Okay, first, I create an atom that holds a set:
user> (def visitors (atom #{}))
#'user/visitors
user> (swap! visitors conj "stu")
user> (swap! visitors conj "mary")
user> (swap! visitors conj "mary")
user> (swap! visitors conj "lawrence")
#{"stu" "lawrence" "mary"}
Then I turn this into a string:
user> (apply str @visitors)
"stulawrencemary"
user> (apply str (reverse @visitors))
"marylawrencestu"
So far, everything is working as I thought. But I also thought that apply
let me run a function on everything in a sequence. Other than "str", I
could not get this to work:
user> (apply #(println %1) @visitors)
This got me a "Wrong number of args" error. So did this:
(apply #([] println %) @visitors)
When I use 'map', I got what I expected:
user> (map #(println " we love this user: " %) @visitors)
(stu
lawrence
nil mary
nil nil)
But why does apply work with str, but not with any anonymous function I
write?
--
You received this message because you are subscribed to the Google
Groups "Clojure" group.
To post to this group, send email to [email protected]
Note that posts from new members are moderated - please be patient with your
first post.
To unsubscribe from this group, send email to
[email protected]
For more options, visit this group at
http://groups.google.com/group/clojure?hl=en
