Design Patterns in Ruby - Template Method

sample_01.rb

class Cappuccino
  def prepare_recipe
    boil_water
    brew_cappuccino_grinds
    pour_in_cup
    add_sugar
  end
  
  private
  
  def boil_water    
    puts 'boil water'
  end
  
  def brew_cappuccino_grinds
    puts 'brew cappuccino grinds'
  end
  
  def pour_in_cup
    puts 'pour in cup'
  end
  
  def add_sugar
    puts 'add sugar'
  end
end

class Tea
   def prepare_recipe
    boil_water
    steep_the_bag
    pour_in_cup
    add_lemon
  end
  
  private
  
  def boil_water    
    puts 'boil water'
  end

  def steep_the_bag
    puts 'steep the bag'
  end
  
  def pour_in_cup
    puts 'pour in cup'
  end
  
  def add_lemon
    puts 'add lemon'
  end
end

cappuccino = Cappuccino.new
cappuccino.prepare_recipe
# => boil water
# => brew cappuccino grinds
# => pour in cup
# => add sugar

tea = Tea.new
tea.prepare_recipe
# => boil water
# => steep the bag
# => pour in cup
# => add lemon