On Dec 11, 9:21 am, bOR_ <[EMAIL PROTECTED]> wrote:
> I thought I remembered there was a method in the api somewhere that
> would count the frequency of each unique item in a collection, but I
> can't find it anymore. What would be a brief way to write that in
> clojure?
I think what you want is:
(defn frequencies [coll]
(reduce
(fn [counts x]
(assoc counts x
(if-let [c (counts x)] (inc c) 1)))
{} coll))
user=> (frequencies [:a :a :b :a :b])
{:b 2, :a 3}
-Stuart Sierra
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