Why gem management matters in Ruby - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to install a gem using Bundler.

Ruby

system('bundle [1] rails')

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

Alist

Bupdate

Cremove

Dinstall

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'bundle update' instead of 'bundle install' to add new gems.

The bundle install command installs gems listed in the Gemfile.

2fill in blank

medium

Complete the code to specify a gem version in the Gemfile.

Ruby

gem 'nokogiri', '[1] 1.12.5'

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A>=

B<=

C~>

D==

Attempts:

3 left

💡 Hint

Common Mistakes

Using '==' which locks to an exact version, limiting updates.

The ~> operator specifies a version constraint allowing patch updates.

3fill in blank

hard

Fix the error in the Gemfile line to properly group gems for development and test.

Ruby

group :development[1] :test do
  gem 'rspec-rails'
end

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Aor

B,

C&

Dand

Attempts:

3 left

💡 Hint

Common Mistakes

Using logical operators like 'and' or 'or' instead of commas.

Use a comma to list multiple groups in the group method.

4fill in blank

hard

Fill both blanks to check if a gem is installed and print its version.

Ruby

if Gem::Specification.find_by_name('[1]')
  puts Gem::Specification.find_by_name('[2]').version
end

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Arails

Bnokogiri

Crspec

Dpuma

Attempts:

3 left

💡 Hint

Common Mistakes

Using different gem names in the two places causing errors.

Use the gem name consistently to check and print its version.

5fill in blank

hard

Fill all three blanks to add a gem with a specific version and group it for development only.

Ruby

group :[1] do
  gem '[2]', '[3] 2.3.0'
end

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

Adevelopment

Btest

C~>

Drails

Attempts:

3 left

💡 Hint

Common Mistakes

Putting the gem in the wrong group or using wrong version operators.

Group the gem 'rails' under development with version constraint '~> 2.3.0'.