On Jun 14, 3:21 am, Wrexsoul <d2387...@bsnow.net> wrote:
> It lets you write the generator in a style similar to loop/recur, and
> generally in half the code. And, it demonstrates the kinds of things
> you can do with macros.
Ahh, I see. That could be useful under some circumstances. However,
most Clojure functions that deal with lists return lazy seqs, so a lot
of the time you don't need to call lazy-seq directly.
For instance, lets say I want to return a lazy list of all the lines
in all the files in a directory tree:
(use '(clojure.contrib java-utils
duck-streams))
(defn all-line-seq [dir]
(mapcat read-lines (file-seq (file dir))))
Since file-seq, read-lines and mapcat all lazy, my final result is
lazy as well.
> Is file-seq recursive? I'd figured it just returned the flat contents
> of a directory.
Yep, it's recursive. If you just want the flat list you could just use
the .listFiles method, which I guess is why there isn't an explicit
function for it in clojure.core.
- James
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