golang 自定义类型的排序sort

sort包中提供了很多排序算法，对自定义类型进行排序时，只需要实现sort的Interface即可，包括：

func Len() int {... }

func Swap(i, j int) {... }

func Less(i, j int) bool {... }

使用方法举例如下：

package main

import (
    "fmt"
    "sort"
)

type Person struct {
    Name string
    Age  int
}

func (p Person) String() string {
    return fmt.Sprintf("%s: %d", p.Name, p.Age)
}

// ByAge implements sort.Interface for []Person based on
// the Age field.
type ByAge []Person

func (a ByAge) Len() int           { return len(a) }
func (a ByAge) Swap(i, j int)      { a[i], a[j] = a[j], a[i] }
func (a ByAge) Less(i, j int) bool { return a[i].Age < a[j].Age }

func main() {
    people := []Person{
        {"Bob", 31},
        {"John", 42},
        {"Michael", 17},
        {"Jenny", 26},
    }

    fmt.Println(people)
    sort.Sort(ByAge(people))
    fmt.Println(people)
}

Output:

[Bob: 31 John: 42 Michael: 17 Jenny: 26]

[Michael: 17 Jenny: 26 Bob: 31 John: 42]

参考

• go文档

• golang 对自定义类型排序
  
  https://segmentfault.com/a/1190000008062661

• Go语言实战_自定义OrderedMap
  
  https://studygolang.com/articles/7755