Expo vs bare React Native - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the Expo component correctly.

React Native

import { [1] } from 'expo-camera';

Drag options to blanks, or click blank then click option'

AView

BText

CCamera

DButton

Attempts:

3 left

💡 Hint

Common Mistakes

Importing View or Text from Expo instead of React Native.

The Camera component is imported from expo-camera to use device camera features easily.

2fill in blank

medium

Complete the code to start a bare React Native project using the CLI command.

React Native

npx react-native [1] MyApp

Drag options to blanks, or click blank then click option'

Ainit

Bstart

Crun

Dcreate

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'start' or 'run' instead of 'init' to create a project.

The init command initializes a new bare React Native project.

3fill in blank

hard

Fix the error in the code to import React Native components in a bare project.

React Native

import [1] from 'react-native';

Drag options to blanks, or click blank then click option'

A{ View, Text }

BView, Text

C(View, Text)

D[View, Text]

Attempts:

3 left

💡 Hint

Common Mistakes

Omitting curly braces or using wrong brackets in import statement.

React Native components must be imported using curly braces for named imports.

4fill in blank

hard

Fill both blanks to complete the Expo managed workflow command and its purpose.

React Native

expo [1] && expo [2]

Drag options to blanks, or click blank then click option'

Astart

Bbuild

Cinit

Dpublish

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing build or publish commands instead of init and start.

expo init creates a new Expo project, and expo start runs the development server.

5fill in blank

hard

Fill the blanks to complete the bare React Native app setup commands.

React Native

npx react-native [1] MyApp && cd MyApp && npx react-native [2]-ios

Drag options to blanks, or click blank then click option'

Ainit

Brun

Cstart

Dbuild

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'build' instead of 'run' or 'start' commands.

init creates the project, run-ios launches the app on iOS simulator.

Practice

1. Which statement best describes Expo in React Native development?

easy

A. Expo provides an easy setup with many built-in tools and services.

B. Expo requires manual linking of native modules for every feature.

C. Expo does not support running apps on physical devices.

D. Expo is only for web development, not mobile apps.

Solution

1. Step 1: Understand Expo's purpose

   Expo is designed to simplify React Native development by providing many built-in tools and services out of the box.

2. Step 2: Compare with other options

   Unlike bare React Native, Expo does not require manual linking of native modules and supports running apps on physical devices easily.

3. Final Answer:

   Expo provides an easy setup with many built-in tools and services. -> Option A

4. Quick Check:

   Expo = Easy setup and built-in tools [OK]

Hint: Expo means easy start with many tools included [OK]

Common Mistakes:

• Thinking Expo requires manual native code linking
• Believing Expo can't run on real devices
• Confusing Expo with web-only frameworks

2. Which of the following is the correct way to start a new Expo project?

easy

A. npx react-native init MyApp

B. react-native run-ios

C. npm create-react-app MyApp

D. expo init MyApp

Solution

1. Step 1: Identify Expo project creation command

   The command expo init MyApp is used to create a new Expo project with templates and setup.

2. Step 2: Differentiate from bare React Native commands

   npx react-native init is for bare React Native, not Expo. Other options are unrelated or for web.

3. Final Answer:

   expo init MyApp -> Option D

4. Quick Check:

   Expo project start = expo init [OK]

Hint: Expo projects start with 'expo init' command [OK]

Common Mistakes:

• Using 'npx react-native init' for Expo projects
• Confusing React web commands with React Native
• Trying to run iOS build command before project creation

3. What will happen if you try to use a native module not supported by Expo in an Expo managed project?

medium

A. The app will build and run without errors.

B. You will get a build error or runtime crash.

C. Expo automatically adds support for all native modules.

D. The app will silently ignore the native module.

Solution

1. Step 1: Understand Expo's native module support

   Expo supports many native modules but not all. Unsupported modules cause build or runtime errors.

2. Step 2: Predict behavior when using unsupported modules

   Since Expo does not allow custom native code in managed workflow, using unsupported native modules leads to errors.

3. Final Answer:

   You will get a build error or runtime crash. -> Option B

4. Quick Check:

   Unsupported native module in Expo = error [OK]

Hint: Unsupported native modules cause errors in Expo [OK]

Common Mistakes:

• Assuming Expo adds all native modules automatically
• Thinking unsupported modules are ignored silently
• Believing Expo supports all bare React Native features

4. You have a React Native app created with Expo but need to add custom native code. What is the best way to fix this?

medium

A. Eject the Expo project to bare React Native workflow.

B. Keep using Expo and add native code directly.

C. Rewrite the app using React web instead.

D. Use Expo's managed workflow without changes.

Solution

1. Step 1: Identify the limitation of Expo managed workflow

   Expo managed workflow does not allow adding custom native code directly.

2. Step 2: Choose the correct approach to add native code

   Ejecting the Expo project converts it to bare React Native, allowing full native code access.

3. Final Answer:

   Eject the Expo project to bare React Native workflow. -> Option A

4. Quick Check:

   Need native code? Eject Expo [OK]

Hint: Eject Expo to add custom native code [OK]

Common Mistakes:

• Trying to add native code in Expo managed workflow
• Ignoring the need to eject before native code
• Switching to React web instead of native

5. You want to build a complex app with custom native modules and full control over build tools. Which approach is best?

hard

A. Build a web app instead of a mobile app.

B. Use Expo managed workflow for faster development.

C. Start with bare React Native to access native code freely.

D. Use Expo and avoid any native code.

Solution

1. Step 1: Analyze app requirements

   The app needs custom native modules and full control over build tools, which Expo managed workflow limits.

2. Step 2: Choose the suitable React Native approach

   Bare React Native allows direct native code access and full control over build configurations, fitting the requirements.

3. Final Answer:

   Start with bare React Native to access native code freely. -> Option C

4. Quick Check:

   Custom native + control = bare React Native [OK]

Hint: Complex native needs? Choose bare React Native [OK]

Common Mistakes:

• Choosing Expo for apps needing custom native code
• Confusing web apps with native mobile apps
• Avoiding bare React Native despite native needs