This is a terrible example of IF-less programming. The conditional is still here, it is just implied.

IF:

        def method (object)
	  if object.property
	    param = object.property
	  else
	    param = default_param
	  end
	end

Claimed to be IF-less:

        def method (object)
	  param = object.property || default_param
	end

It may be easier to read, but in the end you are still writing an IF statement.