I do the following (with range-length 1e8):
(time (let [[t d] (split-with #(< % 12) (range range-length))]
[(count d) (count t)]))
(time (let [[t d] (split-with #(< % 12) (range range-length))]
(into [] (reverse [(count t) (count d)]))))
This gives:
"Elapsed time: 68105.338314 msecs"
[99999988 12]
"Elapsed time: 11545.667394 msecs"
[99999988 12]
So the first expression
takes as six times as long to evaluate.
I understood that this has to do with that in the first case there is head
retention. But I do not understand this. What is happening here?
--
Cecil Westerhof
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