我試圖理解 Golang 中的嵌套映射。我有一個(gè)像下面這樣的地圖，我如何遍歷所有的鍵？Data: - name: "foo" bar1: 0 k1: val1 k2: val2 val3 bar2: 1 k3: val4 k4: val5 k3: val4 k4: val5
1 回答
慕的地8271018
TA貢獻(xiàn)1796條經(jīng)驗(yàn) 獲得超4個(gè)贊
您必須將數(shù)據(jù)解組到地圖中，(map[interface{}]interface{} 或者map[string]interface{})然后您必須檢查鍵值的類型。您可以使用該yaml.v2包，并且可能有更清晰的接口可以幫助檢測值的類型。否則檢查迭代鍵并打印值的示例：
package main
import (
"fmt"
"gopkg.in/yaml.v2"
"reflect"
"strings"
)
var data = `
Data:
- name: "foo"
bar1: 0
k1: val1
k2:
val2
val3
bar2: 1
k3: val4
k4: val5
k5: val5
k6: val6
`
func printVal(v interface{}, depth int) {
typ := reflect.TypeOf(v).Kind()
if typ == reflect.Int || typ == reflect.String {
fmt.Printf("%s%v\n", strings.Repeat(" ", depth), v)
} else if typ == reflect.Slice {
fmt.Printf("\n")
printSlice(v.([]interface{}), depth+1)
} else if typ == reflect.Map {
fmt.Printf("\n")
printMap(v.(map[interface{}]interface{}), depth+1)
}
}
func printMap(m map[interface{}]interface{}, depth int) {
for k, v := range m {
fmt.Printf("%sKey:%s", strings.Repeat(" ", depth), k.(string))
printVal(v, depth+1)
}
}
func printSlice(slc []interface{}, depth int) {
for _, v := range slc {
printVal(v, depth+1)
}
}
func main() {
m := make(map[string]interface{})
err := yaml.Unmarshal([]byte(data), &m)
if err != nil {
panic(err)
}
for k, v := range m {
fmt.Printf("Key:%s ", k)
printVal(v, 1)
}
}
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