chiwawa.rb

class Person
   attr_reader :name
    def initialize(name)
   	 self.name = name
  	end
  
  def name=(name)  
    if name == nil or name.size == 0  
      raise ArgumentError.new('Must have a  name.')  
    end 
    @name = name 
  end  	
end

p Person.new("Pedro")
# p Person.new(nil)
# p Person.new("")

# person = Person.new("Juan")
# p person.name = "Pedro"
# p person = nil
# p person1 = ""