goalng maps undering the boolean code example

Example 1: dictionary golang

package main

import (
    "fmt"
)

func main() {
    dict := map[interface{}]interface{} {
        1: "hello",
        "hey": 2,
    }
    fmt.Println(dict) // map[1:hello hey:2]
}

Example 2: go get from map

var id string
var ok bool
if x, found := res["strID"]; found {
     if id, ok = x.(string); !ok {
        //do whatever you want to handle errors - this means this wasn't a string
     }
} else {
   //handle error - the map didn't contain this key
}