Creating a gem basics in Ruby - Quick Revision & Summary

Recall & Review

beginner

What is a Ruby gem?

A Ruby gem is a packaged library or tool that can be shared and reused in Ruby programs. It helps you add features without writing all code yourself.

beginner

Which command creates a new gem skeleton in Ruby?

The command bundle gem gem_name creates a new folder with files and folders needed to start a gem.

intermediate

What is the purpose of the gemspec file in a Ruby gem?

The gemspec file describes the gem’s name, version, author, summary, files, and dependencies. It tells RubyGems how to build and install the gem.

beginner

How do you build a Ruby gem into a .gem file?

Run gem build gem_name.gemspec. This creates a .gem file you can install or share.

beginner

How can you install your built gem locally?

Use gem install ./gem_name-version.gem to install the gem file on your computer.

What does the command bundle gem my_gem do?

A Creates a new gem project skeleton named my_gem

B Installs the gem named my_gem

C Updates all gems including my_gem

D Removes the gem named my_gem

The command bundle gem my_gem sets up a new folder with files to start building a gem called my_gem.

Which file contains the gem’s metadata like version and author?

A Gemfile

B README.md

C gem_name.gemspec

D lib/gem_name.rb

The gemspec file holds important info about the gem such as its version, author, and dependencies.

How do you build the gem package from the gemspec file?

A gem install gem_name.gemspec

B bundle install

C ruby gem_name.gemspec

D gem build gem_name.gemspec

The gem build command creates the .gem package from the gemspec.

What is the main folder where your gem’s Ruby code lives?

A bin/

B lib/

C spec/

D doc/

The lib/ folder contains the main Ruby files for your gem.

Which command installs a gem from a local .gem file?

A gem install ./gem_name-version.gem

B gem install gem_name

C bundle install gem_name

D ruby install gem_name.gem

Use gem install ./gem_name-version.gem to install a gem from a local file.

Explain the basic steps to create and share a Ruby gem.

Think about starting, describing, coding, packaging, and sharing.

What is the role of the gemspec file and why is it important?

It’s like the gem’s ID card and instruction sheet.