From: lasitha <lasitha.ranatunga@...>
Date: 2008-03-27T14:19:15+09:00
Subject: Re: generating unique random numbers



Tim Hunter wrote:
> Jimmy Palmer wrote:
> > I'm trying to generate 8 unique random numbers ...
> > the results need to be between 1 and 13 
> > and they must be unique.
> 
> ~$ irb
> irb(main):001:0> (1..13).to_a.sort_by{rand}[0..7]
> => [7, 3, 8, 2, 11, 4, 1, 9]

For anyone still counting :), the following builds on Tim's approach:

  (1..13).to_a.shuffle.first(8)

Array#shuffle is only available in ruby 1.9+ though.

Cheers, lasitha

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