reversing the order of an array in ruby

Question

I have the following array [12,16,5,9,11,5,4] it prints: 12,16,5,9,11,5,4.

I want it to print: 4,5,11,9,5,16,12

When I

Answer 1

Are you trying to reverse the list in place? If so then do:

>> arr = [12,16,5,9,11,5,4]
=> [12, 16, 5, 9, 11, 5, 4]
>> arr.reverse!
=> [4, 5, 11, 9, 5, 16, 12]
>> arr
=> [4, 5, 11, 9, 5, 16, 12]

Otherwise:

>> arr_rev=arr.reverse
=> [4, 5, 11, 9, 5, 16, 12]
>> arr_rev
=> [4, 5, 11, 9, 5, 16, 12]