Convert map[interface {}]interface {} to map[string]string

Question

From a source I cannot influence I am given data in a map, which arrives as map[interface {}]interface {}.

I need to process the contained data, preferably as map[string]string (the data within is perfectly suitable for that).

I need to generate a list of the keys from the data as well, as those are not known beforehand.

Most similar questions I could find on the web say more or less, that this is impossible, but if my map is m, fmt.Println(m) shows the data is there, readable as map[k0:v0 K1:v1 k2:v2 ... ].

How can I do what fmt.Println is able to do?

Answer 1

A secure way to process unknown interfaces, just use fmt.Sprintf()

https://play.golang.org/p/gOiyD4KpQGz

package main  import (     "fmt" )  func main() {      mapInterface := make(map[interface{}]interface{})        mapString := make(map[string]string)      mapInterface["k1"] = 1     mapInterface[3] = "hello"     mapInterface["world"] = 1.05      for key, value := range mapInterface {         strKey := fmt.Sprintf("%v", key)         strValue := fmt.Sprintf("%v", value)          mapString[strKey] = strValue     }      fmt.Printf("%#v", mapString) }