Option type-like (?) extension for Object

gistfile1.rb

class Object
  def or(els)
    if block_given?
      yield (self or els)
    else
      els
    end
  end
end

puts nil.or(0) { |x| x+1 }
puts 1.or(0) { |x| x+1 }
puts nil.or(0) + 1