bubble sort attempt ruby

bubblesort.rb

def bubble_sort(a) 
  i = 0
  len = a.size - 1

  while len >= i
    j = 0 
  
    while len > j 
      if a[j] > a[j+1]
        tmp = a[j]
        a[j] = a[j + 1]
        a[j + 1] = tmp
      end
      j += 1
    end
  
    p "len #{len}"
    p "i #{i}"
    len -= 1
    i += 1 
  end
  a
end