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

This uses Set:

require 'set'

def rand_n(n, max)
    randoms = Set.new
    loop do
        randoms << rand(max)
        return randoms.to_a if randoms.size >= n
    end
end