golang 判断更新和删除的数据

不在数据库中的数据则新增 [增量]

all := []string{"a", "b", "c", "d"}
update := []string{"a", "b", "c", "d", "f"}
add:=  []string{"f"}

存在数据库中 不在请求的数据中的数据

all := []string{"a", "b", "c", "d"}
remove := []string{"f", "e"}
diff:= []string{"a", "b", "c", "d"}

请求示例

package main

import (
	"fmt"
	"strings"
)

func main() {
	all := []string{"a", "b", "c", "d"}
	currentMap := sliceToMap(all)

	update := []string{"a", "b", "c", "d", "f"}
	remove := []string{"f", "e"}

	fmt.Println(updateStr(currentMap, update))
	fmt.Println(removeStr(currentMap, remove))

}

func sliceToMap(current []string) map[string]struct{} {
	resMap := make(map[string]struct{})
	for _, s := range current {
		resMap[s] = struct{}{}
	}

	return resMap
}

func updateStr(current map[string]struct{}, all []string) string {
	var resStr []string
	for _, s := range all {
		if _, ok := current[s]; !ok {
			resStr = append(resStr, s)
		}
	}
	return strings.Join(resStr, ",")
}

func removeStr(current map[string]struct{}, all []string) string {
	intersection := make(map[string]struct{})
	for _, s := range all {
		if _, ok := current[s]; ok {
			intersection[s] = struct{}{}
		}
	}

	var resStr []string
	for s, _ := range current {
		if _, ok := intersection[s]; !ok {
			resStr = append(resStr, s)
		}
	}
	return strings.Join(resStr, ",")
}