将map [interface {}] interface {}转换为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)
}