React Native Technology & Digital Applications 3

Question 1

In React Native, what is the role of the Metro bundler?

Accepted Answer

It transforms and bundles JavaScript source files for the app at development and build time

Answer

Metro is the JavaScript bundler used by React Native to resolve modules, transform code, and produce the JS bundle served to the app.

Question 2

What is the correct way to apply platform-specific code in React Native?

Accepted Answer

Use Platform.OS or Platform.select(), or create files with .ios.js / .android.js extensions

Answer

React Native offers Platform.OS checks, Platform.select(), and file extension–based splitting (.ios.js/.android.js) for platform-specific logic.

Question 3

Which prop on a FlatList improves scroll performance by recycling list item views?

Accepted Answer

removeClippedSubviews

Answer

removeClippedSubviews unmounts views that scroll off-screen, reducing the number of active native views and improving performance.

Question 4

What is the function of `react-native link` (or autolinking in RN 0.60+)?

Accepted Answer

It connects native module code in third-party libraries to the iOS and Android build systems

Answer

Autolinking (introduced in RN 0.60) automatically registers native modules from node_modules into the Xcode and Gradle build without manual configuration.

Question 5

Which built-in React Native component should you use to display images from both local and remote sources?

Accepted Answer

Image

Answer

The Image component handles local (require()) and remote (uri) sources and provides props for resizeMode and caching behavior.

React Native Practice Test

React Native Practice Test

React Native Technology & Digital Applications 3