Thanks a lot .. really good On Oct 6, 5:39 pm, B Smith-Mannschott <bsmith.o...@gmail.com> wrote: > On Wed, Oct 6, 2010 at 08:49, Abraham <vincent....@gmail.com> wrote: > > Dear All , > > > I wanted to list the files of a folder , if a folder within , then it > > should list the files of that folder and so on.. ie recursively list > > files of folders > > > I tried with recur & loop and could not do it . Then i searched the > > internet for the code , i got the code , but i am not able to > > understand it , what is -> for ? > > following is the code . > > -> is a macro. It rewrites the code it's invoked on before it is compiled: > > (-> dirpath File. file-seq) > becomes: > (file-seq (File. dirpath)) > > You can think of -> threading its first argument through a list of > functions. So we give dirpath to File. then we give the result of that to > file-seq. > > > > > ; prints all files > > (import 'java.io.File) > > (defn walk [dirpath] > > (doseq [file (-> dirpath File. file-seq)] > > (println (.getPath file) ))) > > This doesn't do what you said you wanted to do above: list all files, > recursively. It just lists the files contained directly in dirpath. > > > > > can anybody help to do with using recur / loop so to know how to use > > recur or loop. > > loop/recur allow one to describe iterative computations in a recursive > style. Iterative computations don't consume stack space. > > Listing files recursively is a tree recursion. A tree recursion is not an > iterative process. loop/recur won't help you there. You'll need to use real > stack-consuming recursion. > > Here's an example that will produce a recursive list of all files in or > below a given directory: > > http://gist.github.com/613279 > > Note, however, that the recursion is indirect, since walk calls mapcat, > which calls walk again. > > // Ben > > Thanks in advance > > > > > Abraham > > > -- > > 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<clojure%2bunsubscr...@googlegroups.com > > > > > For more options, visit this group at > >http://groups.google.com/group/clojure?hl=en
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