On Fri, Nov 27, 2015 at 10:31 AM, Jeffrey Brown <jeffbrown.the@gmail.com> wrote:
Elliot Cameron, very smart guy, once advised me to make illegal state invalid. Jake Brownson, another, recommended trying to use Maybes and Eithers instead of throwing exceptions. I'm having trouble coming up with examples but I think they're both helpful.


I think I know roughly what you are talking about, but there are places where unexpected input might result in something like an empty list. Suppose I need the head of that list under normal conditions. Maybe the list is produced by library code so I can't alter the data structures. That's the kind of situation I want to identify precisely and immediately.

D