From: John Feminella <johnf@...>
Date: 2011-03-16T00:31:56+09:00
Subject: Re: Array#rotate fails in a simple program

> 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
<RichardDummyMailbox58407@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 in http://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
>
>