我想打印一个复杂的数据集,如下面的
package main
import (
"fmt"
// "reflect"
)
func main() {
var initData []interface{}
initData[0] = map[string]interface{}{
"name": "k1",
"type": "line",
"data": []int{1, 2, 3, 4},
}
initData[1] = map[string]interface{}{
"name": "k2",
"type": "circle",
"data": []int{11, 12, 13, 14},
}
for _, data := range initData {
for k, v := range data {
fmt.Println(k)
for _, sv := range v {
fmt.Println(" " + sv)
}
}
}
}
但收到错误
./maps-in-maps.go:56: cannot range over data (type interface {})
任何帮助?尝试将界面类型化数据集与arry或slice
等可整合对齐答案 0 :(得分:4)
您必须首先键入断言每个interface{}
级别,在这种情况下,在map[string]interface{}
级别使用类型断言,因为我们知道明确的类型,并且键入开关以检查下一级别中每个嵌套值的预期类型。
initData := []interface{}{
map[string]interface{}{
"name": "k1",
"type": "line",
"data": []int{1, 2, 3, 4},
},
map[string]interface{}{
"name": "k2",
"type": "circle",
"data": []int{11, 12, 13, 14},
},
}
for _, data := range initData {
for _, v := range data.(map[string]interface{}) {
switch t := v.(type) {
case string, []int:
fmt.Println(t)
default:
fmt.Println("wrong type")
}
}
}
}
运行playground here。