Groups > comp.lang.ruby > #1980

string/array slices

Path	csiph.com!x330-a1.tempe.blueboxinc.net!usenet.pasdenom.info!news.dougwise.org!nntpfeed.proxad.net!proxad.net!feeder1-2.proxad.net!usenet-fr.net!de-l.enfer-du-nord.net!feeder2.enfer-du-nord.net!talisker.lacave.net!lacave.net!not-for-mail
From	Patrick Tyler <patrick.a.tyler@gmail.com>
Newsgroups	comp.lang.ruby
Subject	string/array slices
Date	Wed, 30 Mar 2011 12:34:39 -0500
Organization	Service de news de lacave.net
Lines	34
Message-ID	<303f109bd62c19b354717039ac8af1a8@ruby-forum.com> (permalink)
NNTP-Posting-Host	bristol.highgroove.com
Content-Type	text/plain; charset=UTF-8
Content-Transfer-Encoding	7bit
X-Trace	talisker.lacave.net 1301506494 7153 65.111.164.187 (30 Mar 2011 17:34:54 GMT)
X-Complaints-To	abuse@lacave.net
NNTP-Posting-Date	Wed, 30 Mar 2011 17:34:54 +0000 (UTC)
X-Received-From	This message has been automatically forwarded from the ruby-talk mailing list by a gateway at comp.lang.ruby. If it is SPAM, it did not originate at comp.lang.ruby. Please report the original sender, and not us. Thanks! For more details about this gateway, please visit: http://blog.grayproductions.net/categories/the_gateway
X-Mail-Count	380623
X-Ml-Name	ruby-talk
X-Rubymirror	Yes
X-Ruby-Talk	<303f109bd62c19b354717039ac8af1a8@ruby-forum.com>
Xref	x330-a1.tempe.blueboxinc.net comp.lang.ruby:1980

Show key headers only | View raw

Hello,

I know that this has been covered a bit here:
http://www.ruby-forum.com/topic/186437 but I'm still not certain that I
understand.

s = "foo"

s[3] is nil, like I would expect.

s[3,0] is "", instead of nil.
s[4,0] is finally nil.

I don't understand how I'm indexing '3' in the context of [3,0] and
getting anything but nil.
Since s[3] is already nil in the first place.

Same for arrays:

a = [:one, :two]

a[2] is nil
a[2,0] is an empty array ??
a[3,0] is finally nil though.

I understand that in the docs these are special cases and they're not
preventing me from working or anything like that.  I am just curious to
understand the why/how about them working this way.

Thank you!

-- 
Posted via http://www.ruby-forum.com/.

Back to comp.lang.ruby | Previous | Next — Next in thread | Find similar | Unroll thread

Thread

string/array slices Patrick Tyler <patrick.a.tyler@gmail.com> - 2011-03-30 12:34 -0500
  Re: string/array slices 7stud -- <bbxx789_05ss@yahoo.com> - 2011-03-30 13:08 -0500
    Re: string/array slices Gary Wright <gwtmp01@mac.com> - 2011-03-30 16:22 -0500
      Re: string/array slices 7stud -- <bbxx789_05ss@yahoo.com> - 2011-03-30 20:03 -0500
        Re: string/array slices Adam Prescott <adam@aprescott.com> - 2011-03-31 02:17 -0500
  Re: string/array slices 7stud -- <bbxx789_05ss@yahoo.com> - 2011-03-30 13:24 -0500
    Re: string/array slices Gary Wright <gwtmp01@mac.com> - 2011-03-30 15:31 -0500
      Re: string/array slices 7stud -- <bbxx789_05ss@yahoo.com> - 2011-03-30 19:55 -0500
  Re: string/array slices Patrick Tyler <patrick.a.tyler@gmail.com> - 2011-03-30 14:42 -0500
  Re: string/array slices Patrick Tyler <patrick.a.tyler@gmail.com> - 2011-03-30 16:16 -0500
    Re: string/array slices Ross Harvey <chaos@ross.aero> - 2011-03-30 16:37 -0500
      Re: string/array slices Patrick Tyler <patrick.a.tyler@gmail.com> - 2011-03-30 19:45 -0500
  Re: string/array slices Patrick Tyler <patrick.a.tyler@gmail.com> - 2011-03-30 16:46 -0500

csiph-web