如何修改结构的嵌套数组的值

Question

主代码

我的结构如下：

package main
import (
"fmt"
)
func main() {
s := Stats{}
s.initStructs()
s.Update()
fmt.Println(s)
}
type Stats struct {
Languages []Language
}
type Language struct {
Name       string
Mentions   int
Frameworks []Framework
}
type Framework struct {
Name     string
Mentions int
Sources  []string
}
func (s *Stats) Update() {
for _, pl := range s.Languages {
pl.Mentions++
for _, fm := range pl.Frameworks {
fm.Mentions++
}
}
}
func (s *Stats) initStructs() {
techs := map[string][]string{
"python":     {"flask", "django", "tensorflow", "pytorch"},
"javascript": {"angular", "typescript", "node", "express", "react", "vue", "socket.io"},
"c#":         {"asp.net", "unity", ".net"},
"php":        {"laravel"},
"markup":     {"html", "css", "scss"},
"java":       {"spring", "oracle", "grails", "kotlin", "android"},
"sql":        {"postgre", "mongo", "mysql"},
"c++":        {"unity"}}
for item := range techs {
planguage := Language{Name: item}
for _, i := range techs[item] {
f := Framework{Name: i}
planguage.Frameworks = append(planguage.Frameworks, f)
}
s.Languages = append(s.Languages, planguage)
}
}

我有一个initStructs((方法，用于Stats生成类似的嵌套结构

｛〔｛python 0〔｛flask 0〔〕｝｛django 0〔〕〕｝{tensorflow 0〔〕}｛pytorch 0〔〕]｝｝{javascript 0〔｛angular 0〔…

但是，问题是，每当我试图用update((方法更新嵌套结构的值时，它都不起作用，这些值就不会被更新。

我确实意识到我需要使用指针，但不确定如何使用。

Answer 1

当您循环遍历数组的元素时，循环变量是该元素的副本。因此，更新是在副本上完成的，而不是在结构本身上。改为使用索引：

func (s *Stats) Update() {
for i := range s.Languages {
s.Languages[i].Mentions++
for j := range s.Languages[i].Frameworks {
s.Languages[i].Frameworks[j].Mentions++
}
}
}