How do I generate a list of n unique random numbers in Ruby?

Question

This is what I have so far:

myArray.map!{ rand(max) }

Obviously, however, sometimes the numbers in the list are not unique. How can I mak

Answer 1

As far as it is nice to know in advance the maxium value, you can do this way:

class NoLoopRand
  def initialize(max)
    @deck = (0..max).to_a
  end

  def getrnd
    return @deck.delete_at(rand(@deck.length - 1))
  end
end

and you can obtain random data in this way:

aRndNum = NoLoopRand.new(10)
puts aRndNum.getrnd

you'll obtain nil when all the values will be exausted from the deck.