Array.backward(Function,StartValue)
Returns the backward value of the given array.The first array element becomes the last, and the last array element becomes the first.But backward() will not change the original array value.
(1..10).backward()
10 9 8 7 6 5 4 3 2 1
|3,2,1..10|.backward()
6 5 4 3 2 1