从Swift的元组数组项目列

Question

我有一个Swift数组元组Persons = [(name:String, age:Int)]。 现在我想从字符串数组中提取所有不同的名称，name:[String]从Persons数组中提取。我怎么才能得到它。你

Answer 1

let distinctNames = Set(Persons.map { $0.name }) 

Answer 2

小代码示例演示如何使用map功能：

struct Person { 
     let name: String 
     let age: Int 
} 

let people = [ 
    Person(name: "Oleg", age: 24), 
    Person(name: "Igor", age: 26), 
] 

let names: [String] = people.map { return $0.name }