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 simulate Nothing with exceptions.

class NothingError < RuntimeError  
end  

def nothing
  raise NothingError
end

def foo x
  if x>0 then x else nothing end
end

def nothingness
  begin
    yield
  rescue NothingError
  end
end

a = [1,2,3]
nothingness { a << foo(4) }
nothingness { a << foo(0) }

Probably not a great idea however ...