我是 galang 的新手，我想用嵌套地圖連接字符串。下面是給出的虛擬代碼，指出我的錯(cuò)誤。提前致謝 import ( "fmt" "strconv" ) func main() { str := "Hello @John martin #sosos &Hi @William " var key string = "" var ku int = 0 var kh int = 0 var kg int = 0 var id string var col string var retMap = make(map[string]map[string]string) retMap[key] = make(map[string]string) for i := 0; i < len(str); i++ { //fmt.Println(string(str[i]), " >> ", str[i]) if str[i] == 64 || str[i] == 35 || str[i] == 38 { if str[i] == 64 { ku++ key = "user" id = strconv.Itoa(ku) } else if str[i] == 35 { kh++ key = "hashTag" id = strconv.Itoa(kh) } else { kg++ key = "group" id = strconv.Itoa(kg) } retMap[key] = make(map[string]string) // If not assign here then it gives runtime error "panic: assignment to entry in nil map" for j := i + 1; j < len(str); j++ { col = col + string(str[j]) if str[j] == 32 { j = len(str) - 1 retMap[key][id] = retMap[key][id] + col col = " " } } } } fmt.Println("Final String ",retMap)}輸出：最終字符串 map[group:map[1: Hi] user:map[2: William] hashTag:map[1: sosos]]預(yù)期輸出：最終字符串 map[group:map[1: Hi] user:map[1: John, 2: William] hashTag:map[1: sosos ]]它可能是重復(fù)的
1 回答
瀟湘沐
TA貢獻(xiàn)1816條經(jīng)驗(yàn) 獲得超6個(gè)贊
問(wèn)題是您正在每個(gè)調(diào)用中初始化“key”的嵌套映射，因此它始終覆蓋以前的數(shù)據(jù)。
所以只需改變你的線路
retMap[key] = make(map[string]string) // If not assign here then it gives runtime error "panic: assignment to entry in nil map"
到下面應(yīng)該使您的代碼工作：
=_, ok := retMap[key]
if !ok {
retMap[key] = make(map[string]string)
}
我只是檢查為“鍵”存儲(chǔ)的值是否存在，如果不存在則初始化一個(gè)新映射。
更新：
我還重寫了您的代碼，以使用 Go 提供的一些內(nèi)置函數(shù)，如strings.Split或strings.Trim*函數(shù)。它可能會(huì)有所幫助。
package main
import (
"fmt"
"strconv"
"strings"
)
const str = "Hello @John martin #sosos &Hi @William "
func main() {
retMap := make(map[string]map[string]string)
retMap["group"] = make(map[string]string)
retMap["user"] = make(map[string]string)
retMap["hashTag"] = make(map[string]string)
list := strings.Split(strings.TrimSpace(str), " ")
for _, value := range list {
firstCharacter := string(value[0])
if firstCharacter == "@" {
retMap["user"][strconv.Itoa(len(retMap["user"])+1)] = strings.TrimLeft(value, "@")
} else if firstCharacter == "&" {
retMap["group"][strconv.Itoa(len(retMap["group"])+1)] = strings.TrimLeft(value, "&")
} else if firstCharacter == "#" {
retMap["hashTag"][strconv.Itoa(len(retMap["hashTag"])+1)] = strings.TrimLeft(value, "#")
}
}
fmt.Println("Final String ", retMap)
}
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