bouncer.rb

        def bouncer(name, age = 18)
          if age < 21
            puts "Go away, #{name}"
          else
            puts "OK"
          end
        end


        def hello(name, more = { })

          attributes = {
            :age => 21,
            :city => 'San Diego, CA'
          }

          attributes.merge!(more)

          puts "Name: #{name}"

          attributes.each_pair do |k, v|
            puts "#{k} :: #{v}"
          end
        end


        hello "Nathaniel", :age => 28, :hair => 'brown'