如何在Swift对象数组中找到最大值? [英] How to find the max value in a Swift object array?

问题描述

假设我有一个包含Usr对象的数组.并且Usr对象具有属性age.除了逐一读取Usr对象并逐一比较age值之外，是否有任何捷径可做?谢谢.

Let say I got an array with Usr objects. And the Usr object have the attribute age. Except from reading the Usrobject one by one, and compare the age value one by one, is there any shortcuts to do so? Thx.

推荐答案

您可以简单地将用户数组映射到用户年龄和查找最大年龄数组:

You can simply map users array to array of user's age and the find max age:

class Usr {
    var age: Int

    init(_ age: Int) {
        self.age = age
    }
}

let users = [Usr(1), Usr(8), Usr(5)]

let maxAge = maxElement(users.map{$0.age}) // 8

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