Why gem management matters in Ruby - See It in Action

Why gem management matters

📖 Scenario: You are working on a Ruby project that uses external libraries called gems. Managing these gems properly helps keep your project organized and avoids conflicts.

🎯 Goal: You will create a simple Ruby script that lists gems your project uses, sets a version requirement, and shows how to check gem versions. This helps you understand why managing gems is important.

📋 What You'll Learn

Create a hash called gems with gem names and their current versions

Create a variable called required_version to set a minimum version for a gem

Use a loop to check which gems meet the required version

Print the gems that meet the version requirement

💡 Why This Matters

🌍 Real World

Managing gem versions helps avoid bugs and conflicts in Ruby projects by ensuring all parts use compatible libraries.

💼 Career

Ruby developers must manage gems carefully to maintain stable and secure applications, making this skill important for professional coding.

1

Create the gems hash

Create a hash called gems with these exact entries: 'rails' => '7.0.4', 'nokogiri' => '1.13.3', 'puma' => '5.6.4'

Ruby

# Create the gems hash with names and versions
# Your code here

Need a hint?

Use curly braces {} to create a hash with gem names as keys and versions as values.

2

Set the required version

Create a variable called required_version and set it to the string '7.0.0' to represent the minimum version required for gems

Ruby

gems = { 'rails' => '7.0.4', 'nokogiri' => '1.13.3', 'puma' => '5.6.4' }
# Set the required_version variable to '7.0.0'
# Your code here

Need a hint?

Assign the string '7.0.0' to the variable required_version.

3

Check gems against the required version

Use a for loop with variables name and version to iterate over gems. Inside the loop, compare version with required_version using string comparison, and add gems that meet or exceed the required version to an array called valid_gems

Ruby

gems = { 'rails' => '7.0.4', 'nokogiri' => '1.13.3', 'puma' => '5.6.4' }
required_version = '7.0.0'
valid_gems = []
# Use a for loop to check each gem version
# Your code here

Need a hint?

Use for name, version in gems to loop. Use valid_gems << name if version >= required_version to add valid gems.

4

Print the valid gems

Write a puts statement to print the string "Gems meeting version requirement:" and then print the valid_gems array

Ruby

gems = { 'rails' => '7.0.4', 'nokogiri' => '1.13.3', 'puma' => '5.6.4' }
required_version = '7.0.0'
valid_gems = []
for name, version in gems
  valid_gems = required_version
end
# Print the valid gems below
# Your code here

Need a hint?

Use puts to print the message and the array valid_gems.