Refactoring Case Statements and Recycling

recycling.rb

class Recycle
  def initialize
		@plastic_bin = []
		@glass_bin = []
		@paper_bin = []
		@metal_bin = []
		@landfill_bin = []
		@plastic_types = ["num_1", "num_2", "num_3", "num_4", "num_5", "num_6", "num_7"]
		@glass_types = ["clear", "color"]
		@paper_types = ["paper", "cardboard"]
		@metal_types = ["aluminum", "tin", "copper"]
	end

	def recycle_bin(trash)
		case 
		when self.plastic_types.include?(trash)
			self.plastic_bin << trash
		when self.glass_types.include?(trash)
			self.glass_bin << trash
		when self.paper_types.include?(trash)
			self.paper_bin << trash
		when self.metal_types.include?(trash)
			self.metal_bin << trash
		else
			self.landfill_bin << trash
		end
	end
end