second smallest number in an array

second_smallest.rb

def second_smallest arr

  min_arr = []

  arr.each_slice(2) do |x,y|
    if y.nil? or x < y 
      min_arr << x
    else
      min_arr << y 
    end
  end

  if min_arr.size > 2 
    sec_min,min = second_smallest(min_arr) 

    min_ind = min_arr.index(min)

    if min_ind % 2 == 0 
      if !min_arr[min_ind+1].nil? and sec_min > min_arr[min_ind+1]
        sec_min = min_arr[min_ind+1]
      end
    else
      if sec_min > min_arr[min_ind-1]
        sec_min = min_arr[min_ind-1]
      end 
    end
    return sec_min, min
  else

    if min_arr[0] < min_arr[1]
      return min_arr[1],min_arr[0]
    else 
      return min_arr[0],min_arr[1]
    end

  end

end