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?
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