From: Joe Gwozdecki <joegw@...>
Date: 2003-07-09T08:46:38+09:00
Subject: Re: Code Snippet: Array.shuffle


"Brian Candler" <B.Candler@pobox.com> wrote in message
news:20030708224157.GA75351@uk.tiscali.com...
> On Wed, Jul 09, 2003 at 06:05:28AM +0900, Joe Gwozdecki
wrote:
> > How come when I try out this code snippet in IRB,
including
> > entering the array, it does nothing?  Am I missing
> > something?
>
> I don't know. Here's an irb session log:
>
> $ irb
> irb(main):001:0> class Array
> irb(main):002:1> def shuffle
> irb(main):003:2> each_index { |i| r = rand(length)
> irb(main):004:3>   self[i],self[r] = self[r],self[i] }
> irb(main):005:2> end
> irb(main):006:1> end
> => nil
> irb(main):007:0> a = [1,2,3,4,5,6,7,8,9,10]
> => [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
> irb(main):008:0> a.shuffle
> => [8, 7, 1, 4, 9, 10, 3, 2, 6, 5]
> irb(main):009:0> a.shuffle
> => [7, 10, 5, 9, 8, 1, 6, 3, 4, 2]
> irb(main):010:0>
>
> What did you do differently? Note that if you miss a
bracket or an 'end'
> then irb may think you are in a continuation line; if the
prompt ends with
> an asterisk this is a pretty strong clue.
>
> irb(main):012:0> [
> irb(main):013:1* 1,2,3
> irb(main):014:1> ]
> => [1, 2, 3]
>
> Regards,
>
> Brian.
>

Your coding works fine in IRB.  The original poster wrote a
= Array[1,2,3,4,5,6,7,8,9,10]  which did not work.  Get rid
of "Array" and it works.

Joe Gwozdecki
Houston, Texas