Swift 取出两个数组的相同元素

用Swift取出两个数组的相同元素，用数组的forEach方法就可以，示例如下：

let arrayOne = ["a","ab","abc","ac"]
let arrayTwo = ["ab","abc","c"]

arrayOne.forEach { (i) in
    arrayTwo.forEach({ (j) in
        if i == j{
           //做你需要做的事
            print("\(i)")
        }
    })
}

结果如下：

ab
abc