Environment setup (Node, Watchman, Xcode, Android Studio) in React Native - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to check the installed Node.js version in your terminal.

React Native

node [1]

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

A-v

B--version

Cversion

D-version

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'node version' instead of a flag.

Using '--version' which is valid but longer.

Use node -v to quickly see the Node.js version installed on your system.

2fill in blank

medium

Complete the command to install Watchman on macOS using Homebrew.

React Native

brew [1] watchman

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

Aupdate

Binstall

Cupgrade

Dremove

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'brew update watchman' which updates Homebrew itself.

Using 'brew remove watchman' which uninstalls the package.

Use brew install watchman to install Watchman on macOS.

3fill in blank

hard

Fix the error in the command to open Xcode from the terminal.

React Native

[1] /Applications/Xcode.app

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

Arun

Bstart

Copen

Dlaunch

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'start' which works on Windows but not macOS.

Using 'launch' or 'run' which are not valid commands.

Use open /Applications/Xcode.app to launch Xcode from the terminal on macOS.

4fill in blank

hard

Fill both blanks to set ANDROID_HOME environment variable in macOS terminal.

React Native

export [1]=[2]/Library/Android/sdk

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

AANDROID_HOME

BANDROID_SDK

C$HOME

D~

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'ANDROID_SDK' instead of 'ANDROID_HOME'.

Using '~' instead of '$HOME'.

Set ANDROID_HOME to the Android SDK path using $HOME for the user directory.

5fill in blank

hard

Fill all three blanks to add Android platform tools to PATH in macOS terminal.

React Native

export PATH=[1]/bin:[2]/platform-tools:[3]

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

A$PATH

B$HOME

D$ANDROID_HOME

Attempts:

3 left

💡 Hint

Common Mistakes

Not including existing PATH in the new PATH variable.

Using literal paths instead of variables.

Use $HOME for home directory, $ANDROID_HOME for SDK path, and $PATH to keep existing PATH entries.

Practice

1. Which tool do you need to install to run JavaScript code outside a web browser when setting up React Native?

easy

A. Xcode

B. Watchman

C. Android Studio

D. Node.js

Solution

1. Step 1: Understand the role of Node.js

   Node.js allows running JavaScript code on your computer, outside the browser, which is essential for React Native development.

2. Step 2: Identify other tools' purposes

   Watchman watches file changes, Xcode is for iOS apps, and Android Studio is for Android apps, but none run JavaScript directly.

3. Final Answer:

   Node.js -> Option D

4. Quick Check:

   JavaScript runtime = Node.js [OK]

Hint: Node.js runs JavaScript outside browsers [OK]

Common Mistakes:

• Confusing Watchman as JavaScript runtime
• Thinking Xcode runs JavaScript
• Assuming Android Studio runs JavaScript

2. Which command correctly checks the installed version of Watchman on macOS?

easy

A. xcodebuild -version

B. node -v

C. watchman --version

D. android-studio --version

Solution

1. Step 1: Identify the command for Watchman version

   The command to check Watchman version is watchman --version.

2. Step 2: Recognize other commands check different tools

   node -v checks Node.js, xcodebuild -version checks Xcode, and android-studio --version is not a valid command.

3. Final Answer:

   watchman --version -> Option C

4. Quick Check:

   Watchman version command = watchman --version [OK]

Hint: Watchman version uses watchman --version [OK]

Common Mistakes:

• Using node -v for Watchman
• Trying android-studio --version (invalid)
• Using xcodebuild -version for Watchman

3. What will be the output of the command xcodebuild -version after installing Xcode correctly?

medium

A. watchman version 4.9.0

B. Xcode 14.3
Build version 14E222b

C. Node.js v18.12.1

D. Android Studio 2022.1.1

Solution

1. Step 1: Understand the command output

   The command xcodebuild -version outputs the Xcode version and build number.

2. Step 2: Match output to correct tool

   Output mentioning "Xcode" and build version matches Xcode, others show versions of different tools.

3. Final Answer:

   Xcode 14.3\nBuild version 14E222b -> Option B

4. Quick Check:

   Xcode version command output = Xcode 14.3 Build version 14E222b [OK]

Hint: Xcode version shows 'Xcode' and build number [OK]

Common Mistakes:

• Confusing Node.js version output with Xcode
• Mixing Watchman output with Xcode
• Expecting Android Studio output from xcodebuild

4. You run node -v but get an error saying command not found. What is the most likely cause?

medium

A. Node.js is not installed or not added to PATH

B. Watchman is not running

C. Xcode is not installed

D. Android Studio is outdated

Solution

1. Step 1: Analyze the error message

   "command not found" means the system cannot find the node command, usually because Node.js is missing or PATH is incorrect.

2. Step 2: Eliminate unrelated causes

   Watchman, Xcode, and Android Studio do not affect the node command availability.

3. Final Answer:

   Node.js is not installed or not added to PATH -> Option A

4. Quick Check:

   Command not found = missing Node.js or PATH issue [OK]

Hint: Command not found means missing install or PATH error [OK]

Common Mistakes:

• Assuming Watchman affects node command
• Thinking Xcode installation affects node
• Blaming Android Studio for node errors

5. You want to develop a React Native app for both iOS and Android. Which combination of tools must you install and verify?

hard

A. Node.js, Watchman, Xcode, Android Studio

B. Node.js, Xcode only

C. Watchman, Android Studio only

D. Xcode and Android Studio only

Solution

1. Step 1: Identify tools needed for iOS and Android

   Xcode is required for iOS development, Android Studio for Android, Node.js to run JavaScript, and Watchman to watch file changes on macOS.

2. Step 2: Confirm all tools for full setup

   To develop for both platforms, all four tools must be installed and verified.

3. Final Answer:

   Node.js, Watchman, Xcode, Android Studio -> Option A

4. Quick Check:

   All tools for iOS and Android = Node.js, Watchman, Xcode, Android Studio [OK]

Hint: All four tools needed for full React Native setup [OK]

Common Mistakes:

• Skipping Watchman on macOS
• Installing only Xcode or Android Studio
• Forgetting Node.js is essential