Gem versions and constraints in Ruby - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to specify a gem version exactly 2.1.0.

Ruby

gem 'rails', '[1]'

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

A'>= 2.1.0'

B'= 2.1.0'

C'~> 2.1.0'

D'< 2.1.0'

Attempts:

3 left

💡 Hint

Common Mistakes

Using '~>' instead of '=' for exact version.

Using '>=' which allows newer versions.

Using '= 2.1.0' means the gem version must be exactly 2.1.0.

2fill in blank

medium

Complete the code to allow any version greater than or equal to 1.5 but less than 2.0.

Ruby

gem 'nokogiri', '[1]'

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

A'~> 1.5'

B'= 1.5'

C['>= 1.5', '< 2.0']

D'> 1.5, <= 2.0'

Attempts:

3 left

💡 Hint

Common Mistakes

Using '~> 1.5' which allows versions up to but not including 2.0 but starting at 1.5.x only.

Using '=' which fixes to one version.

The constraint '>= 1.5, < 2.0' means versions from 1.5 up to but not including 2.0 are allowed.

3fill in blank

hard

Fix the error in the version constraint to allow versions starting from 3.0 up to but not including 4.0.

Ruby

gem 'puma', '[1]'

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

A'>= 3.0, < 4.0'

B'= 3.0'

C'~> 3.0'

D'> 3.0, < 4.0'

Attempts:

3 left

💡 Hint

Common Mistakes

Using '~> 3.0' which allows versions starting at 3.0 but less than 4.0 only if minor version is zero.

Using '> 3.0' which excludes version 3.0 itself.

The correct syntax to allow versions from 3.0 up to but not including 4.0 is '>= 3.0, < 4.0'.

4fill in blank

hard

Fill both blanks to specify a gem version that is at least 2.2 but less than 3.0.

Ruby

gem 'devise', '[1]', '[2]'

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

A'>= 2.2'

B'= 2.2'

C'< 3.0'

D'~> 2.2'

Attempts:

3 left

💡 Hint

Common Mistakes

Using '=' which fixes to one version.

Using '~>' which may allow versions outside the intended range.

Using '>= 2.2' and '< 3.0' together means versions from 2.2 up to but not including 3.0 are allowed.

5fill in blank

hard

Fill all three blanks to specify a gem version that is at least 1.8, less than 2.0, and not equal to 1.9.1.

Ruby

gem 'sidekiq', '[1]', '[2]', '[3]'

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

A'>= 1.8'

B'< 2.0'

C'!= 1.9.1'

D'= 1.9.1'

Attempts:

3 left

💡 Hint

Common Mistakes

Using '=' instead of '!=' to exclude a version.

Not excluding the unwanted version.

Using '>= 1.8', '< 2.0', and '!= 1.9.1' means versions from 1.8 up to but not including 2.0 are allowed except version 1.9.1.