From: RichardOnRails <RichardDummyMailbox58407@...>
Date: 2011-03-16T07:10:34+09:00
Subject: Re: Array#rotate fails in a simple program

On Mar 15, 11:31 am, John Feminella <jo...@bitsbuilder.com> wrote:
> > Is Array#rotate! only defined in a Ruby version later than mine?  Or
> > is there something I'm missing here?
>
> Yes. The ruby-doc.org link is for Ruby 1.9.2. (Also, 1.8.6 is a rather
> old version of Ruby, so you might want to consider upgrading anyway
> even if you're not impacted by the loss of #rotate!).
>
> ~ jf
> --
> John Feminella
> Principal Consultant, BitsBuilder
> LI:http://www.linkedin.com/in/johnxf
> SO:http://stackoverflow.com/users/75170/
>
> On Tue, Mar 15, 2011 at 11:23, RichardOnRails
>
> <RichardDummyMailbox58...@uscomputergurus.com> wrote:
> > I'm runing Ruby 1.8.6 over WinXP-Pro/SP3
>
> > I'm writing a program to illustrate prime numbers and Ruby programming
> > for my teenage granddaughter.  Unfortunately, I've got a problem:
>
> > On line 54, I've got the statement:
> > $primes.rotate!(group_size)
>
> > That results in the error:
> > Adrienne01.rb:54: undefined method `rotate!' for [2, 3, 5, 7]:Array
> > (NoMethodError)
>
> > However,http://www.ruby-doc.org/core/defines "ary.rotate!(cnt=1) -->
> > ary"
> > Also, "rotate" (without the bang) is defined in Ruby/core and fails in
> > the same manner.
>
> > I've posted the program and its output inhttp://www.pastie.org/1674687
>
> > Is Array#rotate! only defined in a Ruby version later than mine?  Or
> > is there something I'm missing here?
>
> > Any guidance offered will be gratefully received.
>
> > Best wishes,
> > Richard
>
>

Thanks John: Point taken! I'm installing 1.9.2, plus Pik for switching
(in a Windows environment) between Ruby versions and Rails versions.

Best wishes,
Richard