From: Max Williams <toastkid.williams@...>
Date: 2008-07-04T01:59:14+09:00
Subject: Re: pseudo-randomize an array in a consistent order

ThoML wrote:
> On Jul 3, 4:56 pm, Max Williams <toastkid.willi...@gmail.com> wrote:
>> Does anyone know how to pseudo-randomize an array (eg with a seed) so
>> that you get the same order every time you do it?
> 
> ruby19 has a Array#shuffle method:
> irb(main):001:0> Kernel.srand(1); [1,2,3,4,5].shuffle
> => [2, 4, 1, 5, 3]
> irb(main):002:0> Kernel.srand(1); [1,2,3,4,5].shuffle
> => [2, 4, 1, 5, 3]

I'm only on 1.8.6 (and not likely to change soon since we'd want to do 
all our work servers as well), but out of interest, do you know how 
shuffle compares to .sort_by{rand} (thanks rob!) in terms of efficiency?


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