Mastering Go - Second Edition

The reflectwalk library

The reflectwalk library allows you to walk complex values in Go using reflection in a way that is similar to the way you walk a filesystem. The following example, which is going to walk a structure, is called walkRef.go and it is going to be presented in five parts.

The first part of walkRef.go is as follows:

package main 
 
import ( 
    "fmt" 
    "github.com/mitchellh/reflectwalk" 
    "reflect" 
) 
 
type Values struct { 
    Extra map[string]string 
} 

As reflectwalk is not a standard Go package, you will need to call it using its full address.

The second part of walkRef.go is as follows:

type WalkMap struct { MapVal reflect.Value Keys map[string]bool Values map[string]bool } func (t *WalkMap) Map(m reflect.Value) error { t.MapVal = m return ...