class Object

Yields self to the block, and then returns the return value of the block.
The primary purpose of this method is to transform a value in a method 
chain without breaking the chain.

1, 2, 3

.map {|x| x * x } .as {|array| array.reverse } .each {|x| puts x }

# File lib/object_as_no_refinements.rb, line 15
def as
  yield self
end