Setting Up Ruby
First, check if Ruby is already installed. Open your terminal and run ruby --version. If you see a version number, you're good. If not, time to install. On Mac, the easiest way is using rbenv through Homebrew: brew install rbenv ruby-build, then rbenv install 3.2.2 and rbenv global 3.2.2. On Windows, grab RubyInstaller from rubyinstaller.org — it handles everything for you. After installing, verify with ruby --version again. Use irb to jump into an interactive Ruby session for quick testing. The gem command lets you install packages from RubyGems.
# Check if Ruby is installed
ruby --version
# => ruby 3.2.2 (2023-03-30 revision e510147985) [x64-mingw-ucrt]
# Start interactive Ruby (irb)
irb
# Now you can type Ruby code and see results immediately
# Install a gem (package)
gem install rails
gem install bundler
# List installed gems
gem list