P4.1: JSX and Virtual DOM
React is a JavaScript library for building user interfaces. It uses JSX and a Virtual DOM to make UI updates fast.
1. Virtual DOM Mechanics
React maintains a lightweight virtual copy of the HTML page in memory. When state changes, it compares the virtual representation with the real page (Diffing) and updates only the modified elements.
Dan AbramovView Profile 🔗
Real-World Developer Case Study RoleReact Core Developer
Salary₹70 Lakhs/yr equivalent
CompanyMeta / React Core Team
Core Tech Stack
ReactReduxVirtual DOM DiffingHooks
“JSX looks like HTML but it compiles down to standard React.createElement function calls. Remember to always return exactly one root wrapper element!”
🎓 Practice Assignment
- Explore a basic React starter template.
- Verify in Chrome DevTools that JSX renders clean HTML5 elements.