Alert

import { Alert } from 'react-native';

Alert.alert(title, message, buttons, options);

type AlertButton = {
  text?: string;
  onPress?: (value?: string) => void;
  isPreferred?: boolean; // iOS only
  style?: 'default' | 'cancel' | 'destructive'; // iOS only
};

Alert.prompt(title, message, callbackOrButtons, type, defaultValue, keyboardType, options);

import { Alert, Button } from 'react-native';

const showAlert = () => {
  Alert.alert(
    'Alert Title',
    'This is an alert message',
  );
};

<Button title="Show Alert" onPress={showAlert} />

Alert.alert(
  'Delete Item',
  'Are you sure you want to delete this item?',
  [
    {
      text: 'Cancel',
      onPress: () => console.log('Cancel Pressed'),
      style: 'cancel',
    },
    {
      text: 'Delete',
      onPress: () => console.log('Delete Pressed'),
      style: 'destructive',
    },
  ],
);

Alert.prompt(
  'Enter your name',
  'What is your name?',
  (text) => console.log('You entered:', text),
  'plain-text',
  'Default Name',
);

Alert.prompt(
  'Login',
  'Enter your credentials',
  [
    {
      text: 'Cancel',
      style: 'cancel',
    },
    {
      text: 'Login',
      onPress: ({ login, password }) => {
        console.log('Login:', login);
        console.log('Password:', password);
      },
    },
  ],
  'login-password',
);

Alert.alert(
  'Update Available',
  'A new version is available. Update now?',
  [
    { text: 'Later', onPress: () => console.log('Later pressed') },
    { text: 'Cancel', style: 'cancel' },
    { text: 'Update', onPress: () => console.log('Update pressed') },
  ],
  {
    cancelable: true,
    onDismiss: () => console.log('Alert dismissed'),
  },
);

// iOS: All buttons displayed vertically
// Android: 2 buttons side-by-side, 3rd button on new line

Alert.alert(
  'Three Button Alert',
  'Button positioning varies by platform',
  [
    { text: 'Ask me later' },  // Android: Neutral
    { text: 'Cancel' },         // Android: Negative  
    { text: 'OK' },             // Android: Positive
  ],
);