我在使用Go的Struct中遇到问题。
示例代码:
package main
import (
"fmt"
)
type KeyVal struct {
Key interface{}
Value interface{}
}
type KeyVals []KeyVal
func (kvs *KeyVals) AddOld(key interface{}, val interface{}) {
kv := KeyVal{key, val,typ}
*kvs = append(*kvs, kv)
}
func (kvs *KeyVals) Add(key interface{}, val interface{}){
var flag,id = kvs.Exist(key)
if flag == true {
//kv := KeyVal{key,"Updated!"}
//*kvs=append(*kvs,kv)
//fmt.Println(*kvs[0].Key)
//update value of them
kv := KeyVal{key,val}
kvs[id]=kv
//*kvs[id]=kv
//fmt.Println("old set with id =",id,",","value =",kvs)
}else{
kv := KeyVal{key, val}
*kvs = append(*kvs, kv)
}
}
func (kvs *KeyVals) Search(skey interface{}) (bool,interface{},interface{}) {
for n, kv := range *kvs {
key := kv.Key
val := kv.Value
if(key == skey){
return true,n,val
}
}
return false,nil,nil
}
func (kvs *KeyVals) Exist(skey interface{})(bool,int) {
for n, kv := range *kvs {
key := kv.Key
if(key == skey){
return true,n
}
}
return false,-1
}
func main() {
var kvs keyval.KeyVals
kvs.Add("key1","value1")
kvs.Add("key2","value2")
kvs.Add("key3","value3")
kvs.Add("key4",5)
kvs.Add("key5",5.2)
kvs.Add("key5","new....")//this should update value of this key. but not work!
var flag,id,value = kvs.Search("key5")
fmt.Println(flag,id,value)
for _, kv := range kvs {
key := kv.Key
val := kv.Value
fmt.Println("", key," ==> ", val)
}
}
我的问题:
函数Add()中的
kvs[id]=kv
有错误!如何解决? Exist()
的Search()
更改为:意思是:type KeyVals []KeyVal
或type KeyVals [interface{}]KeyVal
...但是出错! 最佳答案
1。在函数Add()中,kvs [id] = kv有错误!如何解决? kvs
是* KeyVals类型,它不支持索引
您可以使用
(*kvs)[id] = kv
2。 Exist()和Search()的速度好吗?不能变得更好?
您可以使用哈希图而不是数组来实现更快的搜索/存在功能。您可以将
search
和exist
组合为一个功能。3。我尝试在代码中添加索引名称:将KeyVals [] KeyVal更改为:意思是:键入KeyVals [interface {}] KeyVal或键入KeyVals [string] KeyVal ...但出错!
类型声明是错误的,更接近的类型是
map[interface{}]interface{}
或map [string]interface{}
这是有效的更新代码,我使用了Hashmap而不是array来跟踪顺序
代码
package main
import (
"fmt"
)
type KeyVals struct {
keyVals map[string]interface{}
KeysInOrder []string
}
func (kvs *KeyVals) Add(key string, val interface{}) {
if kvs.keyVals == nil {
kvs.keyVals = make(map[string]interface{})
}
if _, ok := kvs.keyVals[key]; ok {
kvs.keyVals[key] = val
return
}
kvs.keyVals[key] = val
kvs.KeysInOrder = append(kvs.KeysInOrder, key)
return
}
func (kvs KeyVals) Search(key string) (interface{}, bool) {
val, found := kvs.keyVals[key]
return val, found
}
func main() {
var kvs KeyVals
kvs.Add("key1", "value1")
kvs.Add("key2", "value2")
kvs.Add("key3", "value3")
kvs.Add("key4", 5)
kvs.Add("key5", 5.2)
kvs.Add("key5", "new....") //this should update value of this key. but not work!
value, ok := kvs.Search("key5")
fmt.Println(value, ok)
for _, key := range kvs.KeysInOrder {
value, _ = kvs.Search(key)
fmt.Println(key, " ==> ", value)
}
}
这是播放链接:link
关于dictionary - 如何使用Go修复Struct中的Issue?,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/42039921/