Gemfile for project dependencies in Ruby - Mini Project: Build & Apply

Gemfile for project dependencies

📖 Scenario: You are starting a new Ruby project and need to manage the libraries (called gems) your project will use. Ruby uses a file named Gemfile to list these dependencies so they can be installed easily.

🎯 Goal: Create a Gemfile that lists specific gems your project needs, then add a Ruby version requirement, and finally print the list of gems to confirm your setup.

📋 What You'll Learn

Create a Gemfile with exact gem entries

Add a Ruby version requirement in the Gemfile

Use Ruby code to read and print the gem names from the Gemfile

💡 Why This Matters

🌍 Real World

Managing project dependencies with a Gemfile is essential for Ruby projects to ensure consistent environments and easy setup.

💼 Career

Ruby developers and DevOps engineers use Gemfiles daily to manage libraries and maintain project stability.

1

Create a Gemfile with gems

Create a file named Gemfile and add these exact gem entries:
gem 'rails', '7.0.4', gem 'puma', '5.6.4', and gem 'nokogiri', '1.14.4'.

Ruby

# Create a Gemfile with the specified gems
# Your code here

Need a hint?

Start your Gemfile with source 'https://rubygems.org' then add each gem line exactly as shown.

2

Add Ruby version requirement

Add the exact line ruby '3.2.2' at the top of the Gemfile to specify the Ruby version your project uses.

Ruby

# Add the Ruby version requirement at the top
# Your code here

Need a hint?

The Ruby version line should be the very first line in the Gemfile.

3

Read gem names from Gemfile

Write Ruby code that reads the Gemfile and creates a list called gem_names containing only the gem names as strings (e.g., 'rails', 'puma', 'nokogiri'). Use File.readlines('Gemfile') and string methods to extract the names.

Ruby

# Read Gemfile and extract gem names into gem_names list
# Your code here

Need a hint?

Use map to transform lines and compact to remove nil values.

4

Print the list of gem names

Write a puts statement to print the gem_names list so the output shows:
["rails", "puma", "nokogiri"]

Ruby

# Print the gem_names list
# Your code here

Need a hint?

Use puts gem_names.inspect to print the array as shown.