I'm attempting to write a simple histogram function:

<code>
(defn create-histogram [f]
  (let
    [words (read-lines f)
     histo {}]
    (doall
      (map
        (fn [w] (assoc histo w (+1 (get histo w 0))))
        words))
    histo))

(create-histogram "./testwords")
</code>

The input, 'f', is expected to be a file of words, as you'd get from '/usr/share/dict/words'.

I don't see how to accumulate the results in the map, 'histo'. This is really a question of how does one map a function to a collection and accumulate the results...

-Todd

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