Classes

class Course
  attr_reader :title, :price

  def initialize(title, price)
    @title = title
    @price = price
  end

  def describe
    "#{@title} -- $#{@price}"
  end
end

course = Course.new("Ruby Mastery", 149.99)
puts course.describe

attr_reader generates getter methods automatically -- without it, you'd write def title; @title; end by hand for every field.