I see...
thanks a lot! :-)
Jim
On 25/02/13 12:34, David Powell wrote:
Some time before the release of Clojure 1.0, there didn't used to be
any such thing as an empty sequence. You either had a (lazy)
sequence, or nil. This made it easy to use sequences as emptiness
tests, but had the cost that a lazy sequence wasn't fully lazy because
anything that returned one had to attempt to evaluate the first item
in order to determine whether there was anything to return or not.
[ There are some obsolete notes describing the change here:
http://clojure.org/lazy for the historically curious. Or perhaps
here: http://clojure.org/lazier (And the 'streams' referred to in
those docs refer to this failed experiment:
http://clojure.org/streams). Basically lazy-cons was replaced by
lazy-seq. ]
--
Dave
--
--
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 unsubscribe from this group and stop receiving emails from it, send
an email to clojure+unsubscr...@googlegroups.com.
For more options, visit https://groups.google.com/groups/opt_out.
--
--
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 unsubscribe from this group and stop receiving emails from it, send an email
to clojure+unsubscr...@googlegroups.com.
For more options, visit https://groups.google.com/groups/opt_out.
