Первая программа на React Native — Запрос к REST API

import { useEffect, useState } from 'react';
import { ActivityIndicator, FlatList, StyleSheet, Text, View } from 'react-native';

export default function PostsScreen() {
  const [posts, setPosts] = useState([]);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState(null);

  useEffect(() => {
    let cancelled = false;
    (async () => {
      try {
        const res = await fetch('https://jsonplaceholder.typicode.com/posts?_limit=10');
        if (!res.ok) throw new Error(`HTTP ${res.status}`);
        const data = await res.json();
        if (!cancelled) setPosts(data);
      } catch (e) {
        if (!cancelled) setError(e.message);
      } finally {
        if (!cancelled) setLoading(false);
      }
    })();
    return () => { cancelled = true; };
  }, []);

  if (loading) {
    return (
      <View style={styles.center}>
        <ActivityIndicator size="large" />
      </View>
    );
  }
  if (error) {
    return (
      <View style={styles.center}>
        <Text>Ошибка: {error}</Text>
      </View>
    );
  }

  return (
    <FlatList
      style={styles.list}
      data={posts}
      keyExtractor={(item) => String(item.id)}
      renderItem={({ item }) => (
        <View style={styles.row}>
          <Text style={styles.title}>{item.title}</Text>
        </View>
      )}
    />
  );
}

const styles = StyleSheet.create({
  center: { flex: 1, justifyContent: 'center', alignItems: 'center' },
  list: { flex: 1, paddingTop: 48 },
  row: { padding: 16, borderBottomWidth: 1, borderBottomColor: '#e5e7eb' },
  title: { fontSize: 14 },
});