By Alvin Alexander. Last updated: June 4, 2016 The first in hopefully a series of ooa/ood koans: no end user. page-1 ooa ood Fri, May 3, 2002 Sat, May 4, 2002 Wed, May 29, 2002 Wed, June 5, 2002 Thu, May 22, 2003 books by alvin Scala Either type: How to get the value out of an Either In dreams, light switches don’t work ZIO 2: Processing ZIO command line arguments ZIO 2: A ZIO.timeout interrupt example with ZIO.attempt ZIO 2: Using Either with ZIO in a Scala for-expression