Returning nil is consistent across seq functions and play well with when,
if-let, when-let, just to name a few...
On Jul 2, 2012 12:12 AM, "Sean Corfield" <seancorfi...@gmail.com> wrote:
> On Sun, Jul 1, 2012 at 12:47 PM, Warren Lynn <wrn.l...@gmail.com> wrote:
> > Right now
> >
> > (last []) => nil
> > (last [nil]) => nil
> >
> > So there is no way to differentiate these two (except with some
> > emptiness checking). In my opinion (last []) should throw an
> > exception, because that's when last does not apply.
>
> That would be horribly inconsistent with the rest of Clojure, IMO:
>
> user> (first [])
> nil
> user> (first [nil])
> nil
> user> (second [])
> nil
> user> (second [nil])
> nil
> user> (second [nil nil])
> nil
> user> (next [])
> nil
> user> ({:a 1 :b 2} :c)
> nil
> user> (map inc nil)
> ()
> user> (map inc [])
> nil
> user> (seq nil)
> nil
> user> (seq [])
> nil
> ;; etc etc etc
>
> Warren, this and some of your other issues with how Clojure works
> makes me curious about your language background. May I ask what
> languages you're most used to? That may help us frame future
> discussions about differences in opinion about features in Clojure.
> --
> Sean A Corfield -- (904) 302-SEAN
> An Architect's View -- http://corfield.org/
> World Singles, LLC. -- http://worldsingles.com/
>
> "Perfection is the enemy of the good."
> -- Gustave Flaubert, French realist novelist (1821-1880)
>
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