This isn't true in Clojure: http://clojure.org/lisps
However, most functions treat an empty seq as nil because they call `seq'
on their arguments.
On Wed, Aug 29, 2012 at 6:41 PM, Joop Kiefte <iko...@gmail.com> wrote:
> An empty sequence is equal to nil.
>
> 2012/8/29 Ambrose Bonnaire-Sergeant <abonnaireserge...@gmail.com>:
> > My guess is that `merge` has an invariant "if all args are nil, return
> nil",
> > making calls to `seq` "contagious" from args to return value.
> >
> > => (merge (seq {}) (seq {}))
> > nil
> >
> > Just a guess though.
> >
> > Thanks,
> > Ambrose
> >
> > On Thu, Aug 30, 2012 at 12:18 AM, Brian Marick <mar...@exampler.com>
> wrote:
> >>
> >> Why does `(merge)` return nil? I would have expected it to return the
> unit
> >> ({}) by analogy with things like this:
> >>
> >> (+) => 0
> >> (*) => 1
> >>
> >> -----
> >> Brian Marick, Artisanal Labrador
> >> Contract programming in Ruby and Clojure
> >> Occasional consulting on Agile
> >>
> >>
> >> --
> >> 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
> >
> >
> > --
> > 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
>
> --
> 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
>
--
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
