Two mistakes:
First, if you want sum to take a vector, you should remove the & from
the arglist.
Second, (rest(other)) should be (rest other).
This buys you:
user> (defn sum [more ]
((fn [total other]
(if other
(recur (+ total (first other)) (rest other))
total))
0 more))
#'user/sum
user> (sum [1 2 3 4])
10
(of course, sum could also be defined as just (apply + more) or
(reduce + more)).
-Jason
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