Lesson 6: React useState and Events: Re-renders, Updater Functions and Lifting State Up

This is where React comes alive. Give components memory with useState, respond to clicks and typing, and understand exactly what happens when state changes. In this lesson (Lesson 6 of 20 in the "React JS: Beginner to Advanced" course) you will learn: Why normal variables are not enough useState and event handlers The render cycle: trigger, render, commit State as a snapshot and updater functions Updating arrays and objects without mutation Derived values instead of extra state Lifting state up to share it YOUR TASK: Build a Like button that toggles and counts, then show three posts each with its own Like button. ------------------------------------------ ABOUT THIS COURSE "React JS: From Beginner to Advanced" is a free, step-by-step video course that takes you from your first component to full-stack, production-ready apps. 20 lessons and 5 real-world projects with React 19, Vite, React Router, TanStack Query, Zustand, Redux Toolkit, React Hook Form, Zod, Tailwind CSS, TypeScript, Vitest, and an ASP.NET Core Web API (.NET 10) back end with JWT and SignalR. Full course playlist:    • React JS Full Course: Beginner to Advanced...   previous Lession 5    • Lesson 5: React Props Explained: Passing D...   Lession 4    • Lesson 4: JSX and Components in React: Rul...   Lession 3    • Lesson 3: React Setup with Vite: Node.js, ...   Lession 2    • Lesson 2: Modern JavaScript for React: Arr...   Lession 1    • Lesson 1: What is React? Components, SPAs ...   AI in asp.net core Full Course Video link English and Hindi English version:    • AI with ASP.NET Core: Full Course for C# D...   Hindi playlist:    • AI with ASP.NET Core Hindi में | C# Develo...   Subscribe for the next lesson, and tell me in the comments what you are building with React! #React #useState #ReactHooks #ReactJS #JavaScript #Frontend