# A reflective programming language --
# one in which the active environment can query the objects
# that define itself and extend or modify them at runtime.
puts "abc".class # Prints String
puts 345.class # Prints integer constant
class Animal
end
class Dog < Animal
end
rover = Dog.new
puts rover.class # Prints Dog
if rover.is_a? Dog
puts "Of course he is."
end
if rover.kind_of? Dog
puts "Yes, still a dog."
end
if rover.is_a? Animal
puts "Yes, he's an animal, too."
end
