BTW Rich,

The documentation http://clojure.org/data_structures hints that
accessors are faster than regular map lookups and provides the
following example:
(reduce (fn [n y] (+ n (:fred y))) 0 x)
 -> 4999950000
(reduce (fn [n y] (+ n (fred y))) 0 x)
 -> 4999950000

However I think it would be clearer if you explicitly showed the speed
improvement:
user=> (time (reduce (fn [n y] (+ n (:fred y))) 0 x))
"Elapsed time: 100.838989 msecs"
4999950000
user=> (time (reduce (fn [n y] (+ n (fred y))) 0 x))
"Elapsed time: 48.82307 msecs"
4999950000


Regards,
Tim.


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