On 23.01.2009, at 09:35, Mark Engelberg wrote: > Now, here's the puzzle. Let's say you want to convert this idea over > to working with lists, or perhaps sequences in general. > > Should (powerset '(1 2 3)) print as: > (() (1) (2) (3) (1 2) (1 3) (2 3) (1 2 3)) > or > (nil (1) (2) (3) (1 2) (1 3) (2 3) (1 2 3))
My vote is for (), because it specifically represents the empty subset of a list, rather than a generic "nothing in here" value, which is my interpretation of nil. > between lists and sequences and the role of nil and the empty list, so > I look forward to hearing the responses. Let the debating begin! This reminds me of the long debates in the APL community about the shapes of empty nested arrays :-) Konrad. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~----------~----~----~----~------~----~------~--~---
