From: Brian Candler <b.candler@...>
Date: 2010-03-02T05:47:58+09:00
Subject: Re: Random integer within a range?

Reiichi Tyrael wrote:
> It's work! Thank you David!
> But there is no way to do it like in my version "rand(n1..n2)"? It's 
> more friendly that way XD

Sure:

def myrand(r=nil)
  if r.is_a?(Range)
    rand(r.last - r.first + (r.exclude_end? ? 0 : 1)) + r.first
  else
    rand(r)
  end
end

Or if you prefer:

module Kernel
  alias :orig_rand :rand
  def rand(r=nil)
    if r.is_a?(Range)
      orig_rand(r.last - r.first + (r.exclude_end? ? 0 : 1)) + r.first
    else
      orig_rand(r)
    end
  end
end

I suspect it's not implemented in Ruby because it's not obvious what 
rand(0.3..5.7) should do.
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