Reverse an array without using a loop in ruby

Question

I have a coding challenge to reverse a an array with 5 elements in it. How would I do this without using the reverse method?

Code:

def reverse(array)
 a         


        

Answer 1

Here's another non-destructive approach:

arr = ["a", 1, "apple", 8, 90]

arr.size.times.with_object([]) { |_,a| a << arr.rotate!(-1).first }
  #=> [90, 8, "apple", 1, "a"]
arr
  #=> ["a", 1, "apple", 8, 90] 

Another would the most uninteresting method imaginable:

(arr.size-1).downto(0).with_object([]) { |i,a| a << arr[i] }
  #=> [90, 8, "apple", 1, "a"]
arr
  #=> ["a", 1, "apple", 8, 90]