Interface to struct in Go (Golang) - Welcome To Golang By Example

We come around a situation sometimes in programming where an empty interface might a struct internally and we have to get the concrete struct out of it. Whoever is not aware of what an empty interface is should read this excellent article: https://research.swtch.com/interfaces.

For conversion of interface{} to a struct, we will use the library – https://github.com/mitchellh/mapstructure . Let’s understand how to convert the interface to a struct by an example:

package main
import (
"fmt"
"github.com/mitchellh/mapstructure"
)
type NewCustomerEvent struct {
Name string
Phone string
Email string
}
func main() {
newCustomer := NewCustomerEvent{Name: "x", Phone: "082213909101", Email: "[email protected]"}
convert(newCustomer)
}
func convert(event interface{}) {
c := NewCustomerEvent{}
mapstructure.Decode(event, &c)
fmt.Printf("Event is: %v", c)
}

Output:

Event is: {x 082213909101 [email protected]}

convert

interface

struct