Sorting Example 4

sort4.rb

class Animal
  attr_reader :name, :eyes, :appendages
  
  def initialize(name, eyes, appendages)
    @name, @eyes, @appendages = name, eyes, appendages
  end

  def inspect
    @name
  end
end

animals = [Animal.new("octopus", 2, 8),
Animal.new("spider", 6, 8),
Animal.new("bee", 5, 6),
Animal.new("elephant", 2, 4),
Animal.new("crab", 2, 10)]

animals.sort_by { |x| x.eyes }

# => [octopus, elephant, crab, bee, spider]

animals.sort_by { |x| x.appendages }

# => [elephant, bee, octopus, spider, crab]