Expo Go for quick start in React Native - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is Expo Go in React Native development?

Expo Go is a mobile app that lets you run React Native projects instantly on your phone without building native code. It helps you see your app live while coding.

beginner

How does Expo Go simplify starting a React Native app?

Expo Go removes the need to install Android Studio or Xcode first. You just scan a QR code from your development computer and your app runs on your phone immediately.

beginner

Which command starts a new Expo project that works with Expo Go?

You use npx create-expo-app myApp to create a new project ready to run in Expo Go.

intermediate

Can you use Expo Go to test native device features like camera or GPS?

Yes, Expo Go supports many native device features through Expo APIs, so you can test camera, GPS, sensors, and more without extra setup.

intermediate

What is a limitation of using Expo Go for app development?

Expo Go cannot run custom native code or third-party native modules that are not included in Expo. For those, you need to build a custom development client or eject.

What do you need to do to run your React Native app on your phone using Expo Go?

A Build a native APK or IPA file first

B Scan a QR code from the Expo development server

C Install Android Studio on your phone

D Write native Java or Swift code

Expo Go lets you run your app by scanning a QR code from the development server, no need to build native files first.

Which command creates a new Expo project ready for Expo Go?

A npx create-expo-app myApp

B npx create-react-app myApp

C expo init myApp

D react-native init myApp

The command npx create-expo-app myApp creates a new Expo project compatible with Expo Go.

What is a key benefit of using Expo Go for beginners?

A No need to install native SDKs like Xcode or Android Studio

B You can write native Java and Swift code directly

C It automatically publishes your app to app stores

D It replaces the need for React Native

Expo Go removes the need to install native SDKs, making it easier for beginners to start coding quickly.

Which of these is NOT supported directly by Expo Go?

A Live reloading your app during development

B Accessing GPS location

C Using device camera

D Running custom native modules not included in Expo

Expo Go cannot run custom native modules that are not part of the Expo SDK.

How does Expo Go help with app testing?

A It automatically fixes code errors

B It compiles your app into a final store-ready package

C It lets you see changes instantly on your phone as you code

D It replaces the need for physical devices

Expo Go supports live reloading so you can see your app update instantly on your phone.

Explain how Expo Go makes starting React Native development easier for beginners.

Think about what setup steps Expo Go removes.

Describe a limitation of Expo Go and how developers can work around it.

Consider what happens if you need native code not in Expo.