"The Good, the Bad and the Absent" (or Success, Failure and Nil): a talk about the pitfalls of using Nil, and how we might represent absence or failure better.
My standard disclaimer applies:
Full credit to these blog posts for inspiration:
* Sandi Metz' "Suspicions of Nil": http://www.sandimetz.com/blog/2014/12/19/suspicions-of-nil
* Avdi Grimm's "Null Objects and Falsiness" : http://devblog.avdi.org/2011/05/30/null-objects-and-falsiness/
Sorry about the yellow "speaker note" post-its; Keynote is terrible at exporting PDFs.