private static int countNumChars(String s) {
int num = s.length();
for (int i = 0; i < s.length(); i++) {
if (s.charAt(i) == ' ') {
num--;
}
}
return num;
}
Is one of the fastest I've seen. It runs around 4366.293
On Dec 22, 1:43 pm, David Nolen <[email protected]> wrote:
> On Wed, Dec 22, 2010 at 12:52 PM, Rayne <[email protected]> wrote:
> > Running it gives me around 137343.295 nanoseconds. I've seen some Java
> > algorithms that could run at just under 3000 nanoseconds.
>
> What do the Java implementations look like?
>
> (defn count-num-chars [^String s]
> (let [l (.length s)
> c (int \space)]
> (loop [i 0 acc 0]
> (if (< i l)
> (recur (unchecked-inc-long i)
> (if (= (int (.charAt s i)) c) acc
> (unchecked-inc-long acc)))
> acc))))
>
> On 1.3.0 alpha3 on a 2.66ghz Core i7, 64bit OS X JDK 1.6 I see anywhere
> from-
>
> 6900ns-11000ns
>
> Using identical?, codePointAt all make things slower for me.
>
> David
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