10. Platform-specific code

The `Platform` module lets code branch by OS, and file extensions like `Button.ios.tsx`/`Button.android.tsx` let the bundler pick the right file automatically.

import { Platform, StyleSheet } from "react-native";

const styles = StyleSheet.create({
  shadow: Platform.select({
    ios: { shadowOpacity: 0.2, shadowRadius: 4 },
    android: { elevation: 4 },
  }),
});

console.log(Platform.OS); // "ios" | "android"

Shadows are a classic divergence: iOS uses `shadow*` properties while Android uses `elevation`, so `Platform.select` is the idiomatic way to supply both.

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