Hi Sean, The background to this lies in the implementation of lazy sequences - seq returns an implementation of ISeq for the data structure in question - nil when there are no elements in the structure. Have a look at http://clojure.org/sequences and also http://clojure.org/lazy which gives the full reasoning behind this. It clarifies when to use next and when to use rest (lazy sequences).
-Hth, Adrian. On Fri, Jan 15, 2010 at 10:26 AM, Sean Devlin <francoisdev...@gmail.com> wrote: > Hey everyone, > I was working with seq today, and I was wondering why I got a certain > result. > > user=> (seq []) > nil > > Why is nil returned, instead of an empty sequence? > > Sean > > -- > 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 > Note that posts from new members are moderated - please be patient with your > first post. > 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 >
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