RubyGems repository - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to install a gem named 'rails' using RubyGems.

Ruby

system('gem [1] rails')

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

Aupdate

Buninstall

Clist

Dinstall

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'update' instead of 'install' will try to update an existing gem.

Using 'uninstall' removes a gem instead of installing it.

The gem install command installs a gem from the RubyGems repository.

2fill in blank

medium

Complete the code to list all installed gems using RubyGems.

Ruby

system('gem [1]')

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

Alist

Bupdate

Csearch

Dinstall

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'install' tries to add a new gem instead of listing.

Using 'search' looks for gems online, not installed ones.

The gem list command shows all gems installed on your system.

3fill in blank

hard

Fix the error in the code to search for a gem named 'nokogiri' in the RubyGems repository.

Ruby

system('gem [1] nokogiri')

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

Ainstall

Bsearch

Clist

Duninstall

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'install' tries to add the gem instead of searching.

Using 'list' only shows installed gems, not available ones.

The gem search command looks for gems in the RubyGems repository.

4fill in blank

hard

Complete the code to create a hash that maps gem names to their versions for gems with version greater than 2.0.

Ruby

gems = gem_list.each_with_object({}) { |(name, version), h| h[name=>version] = version if version [1] '2.0' }

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

A=>

B>

C<

D:

Attempts:

3 left

💡 Hint

Common Mistakes

Using ':' instead of '=>' for hash mapping.

Using '<' instead of '>' for version comparison.

In Ruby, hashes use h[name => version] to map keys to values within each_with_object({}). The condition checks if version is greater than '2.0'.

5fill in blank

hard

Fill all three blanks to create a hash that maps gem names in uppercase to their versions if version is less than '3.0'.

Ruby

result = gems.each_with_object({}) { |(name, version), h| h[name[1] => version] if version [2] '3.0' and name[3] }

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

A.upcase

B<

C!= ''

D.downcase

Attempts:

3 left

💡 Hint

Common Mistakes

Using '.downcase' instead of '.upcase'.

Using '>=' instead of '<' for version comparison.

Not checking if name is not empty.

The .upcase method converts the gem name to uppercase. The condition checks if version is less than '3.0' and name is not empty.