golang将切片或数组根据某个字段进行分组

package main

import (
	"fmt"
	"sort"
)

type Person struct {
	Name string
	Age int
}

func main() {
	p1 := Person{"Tom",20}
	p2 := Person{"Lily",21}
	p3 := Person{"Linda",23}
	p4 := Person{"Jass",25}
	p5 := Person{"Tonny",20}
	p6 := Person{"Pite",25}
	p7 := Person{"Paul",21}
	p8 := Person{"Kriss",27}
	p9 := Person{"Jake",23}
	p10 := Person{"Rose",20}

	personList := []Person{}
	personList = append(personList,p1,p2,p3,p4,p5,p6,p7,p8,p9,p10)
	fmt.Println("分组前的数据:",personList)
	fmt.Println("分组后的数据:",splitSlice(personList))
}

//按某个字段排序
type sortByAge []Person

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



//切片分组
func splitSlice(list []Person)  [][]Person {
	sort.Sort(sortByAge(list))
	returnData := make([][]Person,0)
	i:= 0
	var j int
	for {
		if i >= len(list) {
			break
		}
		for j = i + 1; j< len(list) && list[i].Age == list [j].Age; j++ {}

		returnData = append(returnData,list[i:j])
		i = j
	}
	return returnData
}

打印结果如下：分组前的数据: [{Tom 20} {Lily 21} {Linda 23} {Jass 25} {Tonny 20} {Pite 25} {Paul 21} {Kriss 27} {Jake 23} {Rose 20}]

分组后的数据: [[{Tom 20} {Rose 20} {Tonny 20}] [{Lily 21} {Paul 21}] [{Linda 23} {Jake 23}] [{Pite 25} {Jass 25}][{Kriss 27}]]