On Jul 15, 2:22 pm, John Harrop <jharrop...@gmail.com> wrote:
> On Wed, Jul 15, 2009 at 11:39 AM, B Smith-Mannschott
> <bsmith.o...@gmail.com>wrote:
>
> > An explicit loop with some type hints is faster, though likely not as
> > fast as Java:
>
> > (defn sum-of-range-4 [range-limit]
> > (loop [i (int 1) s (long 0)]
> > (if (< i range-limit)
> > (recur (inc i) (+ s i))
> > s)))
>
> > This took 20.275s for the same scenario.
>
> Use unchecked-add and unchecked-inc in place of + and inc and you should get
> equivalent speed.
Frantisek's solution is the right way, and will run within 5-10% of
the Java version, Going to unchecked-* is generally not worth it and I
don't recommend it. You should only use it when you desire the
wrapping behavior.
Rich
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