scrap.rb

#ruby 2.0.0p648 (2015-12-16 revision 53162) [universal.x86_64-darwin15]

class FoodGroup

  def initialize(food)
    @food = food
  end

  MAPPINGS = {
      "grain" => ['Rice', 'Trigo', 'Avena', 'Barley', 'Flour'],
      "vegetable" => ['Carrot', 'corn' 'Corn', 'Pumpkin', 'Papa'],
      "fruit" => ['Apple', 'Mango', 'Strawberry', 'Peaches', 'Pineapple'],
      "meat" => ['Res', 'Chicken', 'Salmon', 'Fish', 'Pig'],
      "dairy" => ['Milk', 'Yogurt', 'Cheese', 'Cream']
  }

  def food_group
    food.each do |lookup|
      MAPPINGS.fetch(lookup, "food not found")
    end
  end

end

food_group = FoodGroup.new('a')

# Driver code
p food_group('Cream') == "dairy"
p food_group('Beef') == "meat"
p food_group('Pineapple') == "fruit"
p food_group('Cane') == "food not found"