How to iterate through an array starting from the last element? (Ruby)

Question

I came with below solution but I believe that must be nicer one out there ...

array = [ \'first\',\'middle\',\'last\']

index = array.length
array.length.t         


        

Answer 1

If you want to achieve the same without using reverse [Sometimes this question comes in interviews]. We need to use basic logic.

1. array can be accessed through index
2. set the index to length of array and then decrements by 1 until index reaches 0

3. output to screen or a new array or use the loop to perform any logic.

       def reverseArray(input)
         output = []
         index = input.length - 1 #since 0 based index and iterating from 
         last to first
   
         loop do
           output << input[index]
           index -= 1
           break if index < 0
         end
   
         output
       end
   
       array = ["first","middle","last"]
   
       reverseArray array #outputs: ["last","middle","first"]