Ruby实现冒泡排序

def bubble_sort(array)
    return array if array.size < 2

    (array.size-2).downto(0) do |i|
        (0..i).each do |j|
            array[j],array[j+1] = array[j+1],array[j] if array[j] >= array[j+1]
        end
    end

    return array
end

a = [12,42,1,25,32,63,18]
p bubble_sort(a)