//: Playground - noun: a place where people can playimport Foundation/*可选链:1.可选链访问方式:将强制解析的感叹号换成?, 在隐式解析的后面也添加?2.可选链会自动判断程序访问的关联实例是否为nil, 即使为nil, 也不会报异常*/class Person{    var name:String?    var age: Int?        init(name:String)    {        self.name = name    }        func info()    {        print("我的名字是:\(self.name!)")    }}class Company{    var employees = [        Person(name: "Rinpe"),        Person(name: "Lili"),        Person(name: "Lolo")    ]        func isEmployee(name:String) -> Person?    {        for employee in employees {            if name == employee.name            {                return employee            }        }        return nil    }}var e = Person(name: "Lala")let company = Company()company.isEmployee(e.name!)?.age = 10