作为对象的数组元素之一

Question

The question is how to get the "from" element? The rest is not a problem

I know that in https://github.com/json-iterator/ it can be done, but I could not figure out how it works there

Json:

{
  "ab": 123456789,
  "cd": [
    [
      4,
      1234,
      123456,
      1000000001,
      1234567890,
      "text",
      {
        "from": "123456"
      }
    ],
    [
      4,
      4321,
      654321,
      1000000001,
      9876543210,
      "text",
      {
        "from": "654321"
      }
    ]
  ]
}

Golang:

type test struct {
    Ab int             `json:"ab"`
    Cd [][]interface{} `json:"cd"`
}
var testvar test
json.Unmarshal(Data, &testvar)
testvar.Cd[0][6]["from"].(string)

Error:

invalid operation: testvar.Cd[0][6]["from"] (type interface {} does not support indexing)

Answer 1

It's simple: it is a map[string]interface{} hence

m, ok := testvar.Cd[0][6].(map[string]interface{})

fmt.Println(m, ok, m["from"])

https://play.golang.org/p/XJGs_HsxMfZ