On Sunday, February 3, 2013 9:56:49 PM UTC-5, puzzler wrote:
>
> In these examples, the map/record is freshly created each time through the
> loop, so caching should not be a factor.
>
Good point. So maybe it's not the caching :).
Another factor is that literal hashmaps are actually PersistentArrayMaps.
If you use PersistentHashMaps instead of PersistentArrayMaps you get
similar performance:
Clojure 1.5.0-RC4
user=> (class {:x "a" :y 3})
clojure.lang.PersistentArrayMap
user=> (time (dotimes [n 10000000] (hash (hash-map :x "a" :y 3))))
"Elapsed time: 3315.031872 msecs"
nil
Paul
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