of audits, and then generates a detailed report showing how your website performs. What makes it powerful is that it doesn’t just tell you what’s wrong it also explains: _ Why the issue matters How it affects users And how you can fix it _ As a beginner software engineer and developer, I’m slowly realizing that writing code is only one part of building great applications. Performance, accessibility, maintainability, and user experience matter just as much. And honestly, tools like Lighthouse make the learning process feel less overwhelming because they point you in the right direction. One thing I’ll say though don’t fall into the trap of chasing a perfect Lighthouse score instead of building useful projects. A lot of developers start optimizing numbers before validating whether the product itself solves a real problem. Lighthouse is a guide, not the final goal. For my portfolio specifically, Lighthouse exposed a few weaknesses immediately: Large unoptimized images Accessibility issues Slow-loading assets Missing metad

MikuMikuDance still lives mostly on the desktop: PMX models, VMD motion, skirt physics, camera work. We built AnimaStage Lite — an open-source browser studio so you can load assets, preview motion, add FX, and export vertical Shorts without installing MMD. 🔗 Repository: https://github.com/FBNonaMe/animastage-lite 🌐 Live demo: https://animastage-lite.app/ 🎬 Open the studio: https://animastage-lite.app/app Why the browser? Short-form creators need: 9:16 framing and 1080×1920 export Fast PMX + VMD iteration Stable WebGL on everyday laptops AnimaStage Lite is not a full MMD clone — it’s a focused stage : load, animate, light, record. Stack Layer Tech UI React 19 + TypeScript 3D Three.js + React Three Fiber Build Vite 6 Physics Bullet (Ammo.js) HQ video WebCodecs + mp4-muxer Live video MediaRecorder All core features run client-side . What it does Drag & drop PMX/PMD, VMD, textures, HDR Timeline + dopesheet + Bézier curves + VMD export Bullet physics — skirt, hair, accessories RTX Lite — bloom, DOF, weather, style presets MP4 HQ (frame-by-frame) and Live recording Clean capture — no gizmos in the final video 9:16 Lite — lighter render path to reduce WebGL context loss Optional: MediaPipe mocap, Gemini AI keys, Local/WebRTC collab. Try it Online: https://animastage-lite.app/app — drop your PMX + VMD. Locally: bash git clone https://github.com/FBNonaMe/animastage-lite.git cd animastage-lite npm install npm run dev https://animastage-lite.app/ — landing http://localhost:3000/app — studio (local) Optional AI: copy .env.example → .env and set VITE_GEMINI_API_KEY. Open source Star ⭐ the repo, open issues, send PRs: https://github.com/FBNonaMe/animastage-lite MMD models are not bundled — use only content you have rights to publish. What would you use this for — Shorts, VTuber previews, or learning Three.js? Comments welcome. ---