Sepet

import React, { createContext, useContext, useState } from 'react';
import { FlatList, Text, View } from 'react-native';

const products = [
  { id: '1', name: 'Kalem', price: 20 },
  { id: '2', name: 'Defter', price: 35 },
]

const CartContext = createContext();

function CartProvider({ children }) {
  const [cart, setCart] = useState([]);
  const addToCart = (item) => setCart([...cart, item]);
  return (
    <CartContext.Provider value={{ cart, addToCart }}>
      {children}
    </CartContext.Provider>
  );
}

export default function App() {
  const [selectedId, setSelectedId] = useState(null);
  const selected = products.find((p) => p.id === selectedId);
  if (selected) {
    return (
      <View>
        <Text>{selected.name}</Text>
        <Text onPress={() => setSelectedId(null)}>Geri</Text>
      </View>
    );
  }
  return (
    <View>
      <Text>Mağaza</Text>
      <FlatList
        data={products}
        keyExtractor={(item) => item.id}
        renderItem={({ item }) => (
          <Text onPress={() => setSelectedId(item.id)}>{item.name}</Text>
        )}
      />
    </View>
  );
}