# Copied and adapted from
# http://recursive.ca/hutch/2007/11/22/a-little-unnecessary-smalltalk-envy/
# Bob Huntchison
class Object
  # yield self when it is non nil.
  def if_not_nil(&block)
    yield(self) if block
  end

  # yield to the block if self is nil
  def if_nil(&block)
    self
  end
end

class NilClass
  # yield self when it is non nil.
  def if_not_nil(&block)
    nil
  end

  # yield to the block if self is nil
  def if_nil(&block)
    yield if block
  end
end