gistfile1.rb

class String
  @@all = []
  def /(other)
    @@all << "#{self} #{other}"
    @@all.join(' and ')
  end
  
  def self.reset
    @@all = []
  end
end
 
def print_these_strings
  result = yield
  String.reset
  puts result
end
 
print_these_strings do
  "hello" / "bob"
  "goodbye" / "joe"
end
 
#  
# => "hello bob and goodbye joe"