Node.js installation and version management in Node.js - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Understanding Node.js Version Managers

Which of the following statements about Node.js version managers is correct?

A nvm allows you to install and switch between multiple Node.js versions on the same machine.

B nvm is a built-in Node.js command that updates Node.js automatically.

C nvm installs Node.js globally and does not support multiple versions.

D nvm is a package manager like npm used to install Node.js packages.

💡 Hint

Think about how developers manage different Node.js versions for different projects.

nvm (Node Version Manager) is a tool that lets you install and switch between multiple Node.js versions easily on the same computer.

📝 Syntax

intermediate

Correct Command to Install Node.js Version 18 Using nvm

Which command correctly installs Node.js version 18 using nvm?

A nvm install 18

B nvm use 18

C nvm setup 18

D nvm get 18

💡 Hint

Installing a version is different from switching to it.

The command nvm install 18 downloads and installs Node.js version 18. The nvm use 18 command switches to a version already installed.

❓ component_behavior

advanced

Behavior of Node.js Version After Switching with nvm

After running nvm install 16 and then nvm use 16, what will node -v output?

A v14.x.x (the default system Node.js version)

B v18.x.x (the latest Node.js version)

C Error: Node.js version not found

D v16.x.x (the exact installed version 16)

💡 Hint

The nvm use command sets the active Node.js version for the terminal session.

After installing and switching to version 16, node -v shows the exact version 16 installed.

🔧 Debug

advanced

Why Does 'node -v' Show a Different Version After Using nvm?

You installed Node.js 18 using nvm and ran nvm use 18. But running node -v still shows version 14. What is the most likely cause?

A The terminal session was not restarted or reloaded after running <code>nvm use 18</code>.

B Node.js 18 was not installed correctly by nvm.

C The <code>node</code> command is aliased to version 14 in your shell configuration.

D nvm does not support switching Node.js versions on your operating system.

💡 Hint

Check if your shell has any aliases or PATH settings overriding nvm.

If node is aliased or the PATH prioritizes another Node.js installation, node -v will show that version despite using nvm.

❓ state_output

expert

Result of Running Multiple nvm Commands Sequentially

Given the following commands run in order:
nvm install 14
nvm install 18
nvm use 14
node -v
What is the output of node -v?

A v18.x.x (Node.js version 18 active)

B v14.x.x (Node.js version 14 active)

C Error: No Node.js version active

D v16.x.x (some other version)

💡 Hint

The last nvm use command sets the active version.

After installing versions 14 and 18, the command nvm use 14 activates version 14, so node -v outputs version 14.

Practice

1. What is the main purpose of using nvm when working with Node.js?

easy

A. To update npm packages automatically

B. To write JavaScript code faster

C. To run Node.js programs without installation

D. To install and switch between different Node.js versions easily

Solution

1. Step 1: Understand what nvm does

   nvm stands for Node Version Manager and helps manage multiple Node.js versions on one machine.

2. Step 2: Identify the correct purpose

   It allows installing, switching, and managing different Node.js versions easily, unlike writing code or running programs without installation.

3. Final Answer:

   To install and switch between different Node.js versions easily -> Option D

4. Quick Check:

   Node Version Manager = install and switch versions [OK]

Hint: Remember nvm = Node Version Manager for versions [OK]

Common Mistakes:

• Thinking nvm runs Node.js programs directly
• Confusing nvm with npm package manager
• Assuming nvm updates npm packages

2. Which command correctly shows the installed Node.js version in your terminal?

easy

A. node -v

B. npm -v

C. node version

D. nvm version

Solution

1. Step 1: Recall the command to check Node.js version

   The standard command to check Node.js version is node -v.

2. Step 2: Differentiate from other commands

   npm -v shows npm version, node version causes an error (treats 'version' as a script), and nvm version is not a standard command.

3. Final Answer:

   node -v -> Option A

4. Quick Check:

   Check Node.js version = node -v [OK]

Hint: Use node -v to check Node.js version quickly [OK]

Common Mistakes:

• Using npm -v to check Node.js version
• Typing nvm version which is invalid
• Trying node version without flags

3. After installing Node.js version 18 using nvm install 18 and running nvm use 18, what will node -v output?

medium

A. Command not found error

B. v18.x.x (where x.x is the latest patch version installed)

C. v16.x.x (previous default version)

D. v20.x.x (latest Node.js version)

Solution

1. Step 1: Understand nvm install 18 and nvm use 18

   This installs Node.js version 18 and switches the active version to 18.

2. Step 2: Predict node -v output after switching

   Since version 18 is active, node -v will show version 18 with its patch number, like v18.15.0.

3. Final Answer:

   v18.x.x (where x.x is the latest patch version installed) -> Option B

4. Quick Check:

   Active Node.js version = 18 after nvm use 18 [OK]

Hint: nvm use sets active version; node -v shows it [OK]

Common Mistakes:

• Expecting previous or latest version instead of 18
• Thinking nvm use doesn't change active version
• Confusing npm version with node version

4. You run nvm use 14 but get an error: version '14' not installed. What is the most likely fix?

medium

A. Run nvm install 14 to install Node.js version 14 first

B. Restart your computer and try again

C. Update npm to the latest version

D. Run node use 14 instead

Solution

1. Step 1: Understand the error message

   The error means Node.js version 14 is not installed yet on your system.

2. Step 2: Fix by installing the missing version

   You must install version 14 first using nvm install 14 before switching to it.

3. Final Answer:

   Run nvm install 14 to install Node.js version 14 first -> Option A

4. Quick Check:

   Install missing version before using it [OK]

Hint: Install version before using it with nvm [OK]

Common Mistakes:

• Trying to use a version without installing
• Restarting computer won't fix missing version
• Confusing npm update with Node.js version install

5. You want to run a project that requires Node.js version 16, but your system has version 18 active. Using nvm, which sequence of commands correctly sets up the environment?

hard

A. node -v 16 && nvm use 16

B. nvm use 16 && nvm install 16

C. nvm install 16 && nvm use 16

D. npm install 16 && nvm use 16

Solution

1. Step 1: Install Node.js version 16 if not installed

   Use nvm install 16 to download and install version 16.

2. Step 2: Switch active Node.js version to 16

   Use nvm use 16 to activate version 16 for your terminal session.

3. Final Answer:

   nvm install 16 && nvm use 16 -> Option C

4. Quick Check:

   Install then use version 16 with nvm [OK]

Hint: Always install before using a Node.js version [OK]

Common Mistakes:

• Trying to use before installing
• Using node or npm commands incorrectly
• Switching versions without installation