golang将切片或数组进行分组

例子一：

golang 数组分割

需求：给定一个数组和一个正整数，要求把数组分割成多个正整数大小的数组，如果不够分，则最后一个数组分到剩余的所有元素。

package main

import (
	"fmt"
)

func main() {
	//demo01()
	//demo02()
	demo03()
}

func demo01()  {
	arr := []int{1, 2, 3, 4, 5, 6, 7, 8, 9,10}
	fmt.Println(arr) //[1 2 3 4 5 6 7 8 9 10]

	res:= ArrayInGroupsOf(arr,2) //[[1 2] [3 4] [5 6] [7 8] [9 10]]

	fmt.Println(res)
}

func demo02()  {
	arr := [][]string{{"1", "2"},{"3", "4"},{"5", "6"},{"7", "8"},{"9","10"}}
	fmt.Println(arr) //[[1 2] [3 4] [5 6] [7 8] [9 10]]
	res:= ArrayTwoStringGroupsOf(arr,5) //[[[1 2] [3 4]] [[5 6] [7 8]] [[9 10]]]
	fmt.Printf("%+v",res)
}

type student struct {
	name string
	age  int
}
func demo03()  {
	stus := []student{
		{name: "小王子", age: 18},
		{name: "娜扎", age: 23},
		{name: "大王八", age: 9000},
		{name: "大王八1", age: 9000},
		{name: "大王八2", age: 9000},
		{name: "大王八3", age: 9000},
		{name: "大王八4", age: 9000},
	}
	fmt.Printf("%+v\n",stus)
	//[{name:小王子 age:18} {name:娜扎 age:23} {name:大王八 age:9000} {name:大王八1 age:9000} {name:大王八2 age:9000} {name:大王八3 age:9000} {name:大王八4 age:9000}]

	res:= ArrayStruGroupsOf(stus,3) //[[[1 2] [3 4]] [[5 6] [7 8]] [[9 10]]]
	fmt.Printf("%+v\n",res)
	//[[{name:小王子 age:18} {name:娜扎 age:23} {name:大王八 age:9000}] [{name:大王八1 age:9000} {name:大王八2 age:9000} {name:大王八3 age:9000}] [{name:大王八4 age:9000}]]

}

/*
示例3：
数组：[{name:小王子 age:18} {name:娜扎 age:23} {name:大王八 age:9000} {name:大王八1 age:9000} {name:大王八2 age:9000} {name:大王八3 age:9000} {name:大王八4 age:9000}]，正整数：2
期望结果: [[{name:小王子 age:18} {name:娜扎 age:23} {name:大王八 age:9000}] [{name:大王八1 age:9000} {name:大王八2 age:9000} {name:大王八3 age:9000}] [{name:大王八4 age:9000}]]
调用: res:= arrayStruGroupsOf(arr,2)
*/
func ArrayStruGroupsOf(stu []student, num int64) [][]student {
	max := int64(len(stu))
	//判断数组大小是否小于等于指定分割大小的值，是则把原数组放入二维数组返回
	if max <= num {
		return [][]student{stu}
	}
	//获取应该数组分割为多少份
	var quantity int64
	if max%num == 0 {
		quantity = max / num
	} else {
		quantity = (max / num) + 1
	}
	//声明分割好的二维数组
	var segments = make([][]student, 0)
	//声明分割数组的截止下标
	var start, end, i int64
	for i = 1; i <= quantity; i++ {
		end = i * num
		if i != quantity {
			segments = append(segments, stu[start:end])
		} else {
			segments = append(segments, stu[start:])
		}
		start = i * num
	}
	return segments
}

/*
示例1：
数组：[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]，正整数：2
期望结果: [[1, 2], [3, 4], [5, 6], [7, 8], [9, 10]]
调用: res:= arrayInGroupsOf(arr,2)
*/
func ArrayInGroupsOf(arr []int, num int64) [][]int {
	max := int64(len(arr))
	//判断数组大小是否小于等于指定分割大小的值，是则把原数组放入二维数组返回
	if max <= num {
		return [][]int{arr}
	}
	//获取应该数组分割为多少份
	var quantity int64
	if max%num == 0 {
		quantity = max / num
	} else {
		quantity = (max / num) + 1
	}
	//声明分割好的二维数组
	var segments = make([][]int, 0)
	//声明分割数组的截止下标
	var start, end, i int64
	for i = 1; i <= quantity; i++ {
		end = i * num
		if i != quantity {
			segments = append(segments, arr[start:end])
		} else {
			segments = append(segments, arr[start:])
		}
		start = i * num
	}
	return segments
}

/*
示例2：
数组：[[1 2] [3 4] [5 6] [7 8] [9 10]]，正整数：2
期望结果: [[[1 2] [3 4]] [[5 6] [7 8]] [[9 10]]]
调用: res:= arrayTwoStringGroupsOf(arr,2)
*/
func ArrayTwoStringGroupsOf(arr [][]string, num int64) [][][]string {
	max := int64(len(arr))
	//判断数组大小是否小于等于指定分割大小的值，是则把原数组放入二维数组返回
	if max <= num {
		return [][][]string{arr}
	}
	//获取应该数组分割为多少份
	var quantity int64
	if max%num == 0 {
		quantity = max / num
	} else {
		quantity = (max / num) + 1
	}
	//声明分割好的二维数组
	var segments = make([][][]string, 0)
	//声明分割数组的截止下标
	var start, end, i int64
	for i = 1; i <= quantity; i++ {
		end = i * num
		if i != quantity {
			segments = append(segments, arr[start:end])
		} else {
			segments = append(segments, arr[start:])
		}
		start = i * num
	}
	return segments
}

原文链接：https://blog.csdn.net/MCJPAO/article/details/108431657

例子二

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
}

输出：

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}]]