Ruby version management (rbenv, rvm) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to check the current Ruby version using rbenv.

Ruby

system('rbenv [1]')

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

Ainstall

Bversion

Cglobal

Dlocal

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'install' instead of 'version' will try to install Ruby.

Using 'global' or 'local' changes the version but does not display it.

The command rbenv version shows the current Ruby version in use.

2fill in blank

medium

Complete the code to install Ruby version 3.1.2 using rvm.

Ruby

rvm [1] 3.1.2

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

Ainstall

Bremove

Clist

Duse

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'use' switches versions but does not install.

Using 'list' shows installed versions but does not install.

Using 'remove' deletes a version.

The command rvm install 3.1.2 installs Ruby version 3.1.2.

3fill in blank

hard

Fix the error in the command to set Ruby 2.7.4 as the global version using rbenv.

Ruby

rbenv [1] 2.7.4

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

Aglobal

Blocal

Cinstall

Dversion

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'install' tries to install Ruby instead of setting it.

Using 'local' sets version only for current directory.

Using 'version' shows the current version but does not set it.

The command rbenv global 2.7.4 sets Ruby 2.7.4 as the global default version.

4fill in blank

hard

Fill both blanks to list all installed Ruby versions and then switch to version 3.0.0 using rvm.

Ruby

rvm [1]
rvm [2] 3.0.0

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

Alist

Buse

Cinstall

Dremove

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'install' instead of 'list' to see versions.

Using 'remove' instead of 'use' to switch versions.

rvm list shows installed Ruby versions.
rvm use 3.0.0 switches to Ruby 3.0.0.

5fill in blank

hard

Fill all three blanks to create a .ruby-version file with Ruby 2.6.8 and then verify the version with rbenv.

Ruby

echo [1] > .ruby-version
rbenv [2]
rbenv [3]

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

A"2.6.8"

Bversion

Crehash

Dglobal

Attempts:

3 left

💡 Hint

Common Mistakes

Not quoting the version string in echo.

Skipping 'rehash' after changing versions.

Using 'global' instead of 'version' to check current version.

Write the version string "2.6.8" to .ruby-version.
Run rbenv rehash to update shims.
Check current version with rbenv version.

Practice

1. What is the main purpose of using Ruby version managers like rbenv or rvm?

easy

A. To debug Ruby code automatically

B. To write Ruby code faster

C. To compile Ruby programs into executables

D. To switch between different Ruby versions easily

Solution

1. Step 1: Understand Ruby version managers

   Ruby version managers like rbenv and rvm allow you to install and switch between multiple Ruby versions on the same machine.

2. Step 2: Identify the main use

   The main use is to switch Ruby versions easily without affecting other projects or the system Ruby.

3. Final Answer:

   To switch between different Ruby versions easily -> Option D

4. Quick Check:

   Ruby version managers help switch versions = D [OK]

Hint: Remember: rbenv and rvm manage Ruby versions [OK]

Common Mistakes:

• Thinking they speed up coding
• Confusing with debugging tools
• Assuming they compile Ruby code

2. Which of the following commands correctly sets the global Ruby version to 3.1.2 using rbenv?

easy

A. rbenv global 3.1.2

B. rbenv use 3.1.2

C. rbenv set 3.1.2

D. rbenv switch 3.1.2

Solution

1. Step 1: Recall rbenv commands

   The command to set the global Ruby version in rbenv is rbenv global <version>.

2. Step 2: Match the correct command

   Among the options, only rbenv global 3.1.2 correctly sets the global version.

3. Final Answer:

   rbenv global 3.1.2 -> Option A

4. Quick Check:

   Set global version = rbenv global [OK]

Hint: Use 'rbenv global' to set Ruby version globally [OK]

Common Mistakes:

• Using 'rbenv use' which is invalid
• Confusing 'set' or 'switch' commands
• Not specifying the version number

3. Given the following commands run in order:
rbenv install 3.0.0
rbenv local 3.0.0
ruby -v
What will be the output of ruby -v?

medium

A. ruby 2.7.0 (system default)

B. Command not found error

C. ruby 3.0.0 (installed version)

D. ruby 3.1.0 (latest version)

Solution

1. Step 1: Understand the commands

   rbenv install 3.0.0 installs Ruby 3.0.0. rbenv local 3.0.0 sets the Ruby version to 3.0.0 for the current directory.

2. Step 2: Predict the ruby version output

   Running ruby -v in that directory will use Ruby 3.0.0, showing its version.

3. Final Answer:

   ruby 3.0.0 (installed version) -> Option C

4. Quick Check:

   Local version set to 3.0.0 means ruby -v shows 3.0.0 [OK]

Hint: Local version overrides system Ruby version [OK]

Common Mistakes:

• Assuming system default Ruby is used
• Expecting latest Ruby version output
• Thinking command will fail without global set

4. You run rvm use 2.7.0 but get the error: RVM is not a function, selecting rubies with 'rvm use ...' will not work.
What is the most likely cause?

medium

A. RVM is not installed

B. You did not load RVM as a shell function

C. Ruby 2.7.0 is not installed

D. You need to restart your computer

Solution

1. Step 1: Understand the error message

   The error says 'RVM is not a function', which means the shell does not recognize RVM commands properly.

2. Step 2: Identify cause

   This usually happens if the RVM script is not sourced in the shell, so RVM commands are not loaded as functions.

3. Final Answer:

   You did not load RVM as a shell function -> Option B

4. Quick Check:

   Load RVM script in shell to fix 'not a function' error [OK]

Hint: Always source RVM script in your shell config [OK]

Common Mistakes:

• Assuming RVM is not installed at all
• Thinking Ruby version is missing
• Restarting computer unnecessarily

5. You want to create a project that uses Ruby 3.2.0 but your system default is Ruby 2.6.3. Using rbenv, which sequence of commands correctly sets up your project to use Ruby 3.2.0 locally without affecting other projects?

hard

A. rbenv install 3.2.0rbenv local 3.2.0

B. rbenv local 3.2.0rbenv install 3.2.0

C. rbenv install 3.2.0rbenv global 3.2.0

D. rbenv global 3.2.0rbenv install 3.2.0

Solution

1. Step 1: Install Ruby 3.2.0 first

   You must install Ruby 3.2.0 before using it. So rbenv install 3.2.0 is first.

2. Step 2: Set local version for project

   To use Ruby 3.2.0 only in the project folder, use rbenv local 3.2.0. This does not affect other projects or the global version.

3. Final Answer:

   rbenv install 3.2.0
   rbenv local 3.2.0 -> Option A

4. Quick Check:

   Install then set local version for project isolation [OK]

Hint: Install Ruby first, then set local version for project [OK]

Common Mistakes:

• Setting global version instead of local
• Setting local version before installing Ruby
• Assuming global affects only one project