my extension of Object class

object.rb

require 'active_support'
require 'active_support/core_ext'
class Object
  # # my Object#survive = ActiveSupport's Object#presence + block
  def survive
    if present?
      if block_given?
        self if yield(self)
      else
        self
      end
    end
  end
end

# example
1.survive(&:even?) # => nil
2.survive(&:even?) # => 2