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

[*1..99].sample(4) #=> [64, 99, 29, 49]

According to Array#sample docs,

The elements are chosen by using random and unique indices

If you need SecureRandom (which uses computer noise instead of pseudorandom numbers):

require 'securerandom'

[*1..99].sample(4, random: SecureRandom) #=> [2, 75, 95, 37]