$ irb
irb(main):001:0> arr = [7,4,6,8,5,10,9,2,3,11,1]
=> [7, 4, 6, 8, 5, 10, 9, 2, 3, 11, 1]
irb(main):002:0> arr.sort
=> [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11]
irb(main):003:0>