From: transfire@...
Date: 2006-06-19T19:19:47+09:00
Subject: Re: Is it more convenient to have a random_each in ruby stdlib?


Alex Young wrote:
> Kroeger, Simon (ext) wrote:
> >
> >
> >> From: uncutstone wu
> >> Sent: Monday, June 19, 2006 9:54 AM
> <snip>
> >> class  Array
> >> 	def random_each
> >> 		a = self.dup
> <snip>
>
> > I think it's a little bit to simple to be put in the standard lib.
> >
> > a.sort_by{rand}.each {|e| print e , ' '}
>
> For large collections, it'd be much nicer not to have to either
> duplicate or sort - isn't this something that quasirandom sequences are
> good for?  Is there some GSL-guru out there who can comment?

Perhaps...

  class  Array
     def random_each
          ((0...size).to_a.sort_by{rand}).each { |i|
            yield self[i]
          }
     end
  end 

T.