personal chef from Ruby in 100 Minutes (http://tutorials.jumpstartlab.com/projects/ruby_in_100_minutes.html)

personal_chef.rb

class PersonalChef
  def make_toast
    puts "Making your toast!"
  end

  def make_milkshake
    puts "Making your milkshake!"
  end

  def make_toast(color)
    if color.nil?
      puts "How am I supposed to make nothingness toast?"
    else
      puts "Making your toast #{color}"
    end
  end

  def make_milkshake(flavor)
    puts "Making your milkshake #{flavor}"
    return self
  end

  def make_eggs(quantity)
    quantity.times do
      puts "Making an egg."
    end
    puts "I'm done"
    return self
  end

  def gameplan(meals)
    meals.each do |meal|
      puts "We'll have #{meal}"
    end

    all_meals = meals.join(", ")
    puts "In summary: #{all_meals}"
  end

  def inventory
    produce = {apples: 3, oranges: 1, carrots: 12}
    produce.each do |item, quantity|
      puts "There are #{quantity} #{item} in the fridge"
    end
  end

  def water_status(minutes)
    if minutes < 7
      puts "The water is not boiling yet"
    elsif minutes == 7
      puts "It's just barely boiling"
    elsif minutes == 8
      puts "It's boiling"
    else
      puts "Hot!"
    end
    return self
  end

  def countdown(counter)
    while counter > 0
      puts "The counter is #{counter}"
      counter = counter - 1
    end
    return self
  end
end

class Butler
  def open_front_door
    puts "Opening your front door"
  end

  def open_door(name)
    puts "Opening your #{name} door"
  end
end