Can Ruby return nothing?

Question

Can I return nothing in ruby?

Just for educational purpose

For example:

myarray = [1,2,3]
myarray << some_method

def some_method
         


        

Answer 1

You can't return a real Nothing with Ruby. Everything is a object. But you can create a fake Nothing to do it. See:

Nothing = Module.new # Same as module Nothing; end
class Array
  alias old_op_append <<
  def <<(other)
    if other == Nothing
      self
    else
      old_op_append(other)
    end
  end
end

This is ugly but works in your sample. (Nothing keeps being a object.)