From: Christopher Swasey <christopher.swasey@...>
Date: 2008-02-21T08:11:00+09:00
Subject: Re: IP Address to Decimal - inject sucks

On 2/20/08, Ben Bleything <ben@bleything.net> wrote:
> On Thu, Feb 21, 2008, Ryan Davis wrote:
>  > Ara's pack/unpack is always what I intuitively reach for in a problem
>  > like this, but it turns out to be more expensive than a simple map/
>  > left-shift form. IPAddr is very powerful, but there is a cost to that
>  > power (parsing every IP form under the sun). If I needed anything more
>  > than JUST converting to/from ints I'd use IPAddr.
>  >
>  > # of iterations = 100000
>  >                             user     system      total        real
>  > null_time               0.020000   0.000000   0.020000 (  0.017184)
>  > split/map/<<+           1.040000   0.000000   1.040000 (  1.042783)
>  > split/map/pack/unpack   1.180000   0.000000   1.180000 (  1.177197)
>  > split/inject/<<+        1.310000   0.000000   1.310000 (  1.308850)
>  > split/inject/+*         1.430000   0.010000   1.440000 (  1.436653)
>  > split/inject/+*=        1.640000   0.000000   1.640000 (  1.637948)
>  > split/zip/inject/+*     2.290000   0.000000   2.290000 (  2.288469)
>  > ohdeargodno             2.670000   0.000000   2.670000 (  2.678789)
>  > ipaddr/to_i             3.940000   0.010000   3.950000 (  3.950504)
>
>
> Awesome!  Glad to see I was able to provide the slowest solution ;)
>
>
>  Ben

In my defence (ohdeargodno was my response), I focused on squeezing
the existing logic/train of thought into a single line, rather than
rewriting for efficiency. (Not that I'd have necessarily fared better
had that been a concern.)

Christopher