making array that filled the numbers, these are random and uniq.

uniq_rand_ary.rb

def uniq_rand_ary(size)
	ary1 = []
	ary2 = []
	
	size.times do |i|
		ary1 << i
	end

	count = ary1.size
	count.times do |c|
		ary2 << ary1.delete_at(rand(count - c))
	end
	return ary2

end

uniq_rand_ary(size) can use making a array that are filled the numbers

size of array is first argument.

first argument must be Numeric