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go deep copy map

func deepCopyJSON(src map[string]interface{}, dest map[string]interface{}) error {
    if src == nil {
        return errors.New("src is nil. You cannot read from a nil map")
    }
    if dest == nil {
        return errors.New("dest is nil. You cannot insert to a nil map")
    }
    jsonStr, err := json.Marshal(src)
    if err != nil {
        return err
    }
    err = json.Unmarshal(jsonStr, &dest)
    if err != nil {
        return err
    }
    return nil
}

------------------------

How to copy a map to another map?

To copy a map content need to execute a for loop and fetch the index value 1 by 1 with element and assign it to another map. Below is a short example.

package main
 
import (
"fmt"
)
func main() {   
    map1 := map[string]int{ 
        "x":1,
        "y":2,
    }
    map2 := map[string]int{}        
     
    /* Copy Content from Map1 to Map2*/
    for index,element := range map1{        
         map2[index] = element
    }
     
    for index,element := range map2{
        fmt.Println(index,"=>",element)  
    }
}