Is it possible to change the class of a Ruby object?

Question

Is it possible to change the class of a Ruby object once it has been instantiated, something like:

class A
end

class B
end

a = A.new
a.class = B
         


        

Answer 1

When I needed to convert from the built-in String class to a custom class called MyString, I did it via the following:

class MyString < String
  #Class body here
end

class String
  def to_MyS
    MyString.new self
  end
end

foo = "bar"
puts foo.class #=> String

foo = foo.to_MyS
puts foo.class #=> MyString