如何获得包含相同元素的两个数组的交集？

Question

apple = ["a","p","p"]
zebra = ["a","p","p","l","e"]
apple & zebra
# returns => ["a", "p"]

我想要一个能够返回[＆＃34; a＆＃34;，＆＃34; p＆＃34;，＆＃34; p＆＃34;]

的函数

有没有办法可以做到这一点？