将对象数组映射到Swift中的Dictionary [英] Map array of objects to Dictionary in Swift

问题描述

我有一个 Person 的对象数组：

class Person {
   let name:String
   let position:Int
}

，数组是：

let myArray = [p1,p1,p3]

我想将 myArray 映射为的字典[position：name] 经典的解决方案是：

I want to map myArray to be a Dictionary of [position:name] the classic solution is:

var myDictionary =  [Int:String]()

for person in myArray {
    myDictionary[person.position] = person.name
}

Swift是否有任何优雅的方式使用功能方法 map ， flatMap ...或其他现代Swift风格

is there any elegant way by Swift to do that with the functional approach map, flatMap... or other modern Swift style

推荐答案

好的地图不是一个很好的例子，因为它与循环一样，你可以使用 reduce 来代替你将每个对象组合起来并转化为单个值：

Okay map is not a good example of this, because its just same as looping, you can use reduce instead, it took each of your object to combine and turn into single value:

let myDictionary = myArray.reduce([Int: String]()) { (dict, person) -> [Int: String] in
    var dict = dict
    dict[person.position] = person.name
    return dict
}

//[2: "b", 3: "c", 1: "a"]

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