泛型函数根据属性对类的数组进行排序 [英] Generic function to sort array of class by properties
本文介绍了泛型函数根据属性对类的数组进行排序的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
例如,我有这些类
public class Car {
var id:Int
var制造商:字符串
var变量:字符串
init(id:Int,manufacturer:String,variant:String){
self.id = id
self.manufacturer =制造商
self.variant =变量
}
}
enum性别{b $ b案例男性
案例女性
}
公共类人员{
var id:Int
var name:String
var age:Int
var性别:Gender
init(id:Int,name:String,age:Int,性别:性别){
self.id = id
self.name =姓名
self.age =年龄
self.gender =性别
}
}
而这些数组,
let cars = [
Car(id:1,manufa汽车(编号:2,制造商:日产,变体:天际线),
汽车(id:3,制造商:道奇 ,变型:充电器),
汽车(id:4,制造商:雪佛兰,变体:Camaro),
汽车(id:5,制造商:福特 Shelby)
]
let persons = [
Person(id:1,name:Ed Sheeran,年龄:26,性别:男),
Person(id:2,姓名:Phil Collins,年龄:66,性别:.male),
Person(id:3,姓名:夏奇拉,年龄:40,性别: ,
Person(id:4,name:Rihanna,年龄:25,性别:.female),
Person(id:5,name:Bono,年龄:57,性别:男)
]
如何为数组写一个通用扩展,关于财产传递? (例如persons.sort(姓名)或cars.sort(制造商))
谢谢!
解决方案
扩展数组{
mutating func propertySort< T:比较>(_财产:(元素) - > T){
sort(by:{property($ 0)< property($ 1)})
}
}
用法:
persons.propertySort({$ 0.name})
这里是一个非变异版本:
func propertySorted< T:Comparable>(_ property:(Element) - > T) - > [元素] {
返回排序(通过:{property($ 0)< property($ 1)})
}
I want to create a generic function to sort an array of classes based on a property passed.
For example, I have these classes
public class Car {
var id: Int
var manufacturer: String
var variant: String
init(id: Int, manufacturer: String, variant: String) {
self.id = id
self.manufacturer = manufacturer
self.variant = variant
}
}
enum Gender {
case male
case female
}
public class Person {
var id: Int
var name: String
var age: Int
var gender: Gender
init(id: Int, name: String, age: Int, gender: Gender) {
self.id = id
self.name = name
self.age = age
self.gender = gender
}
}
And these arrays,
let cars = [
Car(id: 1, manufacturer: "Ford", variant: "Focus"),
Car(id: 2, manufacturer: "Nissan", variant: "Skyline"),
Car(id: 3, manufacturer: "Dodge", variant: "Charger"),
Car(id: 4, manufacturer: "Chevrolet", variant: "Camaro"),
Car(id: 5, manufacturer: "Ford", variant: "Shelby")
]
let persons = [
Person(id: 1, name: "Ed Sheeran", age: 26, gender: .male),
Person(id: 2, name: "Phil Collins", age: 66, gender: .male),
Person(id: 3, name: "Shakira", age: 40, gender: .female),
Person(id: 4, name: "Rihanna", age: 25, gender: .female),
Person(id: 5, name: "Bono", age: 57, gender: .male)
]
How to write a generic extension for the array, to sort it based on the property passed? (eg. persons.sort(name) or cars.sort(manufacturer))
Thanks!
解决方案
Here you go:
extension Array {
mutating func propertySort<T: Comparable>(_ property: (Element) -> T) {
sort(by: { property($0) < property($1) })
}
}
Usage:
persons.propertySort({$0.name})
And here is a non-mutating version:
func propertySorted<T: Comparable>(_ property: (Element) -> T) -> [Element] {
return sorted(by: {property($0) < property($1)})
}
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