How do you update state in React?

Short answer: Functional component: Use setState from useState. Class component: Use this.setState(). ✅ Example: const [name, setName] = useState("John"); setName("Doe");

Example code

Functional component: Use setState from useState. Class component: Use this.setState(). ✅ Example: const [name, setName] = useState("John"); setName("Doe");

Real-world example (ShopNest)

ProductCard receives price via props. The parent Catalog owns selected filters in state and passes them down.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.