问题：
What's the most efficient way to test if an array contains any element from a second array?测试数组是否包含来自第二个数组的任何元素的最有效方法是什么？
Two examples below, attempting to answer the question does foods contain any element from cheeses :下面的两个例子试图回答这个问题， foods含有cheeses任何元素：
cheeses = %w(chedder stilton brie mozzarella feta haloumi reblochon)
foods = %w(pizza feta foods bread biscuits yoghurt bacon)
puts cheeses.collect{|c| foods.include?(c)}.include?(true)
puts (cheeses - foods).size < cheeses.size
解决方案：
参考一： https://en.stackoom.com/question/GXTl参考二： https://stackoom.com/question/GXTl