From: lasitha <lasitha.ranatunga@...>
Date: 2009-03-05T20:32:33+09:00
Subject: Re: Cut a string each 80 character

On Thu, Mar 5, 2009 at 2:00 PM, Gennady Bystritsky
<Gennady.Bystritsky@quest.com> wrote:
>> -----Original Message-----
>> From: Leo [mailto:minilith@gmail.com]
>> Sent: Wednesday, March 04, 2009 9:53 PM
>>
>> > string.scan(%r{.{1,80}}).map { |_chunk|
>> >   _chunk + '<br />'
>> > }
>>
>> Isn't that pretty much the same as:
>>
>> string.gsub(%r{.{1,80}}, "\\0<br />")
>
> [...]
> The latter may be faster, though.

Doesn't appear to be.
http://gist.github.com/74249

I threw in a primitive insert loop for comparison and was a little
surprised to find it considerably slower than both the others.

ruby 1.9.1p0 (2009-01-30 revision 21907) [i386-darwin8.11.1]
      user     system      total        real
with_scan    0.750000   0.040000   0.790000 (  0.851104)
with_gsub    0.840000   0.060000   0.900000 (  0.950050)
with_insert  2.000000   0.050000   2.050000 (  2.210962)

Solidarity,
lasitha.