reverse array

custom_reverse.rb

def reverse_array(arr)
  return arr if arr.empty?
  arr = arr.dup

  start_index = 0
  end_index = arr.length - 1

  while start_index < end_index
    arr[start_index], arr[end_index] = arr[end_index], arr[start_index]

    start_index += 1
    end_index -= 1
  end

  arr
end

origin_array = [1, 2, 3, 4]
reverse_array(origin_array) # => [4, 3, 2, 1]
reverse_array([]) # => []
origin_array # => [1, 2, 3, 4]