useState in react

useState

import { useState } from "react";

export default function App() {
  const [products, setProducts] = useState([
    { name: "product 1", price: 100.0 },
    { name: "product 2", price: 200.0 },
    { name: "product 2", price: 200.0 },
  ]);
  const addProduct = () => {
    setProducts((prevState) => [
      ...prevState,
      {
        name: "product " + (prevState.length + 1),
        price: prevState.length * 100 + 100,
      },
    ]);
  };
  return (
    <>
      <h1>Products</h1>
      <ul>
        {products.map((p, i) => (
          <li key={i}>
            {p.name} - {p.price}
          </li>
        ))}
      </ul>
      <button onClick={addProduct}>Add Product</button>
    </>
  );
}